May 7, 2026 • 42 mins
We follow the trail from DNA methylation to epigenetic clocks that can read biological age like a personalized receipt of your life. Then we hit the hard limits of today’s tests, especially the gap between predicting lifespan and predicting whether your brain stays sharp.
• DNA methylation as gene control through steric hindrance and chromatin tightening
• Epigenetic clocks built from predictable CpG changes over time
• Why first-generation clocks track birthdays more than health
• PhenoAge and GrimAge as decay predictors tied to inflammation and smoking damage
• French centenarian data showing biological ages decades younger
• Epigenetic drift versus clock-like methylation changes and what superagers reveal
• ELOVL2 and mouse evidence that some aging is reversible gene silencing
• WIMS findings showing blood clocks predict survival not dementia risk
• APOE E2 E3 E4 risk differences and epigenetic “volume dial” control
• FOXO3 activation through fasting via IGF-1 and AKT signaling
• Metformin and rapamycin as fasting mimetics plus the mouse-to-primate reality check
Keep your biological software updated, embrace a little bit of hunger, stay curious, and we'll see you next time.
This podcast is created by Ai for educational and entertainment purposes only and does not constitute professional medical or health advice. Please talk to your healthcare team for medical advice.
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Episode Transcript
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SPEAKER_01 (00:00):
So what if I told you that uh there's a
105-year-old French womansitting in a cafe right now
sipping espresso and she has theexact identical cellular
machinery of a 75-year-old.
Like biologically, she hassomehow just lived 30 years
completely off the grid.
SPEAKER_00 (00:17):
Well, I I would push back slightly on that phrase,
the whole off the grid thing,because the entire point of the
data we're looking at today isthat your cells are actually
always keeping a grid.
Like they're keeping afrighteningly accurate, totally
individualized receipt ofabsolutely everything you do.
But I mean, your premise isessentially correct.
The chronological clock on thewall and the biological clock
(00:37):
inside her cells are running atcompletely different speeds.
SPEAKER_01 (00:40):
Aaron Powell Dude, it is wild.
Because today's deep dive isinto the fascinating and
honestly sort of terrifyingscience of measuring and
manipulating biological aging.
We are not just talking about,you know, getting wrinkles or
gray hair here.
We are talking about literalbiological time travel.
SPEAKER_00 (00:55):
Aaron Powell Yes.
And we have a massive stack ofsources for this cutting-edge
research covering things likeepigenetic clock, centenary and
DNA, uh this huge project calledthe WIMS Study on Brain Aging.
SPEAKER_01 (01:07):
Oh man, that one messed me up.
SPEAKER_00 (01:08):
It's sobering.
And we'll get into the exactmolecular switches inside you
right now, like APOE and FOC XO3that dictate how long you live,
and more importantly, how wellyou live.
SPEAKER_01 (01:20):
Aaron Ross Powell Exactly.
And that is uh that's ourmission for you today.
We want to figure out why somepeople are biologically decades
younger than what their birthcertificates say.
We're gonna unpack how lifestylechanges actually like physically
rewrite your DNA's destiny.
So I want you to think aboutyour own biological age right
now as you're listening.
Right.
Think about the number ofcandles on your last birthday
(01:41):
cake, and then ask yourselfwhat's actually happening under
the hood.
SPEAKER_00 (01:43):
Aaron Powell Because before we can even begin to talk
about stopping aging or uhhacking the aging process, as
people like to say, we reallyhave to understand how the body
physically measures it.
We have to talk about theepigenome.
SPEAKER_01 (01:55):
Aaron Powell Right.
And I think most people, youknow, anyone who follows health
science understands the basicconcept of DNA, right?
It's the blueprint, it's thehardware of your computer,
you're born with it, itbasically doesn't change.
Correct.
But the epigenome is like thesoftware.
So walk us through the actualphysical mechanism here.
What is this epigenetic softwareactually made of?
SPEAKER_00 (02:15):
Right.
So at the molecular core of allthis is a process called DNA
methylation.
And chemically, it isbeautifully simple.
It's just the addition of a tinymolecule called a methyl group.
SPEAKER_01 (02:25):
Which is what, exactly?
SPEAKER_00 (02:26):
That is just one carbon atom bonded to three
hydrogen atoms.
So CH3.
Your body basically takes thistiny methyl group and attaches
it directly onto the DNA strand,specifically at places where a
cytosine base sits right next toa guanine base.
We call these spots CPGdinucleotides.
SPEAKER_01 (02:43):
Wait, wait, so when we talk about genes turning on
or off, the CH3 thing is theactual physical switch.
How does slapping a carbon andthree hydrogens onto the DNA
actually stop a gene fromworking?
Like, does it just get in theway?
SPEAKER_00 (02:56):
That is exactly what it does.
It's a concept called sterichindrance.
Imagine your DNA as a massive,tightly coiled ball of string.
That's chromatin.
SPEAKER_01 (03:07):
Okay, I'm with you.
SPEAKER_00 (03:08):
For a gene to be expressed, the cellular
machinery, meaning thetranscription factors, they have
to physically land on the DNAstrand and read the code.
When you attach these bulkymethyl groups to the DNA, they
literally take up physicalspace.
They just block thetranscription machinery from
landing.
SPEAKER_01 (03:24):
Oh wow.
So it's literally like putting aphysical padlock on a door.
SPEAKER_00 (03:28):
Precisely.
And it actually goes even deeperthan that.
These methyl groups also attractother proteins that essentially
spool the DNA even tighter,winding it up so densely that
the gene is completelyinaccessible.
It's totally silenced.
Now, for most of your life, thisis highly systematic and
necessary.
Why?
Well, your body uses methylationto ensure an eye cell stays in
(03:48):
eye cell and doesn't suddenlystart, you know, producing
stomach acid.
SPEAKER_01 (03:52):
Right, which would be terrible.
An eyeball full of acid, nothanks.
SPEAKER_00 (03:55):
Highly problematic, yes.
But as we age, the pattern ofthis methylation changes.
It shifts.
Some areas that are supposed tobe active get hypermethylated,
meaning they get locked up.
Meanwhile, other areas actuallylose their methyl groups and get
inappropriately turned on.
SPEAKER_01 (04:11):
Okay, so this software program is basically
slowly getting buggier andbuggier over time.
But what blew my mind in thesesources is that this buggy
degradation isn't just likerandom chaos.
It's so predictable thatscientists figured out how to
build clocks out of it.
SPEAKER_00 (04:26):
Yes.
Nearly a decade ago, scientists,notably Steve Horvath, realized
that a large number of these CPGsites change their methylation
status over time with justastonishing mathematical
predictability.
SPEAKER_01 (04:39):
Like clockwork.
SPEAKER_00 (04:40):
Literally, if you look at enough of these specific
sites across the genome, you cancalculate a highly accurate age
for that tissue.
These are epigenetic clocks.
SPEAKER_01 (04:47):
Right.
The original Horvath clock.
But I mean, looking at theliterature, that first
generation clock was basicallyjust a biological party trick,
wasn't it?
SPEAKER_00 (04:54):
A party trick is a bit harsh, but I see your point.
SPEAKER_01 (04:57):
I mean, it looks at your DNA and says, yep, this
person has been alive for 45years.
Which is cool for forensics.
Like uh if you find a blood dropat a crime scene, but it doesn't
tell you anything about howhealthy that 45-year-old
actually is.
SPEAKER_00 (05:10):
Aaron Powell Exactly.
The first generationchronological clocks were
trained entirely onchronological age.
They were designed to predicttime since birth.
But the field quickly realizedthe limitation there.
I mean, if you and I are bothexactly 40 years old
chronologically, we're nothypothetically.
If we're both 40, but you smokea pack a day and sleep three
(05:32):
hours a night, and I runmarathons and eat a perfectly
balanced Mediterranean diet, ourbiological ages should look
completely different.
SPEAKER_01 (05:39):
Obviously.
SPEAKER_00 (05:40):
But a chronological pluck would just say we're both
40.
SPEAKER_01 (05:42):
Right.
Which brings us to the secondgeneration, the biological
clocks.
SPEAKER_00 (05:46):
Correct.
Clocks like phenynoage andgrimmage.
And these were revolutionarybecause instead of being trained
to predict your birthday, theywere trained to predict your
physiological decay.
Phenoage, for instance, wasn'tjust built on age data.
It was trained using 10 specificclinical markers of
physiological breakdown, thingslike white blood cell count,
albumin levels, and C reactiveprotein, which is a major marker
(06:10):
of systemic inflammation.
SPEAKER_01 (06:11):
So it's looking at the methylation patterns on your
DNA and correlating them withthe actual physical breakdown of
your organs in real time.
SPEAKER_00 (06:19):
Yes.
It looks for the epigeneticsignature of inflammation and
organ dysfunction.
But then the field went a stepfurther with grimmage.
SPEAKER_01 (06:27):
Grimmage, which honestly sounds like a super
villain name or like a terriblemedieval disease.
SPEAKER_00 (06:33):
It is aptly named, honestly, because grimmage is an
extraordinarily accuratepredictor of mortality.
It uses plasma proteins, butcrucially it uses a metric
called smoking pack years totrain its model.
SPEAKER_01 (06:44):
Okay, hold on.
This part of the researchstopped me in my tracks because
they train this DNA clock usingsmoking data.
Like how many cigarettes aperson has smoked?
How does your DNA, how do theselittle CH3 methyl groups know
how many cigarettes you'vesmoked?
SPEAKER_00 (06:58):
Because of the profound systemic impact of the
toxins in tobacco smoke.
When you inhale those chemicals,they trigger massive cellular
stress responses, inflammation,and DNA damage throughout your
entire body.
Right.
Your body responds to thisconstant assault by aggressively
altering its epigeneticsoftware.
It methylates and demethylatesspecific genes to try and manage
(07:19):
that damage.
SPEAKER_01 (07:20):
And Grimmage just reads that damage pattern.
SPEAKER_00 (07:22):
It relies on what we call DNA surrogate biomarkers.
The epigenetic signature ofsmoking is so specific, so
deeply etched into your DNAmethylation patterns, that
Grimmage can look at a bloodsample and calculate your
smoking history with terrifyingprecision.
SPEAKER_01 (07:38):
Dude.
SPEAKER_00 (07:38):
You could sit in your doctor's office and lie,
swearing you quit a decade ago,but Grimmage knows your blood
will completely snitch on you.
SPEAKER_01 (07:45):
That is insane.
Life insurance companies must bedrooling over this tech.
You just can't fake it.
Your cells literally keep thereceipts.
SPEAKER_00 (07:51):
They really do.
Yeah.
And that is why Grimmageoutperforms almost every other
metric in predicting all-causemortality, time to cancer, and
cardiovascular disease.
It captures the true biologicaltoll of your lifestyle choices,
written directly onto yourgenome.
SPEAKER_01 (08:06):
Okay.
So if Grimmage and Finimage arebasically the grim reapers of
predictive biology, you know,reading the decay of our
software, it naturally makes youwonder what happens when you
test people who just absolutelyrefuse to decay.
SPEAKER_00 (08:20):
You were talking about the long-lived
individuals, the extremesuperagers.
SPEAKER_01 (08:24):
Yes, the time travelers.
Because if Grimitz predictsdeath, what does it show when
you test a 105-year-old who islike still taking daily walks
and living completelyindependently?
This brings us to that massiveFrench study in our sources.
And the data here is, I mean, itcompletely breaks the standard
model of aging.
SPEAKER_00 (08:42):
Aaron Powell It is a remarkable cohort.
They analyze French centenariansand semi-supercentenarians,
we'll call them the CSSC group,ranging from 100 to 107 years of
age.
Yeah.
What's crucial here is themethodology.
SPEAKER_01 (08:52):
Okay, break it down.
SPEAKER_00 (08:53):
Instead of using a clock like Horvath's that looks
at hundreds of CPG sites, theytested these superagers using
highly specific epigeneticclocks based on a very small,
tightly curated number of CPGsites.
We're talking just two to foursites total.
SPEAKER_01 (09:09):
Which is fascinating in itself.
They zoomed all the way in onjust a tiny handful of these
molecular padlocks, and what didthey find?
The numbers just blew me away.
SPEAKER_00 (09:17):
The epigenetic clocks calculated their
biological age to be between 15and 28.5 years younger than
their actual chronological age.
SPEAKER_01 (09:25):
I mean, let that sink in for a second if you're
listening to this.
You are 105 years old on paper.
You were born before commercialradio even existed.
But the cellular methylationprofile of your body looks like
someone in their late 70s.
That is biologically cheatingdeaf.
SPEAKER_00 (09:40):
It is a profound deceleration of the aging
process.
And significantly, they found asimilar, though slightly less
extreme, effect in the offspringof these centenarians.
The non-ingenarian andcentenarian offspring, the NCO
group, they were biologically 4to 11.5 years younger than their
chronological age.
SPEAKER_01 (09:57):
So it's heritable.
They literally passed down thisincredibly resilient software to
their kids.
But why?
What makes their methylationpatterns so impossibly stable?
When I was looking through thebreakdown of the study, there
was this really interestingdistinction between the
epigenetic clock and epigeneticdrift.
SPEAKER_00 (10:15):
This is a vital mechanical distinction in
longevity science.
We've been talking aboutepigenetic clocks, the
predictable systematic ticking.
Yeah.
Certain genes gain or losemethyl groups at a very steady
rate across the entire humanpopulation.
That is the clock.
Right.
But epigenetic drift is entirelydifferent.
Drift is the random chaoticscattering of methylation over
(10:37):
time.
SPEAKER_01 (10:37):
Okay, so if the clock is a highly precise
metronome keeping the temple ofaging, the drift is like the
individual members of theorchestra slowly getting out of
tune, hitting random notes untilthe whole symphony just sounds
like garbage.
SPEAKER_00 (10:49):
That is exceptionally good analogy,
actually.
Drift is the cumulative effectof stochastic or random
environmental factors.
Every minor cellular stressor,every minor inflammatory event
over a lifetime adds a tiny bitof noise to the epigenome.
SPEAKER_01 (11:03):
Give me an example of that.
SPEAKER_00 (11:04):
Well, identical twins are born with identical
meshillation patterns, but bythe time they're 75, their
epigenomes have driftedsignificantly apart purely
because they experienceddifferent random environmental
exposures, different diets,different stress, different
illnesses.
SPEAKER_01 (11:19):
Okay, so the orchestra gets out of tune for
everyone.
But what did the French studyshow about these 105-year-olds?
SPEAKER_00 (11:25):
This is where it gets highly technical, but
incredibly revealing.
They looked at the dispersion ofmethylation values, the variance
at these specific CPG sites.
For some sites, the epigeneticdrift was massively accelerated,
but only in the extremesuperagers.
SPEAKER_01 (11:39):
Wait, I want to make sure I understand this.
You're saying that normalpeople, people who die at 80 or
85, they literally don't livelong enough to even experience
this specific type of epigeneticnoise.
SPEAKER_00 (11:50):
Exactly.
The drift at these specific locionly becomes visible when you
push the human physiologicalsystem to its absolute extreme
limit.
But here is the counterpart.
For other specific CPG sites,the methylation in these
centenarians remain incrediblytight, predictable, and fully
functional, even at 105 yearsold.
Wow.
Meaning that the core biologicalsoftware governing their
(12:12):
survival is almost completelyimmune to the chaotic noise of
aging.
SPEAKER_01 (12:17):
That is wild.
And when I was digging into thesupplemental data of that French
study to see like which geneswere staying so perfectly tuned,
one specific gene kept coming upthat I just got completely
obsessed with (12:26):
ELVL2.
SPEAKER_00 (12:29):
Ah, yes.
ELVL2.
It stands for elongation of verylong-chain fatty acids protein
2.
SPEAKER_01 (12:36):
Very catchy.
Just rolls right off the tongue.
But this gene is incredible.
It's heavily involved in lipidmetabolism, right?
Specifically in the retina.
SPEAKER_00 (12:44):
Yes.
It synthesizes very long-chainpolyunsaturated fatty acids,
which are absolutely criticalfor the structural integrity and
function of photoreceptor cellsin your eyes.
Now, as a normal human ages, theCPG island associated with the
ELVL2 gene becomes progressivelyhypermethylated.
It accumulates those methylgroups.
SPEAKER_01 (13:03):
The padlocks get snapped onto the door.
SPEAKER_00 (13:05):
Exactly.
The steric hindrance wediscussed earlier occurs.
The transcription machinerycan't access the gene, so its
expression is downregulated.
The older you get, the less ofthis vital lipid synthesizing
protein you produce, andconsequently your retinal
function declines.
SPEAKER_01 (13:22):
Right, which we just call getting old.
You get into your 70s, yourvision gets worse, macular
degeneration kicks in, it's justwear and tear, right?
Like a scratch camera lens.
But, and this is the part thatreframes aging entirely, you
look at the mouse studies onthis specific gene.
SPEAKER_00 (13:36):
The mouse study on ELO VL2 is a watershed moment in
epigenetics.
SPEAKER_01 (13:40):
Ah.
SPEAKER_00 (13:41):
Researchers took older mice whose vision had
degraded precisely because theirELO VL2 gene had been
epigenetically silenced.
But instead of treating the eyephysically, they intervened at
the molecular level.
SPEAKER_01 (13:52):
Okay.
SPEAKER_00 (13:52):
They artificially removed the hypermesylation.
They essentially picked thepadlocks off the gene and
restored the youthful expressionof ELO VL2.
SPEAKER_01 (14:00):
And it cured their blindness.
Hold on, let's just sit withthat.
They didn't replace the eye,they didn't give them new stem
cells.
The lens of the camera wasn'tactually scratched at all.
The body just forgot how to turnon the autofocus and they just
went into the software andflipped it back on.
SPEAKER_00 (14:15):
It perfectly illustrates the difference
between structural degradationand epigenetic silencing.
For decades, we assumed agingwas purely structural, the
protein simply broke down beyondrepair.
But this proves that in manytissues, the cellular hardware
is still perfectly intact andcapable.
SPEAKER_01 (14:33):
It's just waiting for instructions.
SPEAKER_00 (14:34):
Exactly.
The software is just telling itnot to run.
If you reset the methylationpattern, the hardware boots up
and works exactly as it did inyouth.
SPEAKER_01 (14:42):
I mean, biological age is a two-way street.
You can literally put the car inreverse.
That is the most optimisticthing I've ever read.
SPEAKER_00 (14:49):
It's incredibly promising for specific tissue
types.
SPEAKER_01 (14:51):
Okay, I hear the four specific tissue types
caveat.
You're setting me up for areality check here.
Because having the physical bodyand the perfectly clear vision
of a 70-year-old when you're 105is a massive win.
But what about the brain?
Does any of this matter if Ihave the heart and eyes of a
young man, but I don't know whomy kids are?
Do these epigenetic clocks, thegrimmages that predict mortality
(15:15):
so well, do they predict if wekeep our memories?
SPEAKER_00 (15:18):
This brings us to the most sobering part of the
longevity data, honestly, and ittakes us straight into the WIM
study.
Because if we're asking whetherour current biological clocks
can predict cognitive decline,the answer is a profound, deeply
concerning no.
SPEAKER_01 (15:32):
Okay, listeners, strap in for this because this
is the cognitive blind spot, andit genuinely gave me an
existential crisis.
Let's break down WIMS.
What exactly is this study?
SPEAKER_00 (15:40):
WIM stands for the Women's Health Initiative Memory
Study.
In the world of gerontology, itis a monumental, incredibly
robust piece of research.
The methodology is staggering.
They took a cohort of over 5,800women, starting all the way back
between 1996 and 1999, and theytracked them meticulously for
decades.
SPEAKER_01 (15:59):
And they were tracking their cognitive
function, right?
How did they measure that oversuch a long time?
SPEAKER_00 (16:04):
They used rigorous, standardized cognitive
assessments over time.
Specifically, they used themodified mini mental state
examination, and later thetelephone interview for
cognitive status, which allowedthem to track participants even
if they became homebound.
Smart.
They were aggressivelymonitoring for the onset of mild
cognitive impairment orfull-blown dementia.
(16:27):
And while they were doing this,they were continually taking
blood samples to map theparticipants' DNA methylation
profiles.
SPEAKER_01 (16:33):
So they have decades of cognitive data matched
perfectly with decades of bloodDNA, like the perfect setup.
SPEAKER_00 (16:39):
Exactly.
And recently, researchers tookall that blood DNA methylation
data and ran it through 15different state-of-the-art
epigenetic clocks.
They use Grimage 2, they useDunedin pace, which doesn't just
guess your age but calculatesthe actual speedometer of your
aging at that exact moment.
SPEAKER_01 (16:56):
I've heard of that one.
Very cool tech.
SPEAKER_00 (16:58):
Very.
They even use a clock calledDNA, which was specifically
designed to measure intrinsiccapacity and actually included
cognitive test scores in histraining data.
SPEAKER_01 (17:08):
So they threw the absolute best predictive
software humanity has evercreated at this massive data
set.
What was the goal?
What were they trying to answer?
SPEAKER_00 (17:17):
Two very specific questions.
First, can these 15 clockspredict exceptional longevity,
which they defined as survivingto age 90?
And second, and far moreimportantly, can they predict
cognitively healthy longevity?
Meaning, can the clocks tell thedifference between someone who
survives to 90 with a sharpintact memory versus someone who
(17:39):
survives to 90 but suffers fromsevere dementia?
SPEAKER_01 (17:42):
Right.
What did they find?
SPEAKER_00 (17:43):
The first half of the findings were exactly what
you'd expect based on ourdiscussion of Grimmage.
The advanced second and thirdgeneration clocks, particularly
Grimmage 2 and Dundan Pace, werephenomenally accurate at
predicting who would physicallysurvive to age 90.
SPEAKER_01 (17:56):
So the body holds up.
SPEAKER_00 (17:58):
Right.
If your blood methylation showedaccelerated aging, your
statistical odds of reaching 90plummeted.
They predicted physicalmortality beautifully.
But out of all 15 clocks tested,including the ones designed to
look at intrinsic capacity,absolutely none of them could
predict if a woman would surviveto 90 with intact cognition
versus surviving with dementia.
SPEAKER_01 (18:19):
Wait, literally zero.
Like none of them could see thedementia coming.
SPEAKER_00 (18:23):
Zero.
The statistical odds ratios forsurviving to 90 with an intact
memory versus surviving to 90with dementia were virtually
indistinguishable across all theclocks.
The clocks are entirely blind toneurocognitive aging.
SPEAKER_01 (18:36):
So let me put this in practical terms.
I could go get my blood testedtomorrow.
My Grimmage comes back and says,Congratulations, your biological
age is 20 years younger thanyour driver's license.
Your heart is a machine.
You are going to easily live to100.
But that same test hasabsolutely no idea if my brain
is currently rotting inside myskull.
SPEAKER_00 (18:54):
That is the terrifying reality.
You could have thecardiovascular resilience of an
elite athlete ensuring yourphysical survival to a century,
while a completely undetectedcascade of neurodegeneration is
destroying your hippocampus.
SPEAKER_01 (19:07):
Honestly, what is the point?
What is the point of longevityscience or an immortality pill
if it just traps a fading mindinside a healthy body?
Why are these blood clocks soincredibly blind to the brain?
SPEAKER_00 (19:21):
It comes down to the fundamental architecture of the
human nervous system,specifically the blood-brain
barrier.
The epigenetic clocks wecurrently use are trained on and
tested using peripheral bloodsamples.
But the brain is an incrediblyisolated, highly privileged
immune environment.
SPEAKER_01 (19:38):
It has its own walled garden.
SPEAKER_00 (19:40):
Exactly.
The epigenetic changes happeningin the neurons, the astrocytes,
and the microglia, which are thebrain's immune cells, they do
not easily cross the blood-brainbarrier to show up in your
peripheral bloodstream.
SPEAKER_01 (19:50):
So the blood is telling a completely different
story than the cerebrospinalfluid.
SPEAKER_00 (19:54):
Precisely.
To truly track cognitive aging,we would need epigenetic clocks
trained on cerebrospinal fluid,which requires a spinal tap.
And that is not exactly ascalable routine diagnostic
test.
SPEAKER_01 (20:05):
Yeah, I'm not doing that at my annual physical.
SPEAKER_00 (20:08):
No one is.
This is why the field isdesperately shifting toward
precision gerontology.
The WIM study is a massivewake-up call that we have to
stop optimizing purely forlifespan and start developing
specific targeted biomarkers forhealth span, particularly brain
health.
SPEAKER_01 (20:24):
Okay, so if systemic epigenetic clocks can't predict
cognitive decline, what isactually driving it?
We know something has to bepulling the strings behind the
blood-brain barrier.
And when I was looking throughthe research on what actually
dictates whether you lose yourmemory or not, one specific gene
absolutely dominated the data.
We have to talk about APOE.
SPEAKER_00 (20:43):
Yes.
Epolipoprotein E.
If you want to understand thegenetics of sporadic Alzheimer's
disease and cognitive longevity,you must understand APOE.
It is the architect of thebrain's fate.
SPEAKER_01 (20:53):
Right.
So for you listening, let's laythis out.
APOE is a gene, and it comes inthree distinct flavors or
isoforms, right?
E2, E3, and E4.
SPEAKER_00 (21:01):
Correct.
You inherit one allele from eachparent, giving you your specific
genotype.
The E3E3 combination is by farthe most common in the
population.
It basically serves as thebaseline for normal human
cognitive aging.
But the variants, E2 and E4,drastically alter your
trajectory.
SPEAKER_01 (21:19):
And E4 is the bad one.
SPEAKER_00 (21:21):
Bad is an understatement.
Having just one copy of the E4allele, say URE3E4 increases
your risk of developing sporadicAlzheimer's disease by
approximately fourfold comparedto the baseline.
Wow.
And if you happen to inherit twocopies, an E4, E4 genotype, your
lifetime risk increases by up totwelvefold.
SPEAKER_01 (21:39):
Twelvefold.
I mean, that feels like agenetic death sentence.
That's practically a guaranteeyou're going to get Alzheimer's.
Conversely, though, the E2allele is the golden ticket,
right?
SPEAKER_00 (21:46):
It is highly neuroprotective.
Individuals with the E2 allelehave a significantly reduced
risk of Alzheimer's and areheavily overrepresented in
populations of centenarians whomaintain their cognitive
faculties.
SPEAKER_01 (21:58):
Okay, but why?
What is E2 already?
For physically doing inside thebrain that E2 isn't.
Because honestly, for years, theonly thing I ever heard about
Alzheimer's was amyloid plaques.
The amyloid hypothesis, it wasall about these sticky plaques
just gunking up the brain.
SPEAKER_00 (22:13):
It's true that the APOE protein is responsible for
binding and clearing amyloidbeta from the brain.
And the E4 isoform binds itdifferently, leading to faster
aggregation and slower clearanceof those plaques.
But recent research shows thatthe devastation of E4 goes far
beyond just amyloid.
It is vastly more insidious.
SPEAKER_01 (22:33):
Okay, bring it down.
What else is it doing?
SPEAKER_00 (22:34):
The presence of the E4 allele actively drives
tau-mediated neurodegeneration,the tangles inside the neurons
that actually kill the cell.
Furthermore, it causes severemicroglial dysfunction.
SPEAKER_01 (22:45):
Microelia, those are the immune genitors of the
brain, right?
They sweep up the dead cells anddebris.
SPEAKER_00 (22:50):
Exactly.
But in the presence of E4, thesejanitors become erratic and
highly inflammatory.
It also causes astrocytereactivity, essentially bathing
the brain tissue in a constantlow-grade inflammatory state.
And perhaps most structurallydamaging, the E4 allele leads to
the physical breakdown of theblood-brain barrier itself.
SPEAKER_01 (23:10):
Wait, the wall protecting the brain from
systemic toxins just starts toleak?
SPEAKER_00 (23:14):
Yes.
The tight junctions fail.
So note now peripheralinflammation and toxins can
flood directly into the braintissue, significantly
accelerating the decline.
SPEAKER_01 (23:23):
Okay, that is incredibly bleak.
If you are listening to this andyou know you have the APOE E4
gene, that sounds terrifying.
It sounds like absolute geneticfate.
Like you just drew the shortstraw and you just have to wait
for your brain to leak and catchfire.
But this is a deep dive onepigenetics, the software layer.
So, how much of this is actuallyfate?
SPEAKER_00 (23:41):
This is where the narrative shifts from despair to
incredible empowerment, becauseAPOE is absolutely not just
genetic fate.
The expression of the APO being,how loud it is shouting its
instructions into your brain, isheavily, heavily controlled by
epigenetics.
SPEAKER_01 (23:54):
Okay, bring us back to the molecular padlocks, the
methyl groups.
SPEAKER_00 (23:58):
Remember the CPG islands we discussed?
The dense clusters of cytosineand guanine where methylation
occurs?
Well, the regulatory region ofthe APOE gene is incredibly
dense with these CPG sites.
And here is the most fascinatingbiological quirk.
The sequence difference thatcreates the dangerous E4 allele
actually introduces more CPGsites into the gene compared to
(24:21):
E2 or E3.
SPEAKER_01 (24:22):
Wait, hold on.
Let me make sure I'm visualizingthis correctly.
The E4 allele, the dangerousone, has more physical spots for
methylation to occur.
SPEAKER_00 (24:29):
Exactly.
The E4 allele has the greatestnumber of CPG sites.
The protective E2 allele has theleast.
SPEAKER_01 (24:34):
Okay.
So if CPG sites are basicallythe volume dials for a gene, the
E2 allele is like a tiny littleradio without much of a volume
knob.
It just quietly plays itsprotective tune in the
background.
But the E4 allele has thismassive, highly sensitive,
multi-channel volume dial builtright into it.
SPEAKER_00 (24:50):
That is an absolutely brilliant metaphor,
yes.
Because it has so many CPGsites, the E4 allele is uniquely
susceptible to epigeneticregulation.
Its expression can be crankedall the way up to a 10, flooding
the brain with inflammation, orit can be heavily muted, dialed
down to a one or a two.
SPEAKER_01 (25:06):
And who turns the dial?
SPEAKER_00 (25:07):
You do.
Your environment, your lifestylechoices.
This is why we see such massiveclinical discordance, even among
people with the highest risk,the E4E4 carriers.
You will see one E4E4 individualdevelop severe Alzheimer's at
65.
You will see another E4E4individual remains cognitively
sharp until 85 or 90.
SPEAKER_01 (25:27):
They have the exact same hardware.
What explains a 20-yeardifference in brain survival?
SPEAKER_00 (25:31):
Epigenetic modifiers turning that massive volume
dial.
Environmental stimuli influenceDNA methylation gradually over
time.
Diet is a profound modifier.
Maintaining healthy lipidprofiles and a high intake of
polyunsaturated fatty acidsdirectly alters the methylation
patterns on the APOE promoter,turning the volume down on E4.
SPEAKER_01 (25:49):
What about exercise?
SPEAKER_00 (25:50):
Physical exercise physically alters the metabolic
response of the prefrontalcortex and hippocampus.
It induces the expression ofenzymes that add protective
methyl groups to the APOE gene,silencing the toxic downstream
effects.
SPEAKER_01 (26:04):
That is so profoundly empowering,
completely reframes genetics.
It's not, you know, you have thebad gene, game over.
It's you have a highly sensitivegene, so you need to manage your
software better than anyoneelse.
Your lifestyle choices areliterally physically reaching
into your brain and turning thevolume down on Alzheimer's.
SPEAKER_00 (26:22):
Exactly.
And beyond lifestyle, thescientific community is actively
trying to develop therapies thatmanipulate this software.
We're discovering entirely newlayers of epigenetic control,
like microRNAs.
SPEAKER_01 (26:34):
Right.
I read about this in the notes.
Mir 650, what is a microRNA?
SPEAKER_00 (26:38):
It's a tiny non-coding strand of RNA.
It doesn't build a protein.
Instead, it acts like aninterceptor missile.
The research showed that Mir 650specifically targets the
messenger RNA of the APOE geneand degrades it before it can
build the APOV protein.
It essentially gags the gene.
SPEAKER_01 (26:54):
So if we could figure out a way to deliver or
boost MIR-650 in the brain, wecould theoretically just hit the
mute button on the APOE E4 genealtogether.
SPEAKER_00 (27:03):
In vitro, it significantly reduces APOE
expression.
Translating that into a safehuman therapy that crosses the
blood-brain barrier is immenselycomplex.
But the proof of concept isthere.
We can intervene epigenetically.
SPEAKER_01 (27:16):
And speaking of intervening, there was also
mention of a literal genetherapy in the pipeline,
LEX1001.
SPEAKER_00 (27:22):
Yes, LEX1001 is a fascinating approach.
It uses an adeno-associatedviral vector, a hollowed out
virus that can't make you sickbut is excellent at sneaking
into cells.
They use this viral vector todeliver the protective APOE E2
allele directly into the centralnervous system of patients who
have the E4 genotype.
SPEAKER_01 (27:39):
Dude, they are literally using a virus as an
armored transport truck to dropthe golden ticket E2 gene into
the brain to fight the bad E4gene.
That is sci-fi level medicine.
SPEAKER_00 (27:49):
It is the cutting edge of neurogenetics,
attempting to artificiallychange the ratio of ApoE
isoforms in the brain to haltneurodegeneration.
SPEAKER_01 (27:56):
Okay, so we have viral gene therapy on the
horizon.
We have lifestyle choicesturning the epigenetic volume
dials.
But let's dig into the how ofthat lifestyle piece.
Because if my diet and myexercise dictate my APOE
expression, how does the cellactually know?
How does a neuron translate thefact that I skipped breakfast
into a molecular signal thatsays turn down APOE and start
(28:18):
repairing the DNA?
What is the physical messenger?
SPEAKER_00 (28:21):
To answer that, we really had to look at the master
regulator of cellular stress.
We had to look at the longevityswitch.
It is time to talk about FOXO3.
SPEAKER_01 (28:29):
FOXO3.
Okay, I know a bit about thelongevity pathways.
You hear about MTR, you hearabout autophagy, but FOXO3 seems
to be the absolute grandmasterof the cell's repair systems.
SPEAKER_00 (28:38):
If APOE is the architect of the brain's fate,
FOXO3 is the master architect ofcellular survival across the
entire body.
It is a transcription factor.
SPEAKER_01 (28:47):
Meaning its job is to go into the nucleus, bind to
the DNA, and turn genes on.
SPEAKER_00 (28:51):
Exactly.
The genes it turns on areincredible.
When FOC XO3 enters the nucleus,it activates a massive battery
of survival mechanisms, triggerscell cycle arrest, literally
telling a damaged cell to stopdividing before it becomes
cancerous.
Wow.
It upregulates DNA repairenzymes to fix mutations.
It activates antioxidantdefenses to clear out free
radicals.
(29:11):
And if the cell is too damagedto be saved, FOCXO3 triggers
apoptosis, programs cell deathfor the greater good of the
organism.
SPEAKER_01 (29:19):
It is the ultimate triage medic.
It assesses the damage anddictates survival.
But a medic that powerful can'tjust be running around the cell
turning things on and off allthe time, right?
SPEAKER_00 (29:27):
No.
That would be chaotic.
If FOXO3 is active all the time,the cell can never grow or
divide.
So FOCXO3 is kept underextraordinarily tight lock and
key.
It is heavily regulated bypost-translational
modifications.
SPEAKER_01 (29:40):
Because software patches again.
SPEAKER_00 (29:42):
Yes.
And what is most fascinating inthe recent research is a literal
physical molecular turf war thathappens on a single specific
amino acid on the FOXO3 protein.
We are looking at lysine 271.
SPEAKER_01 (29:54):
Okay, I was looking at the proteomics data here, and
this part is incredible.
Set the scene for us.
What is happening at lysine 271?
SPEAKER_00 (30:01):
We have two major enzymatic players competing for
control.
The first is CERT1.
Now, Cert 1 is a very famousanti-aging protein.
It belongs to a family calledCERTUINS.
It is a decetylus, meaning itremoves acetyl groups.
For years we knew that duringtimes of cellular stress, CERT1
removes an acetyl group fromFOLCOXO3, specifically at lysine
(30:21):
271.
This modification helps activateFOXO3.
SPEAKER_01 (30:25):
Right, and CERT1 is heavily dependent on NAD plus
IR, right, which connects it toenergy metabolism.
But then a new player enters thearena, SET 9.
SPEAKER_00 (30:34):
Exactly.
SET 9 is a methyltransferase.
Its entire biological purpose isto add methyl groups.
And it wants to methylate FOXO3.
And where does it want to putthat methyl group?
SPEAKER_01 (30:43):
The exact same spot.
Lysine 271.
They are literally fighting overthe exact same molecular parking
spot.
SPEAKER_00 (30:48):
They are competing directly.
Because of steric hindrancephysical crowding, they cannot
both modify lysine 271 at thesame time.
It is mutually exclusive.
If set 9 slaps a methyl group onthat lysine, CERT 1 is
physically blocked frominteracting with it.
SPEAKER_01 (31:01):
Okay, so if set 9 wins the fight and it methylates
lysine 271, what does thatactually physically do to the
FOXO3 protein?
SPEAKER_00 (31:09):
This is one of the most brilliant paradoxical
pieces of biological engineeringI have ever seen.
When set 9 methylates FOCOX3, itactually causes a conformational
change that decreases thephysical stability of the
protein.
The half-life of FOC XO3 dropssignificantly.
It is recognized by degradationmachinery and destroyed much
faster by the cell.
SPEAKER_01 (31:30):
Yeah, wait, it gets destroyed faster.
That sounds like a terriblething.
If FOXO3 is the medic and Set9destroys the medic, how does the
cell repair itself?
SPEAKER_00 (31:38):
You would absolutely think it was a negative outcome.
But here's the paradox.
While the methylation makes theprotein physically unstable and
short-lived, it simultaneouslymassively increases its
transcriptional activity.
SPEAKER_01 (31:49):
I'm sorry, what it is physically falling apart, but
it's working harder.
SPEAKER_00 (31:52):
Think of it like a biological overdrive gear or a
supernova.
The methylation by set 9 turnsFOXO3 into a highly active,
highly concentrated, but veryshort-lived burst of stress
response.
It enters the nucleus, binds tothe DNA, turns on the repair
genes with furious efficiency,and then, because it is
unstable, it gets degradedquickly.
SPEAKER_01 (32:13):
Oh, because if it didn't get degraded, the cell
would be permanently stuck intriage mode and could never go
back to growing.
SPEAKER_00 (32:19):
Exactly.
It prevents pathologicalpermanent cell cycle arrest.
It is an exquisite fine-tuningdial.
It allows for a massive,immediate response to stress,
followed by a rapid return tonormal cellular function once
the damage is cleared.
SPEAKER_01 (32:31):
That is just the sheer mechanical elegance of
that is breathtaking.
So the ultimate question for thelistener right now is how do we
manually reach into our cellsand trigger that supernova?
How do we flip the FOXO3 switchand tell it to start repairing
our DNA?
SPEAKER_00 (32:46):
The most robust, reliable, and evolutionarily
conserved way to activate FOXO3is through dietary restriction.
Or as it's more commonlypracticed, fasting.
SPEAKER_01 (32:54):
Right.
We all know fasting triggersrepair pathways.
Everyone in the longevity spacetalks about MTOR and autophagy
when you fast.
But what blew my mind in thesesources was the exact molecular
cascade, the physical messenger.
Walk us through the actualpathway.
I skipped breakfast.
What happens in the blood?
SPEAKER_00 (33:12):
When you restrict nutrients, specifically protein
and glucose, your body sensesthe deprivation.
Consequently, the circulatinglevels of a hormone called IGF1
insulin-like growth factor, onedrop significantly in your
bloodstream.
SPEAKER_01 (33:24):
Okay, IgF-1 drops.
How does the cell sense that?
SPEAKER_00 (33:27):
Your cells have IgF-1 receptors on their
surface.
When those receptors stopreceiving the IGF-1 signal, it
causes a cascading shutdown of amajor signaling highway inside
the cell called the ACTPKBpathway.
SPEAKER_01 (33:40):
ACT.
That's a kinase, right?
Meaning its job is tophosphorylate things, to slap
phosphate groups onto otherproteins.
SPEAKER_00 (33:46):
Aaron Powell Correct.
When you are well fed and IgF1is high, ACT is highly active.
And what ACT does isaggressively phosphorylate
FOXO3.
SPEAKER_01 (33:53):
Aaron Powell And what does adding a phosphate
group to FOXO3 do?
SPEAKER_00 (33:56):
Aaron Powell It creates a binding site for a
family of chaperone proteinscalled 1433 proteins.
These proteins physically grabthe phosphorylated FOXO3 and
drag it out of the nucleus,trapping it in the cytoplasm.
It literally locks the medic outof the hospital.
SPEAKER_01 (34:13):
Aaron Powell Because if you're eating a massive meal,
the cell is in growth mode.
It wants to divide and buildtissue.
It absolutely does not wantFXSO3 inside the nucleus
ceiling.
Stop growing, let's look for DNAmutations.
SPEAKER_00 (34:24):
Aaron Powell Precisely.
Growth and repair are mutuallyexclusive biological states.
You cannot do both optimally atthe same time.
But when you fast turns off.
SPEAKER_01 (34:33):
The phosphorylation stops.
SPEAKER_00 (34:34):
The lock breaks.
The 1433 proteins release FOXO3,and FOXO3 rushes back into the
nucleus, triggers the CERT1 andSET 9 dynamic, and initiates a
massive systemic cellular repairand cleanup process.
SPEAKER_01 (34:46):
I mean, the fact that the feeling of hunger, your
stomach growling, isfundamentally the exact same
biological signal as your DNAbeing scrubbed clean and your
epigenetic software beingoptimized.
You are literally leveraging anancient evolutionary survival
mechanism.
SPEAKER_00 (34:59):
You are.
In times of famine, a speciescannot afford to expend energy
on reproduction or tissuegrowth.
The organism must hunker down,repair existing cellular damage,
and survive until the foodsupply returns.
That deep evolutionary survivalpathway is the anti-aging
pathway.
SPEAKER_01 (35:16):
It makes so much sense.
But okay, listen, let me be thevoice of the average person
here.
Fasting is hard, people likefoods, skipping meals sucks.
So naturally, the entirebiomedical industry is asking
the same question.
Can we just take a pill to dothis?
Can we get the FOXO3 repair andthe APOE muting without the
hunger?
SPEAKER_00 (35:34):
Ah, the holy grail.
The quest for the fasting pillin a bottle.
This is the cutting edge oflongevity pharmacology testing
existing drugs against thesebiological classes to see if we
can chemically reverseepigenetic age.
SPEAKER_01 (35:45):
Right.
And everyone in the longevityspace is constantly debating the
big three (35:48):
metformin, caloric restriction, and rapamycin.
So let's talk about the pills.
What does metformin actually do?
SPEAKER_00 (35:54):
Metformin is primarily a type 2 diabetes
drug, but it has massivelongevity implications.
Mechanistically, it inhibitscomplex eye in the mitochondria,
which slightly restrictscellular energy production.
This drop in energy activates anenergy sensing enzyme called
AMPK.
SPEAKER_01 (36:12):
Which basically tricks the cell into thinking
it's starving, even if it isn't.
SPEAKER_00 (36:15):
Essentially, yes.
Activating AMPK triggersdownstream pathways that mimic
many of the effects of nutrientdeprivation, leading to improved
metabolic markers andpotentially delayed epigenetic
aging.
But the drug that generates themost excitement right now is
undoubtedly rapamycin.
SPEAKER_01 (36:31):
Rapamycin, yes, the crown jewel.
It physically inhibits MTOR,right, which is the mammalian
target of rapamycin.
And inhibiting MTOR basicallyforces the cell to stop growing
and start cleaning up, verysimilar to Evoxo3 activation.
People are taking this off labelright now.
I know people taking it.
They treat it like theimmortality pill.
SPEAKER_00 (36:47):
And here's where we must introduce a very dry, very
sobering scientific realitycheck.
Because the translation topharmacology from bench to
bedside is littered withfailures.
Rapamycin is fundamentally animmunosuppressant.
Now, the excitement is warrantedbased on early data.
In mice, when researchersadministered rapamycin for 22
(37:07):
months, it significantlydecreased their DNA methylation
epigenetic age compared to thecontrol group.
It was a staggering success.
SPEAKER_01 (37:14):
A massive success in mice, but I can hear the butt in
your voice.
What happened next?
SPEAKER_00 (37:20):
The researchers took the next logical step.
They moved from short-livedrodents to long-lived primates.
They tested rapamycin on acohort of common marmosets.
SPEAKER_01 (37:27):
Marmosets, which are evolutionarily much closer to
us.
Their biology, their metabolismis vastly more similar to a
human than a mouse's.
SPEAKER_00 (37:35):
Exactly.
They treated these marmosetswith daily rapamycin for over
two years, a very robustlongitudinal study.
As a result, rumroll.
Rapamycin administration did notsignificantly change their DNA
methylation epigenetic age.
SPEAKER_01 (37:47):
Oh wow.
Nothing.
No biological time travel forthe monkeys.
SPEAKER_00 (37:50):
No significant epigenetic age reversal
whatsoever.
SPEAKER_01 (37:53):
Why?
If it works so perfectly in amouse, why does it completely
fail to change the epigeneticclock in a primate?
SPEAKER_00 (38:00):
Because of the profound complexity of primate
metabolic compensation.
Mice are short-lived, fastmetabolism organisms.
Their biological pathways areessentially a straight line.
You block MTOR, the systemshifts immediately to repair.
But primates, humans included,are designed for extreme
longevity already.
We have highly complex,redundant feedback loops.
SPEAKER_01 (38:21):
So they fight back.
SPEAKER_00 (38:22):
Yes.
When you artificially suppressMTOR in a primate with a drug,
the body senses the chemicalblockage and simply reroutes.
It upregulates compensatorypathways to maintain its
biological equilibrium.
SPEAKER_01 (38:33):
So the primate body basically says, nice try with
the rapamycin, but I have abackup system and a backup for
the backup, and we're going tokeep aging normally.
SPEAKER_00 (38:41):
Precisely.
It is a vital reminder of thefundamental rule of longevity
science.
Mice are not tiny humans.
And mice are certainly not tinymarmosets.
We are making unbelievablestrides in understanding the
mechanisms of aging.
We understand FOC XO3, weunderstand APOE, we understand
the methylation clocks, butwe're absolutely not at the
(39:02):
immortality pill in a bottlestage.
Biology and long-lived primatesis stubbornly resilient.
SPEAKER_01 (39:08):
Honestly, that is a bummer for the people popping
off label pills, but it is suchan important point.
It means I can't just eatdonuts, avoid the gym, pop a
lapomycin, and expect mygrimmage to say I'm 20.
The lifestyle stuff, thefasting, the exercise, the
sleep, it still holds the crownbecause it triggers the entire
systemic symphony of pathways,not just one isolated protein.
SPEAKER_00 (39:28):
It does.
The most effectivescientifically validated
epigenetic modifiers wecurrently have access to are
behavioral and dietary.
You have to earn the epigeneticreversal.
SPEAKER_01 (39:36):
Okay.
Let's pull all of this togetherbecause we have covered an
insane amount of molecularground today.
Let's summarize the journey.
We started with the physicalreality of the epigenome, the
methylation rust on our DNA.
SPEAKER_00 (39:47):
The steric hindrance of methyl groups silencing our
genes, and the realization thatthis process is so
mathematically predictable thatwe can build epigenetic clocks
like grimmage to read ourbiological decay, proving that
chronological age is comforting,but biological age is the actual
receipt.
SPEAKER_01 (40:03):
Then we met the superagers, the centenarians who
are biologically decades youngerthan their birth certificates,
who prove that epigenetic drift,the chaotic noise of aging,
isn't inevitable for everyone.
And we saw that we can actuallypick the padlocks off the genes,
like curing blindness in mice bysimply turning the ELVL2 gene
back on.
SPEAKER_00 (40:23):
But we also confronted the cognitive blind
spot through the WIM study.
The terrifying reality that oursystemic blood clocks can
predict when your heart willfail, but are utterly blind to
the epigenetic neurodegenerationhappening behind the blood brain
barrier.
SPEAKER_01 (40:38):
Which led us to APOE, the architect of that
brain decline.
And the realization that even ifyou carry the massive risk of
the E4 allele, the fact that ithas so many CPG sites makes it a
highly sensitive volume dial.
Your lifestyle is the handturning that dial down.
SPEAKER_00 (40:52):
And finally, we explored the mechanical elegance
of FAXO3, the molecular turf warat lysine 271, and the beautiful
realization that the simple actof experiencing hunger drops
your IGF-1, breaks the ACT lock,and sends a burst of repair
proteins into your nucleus toscrub your DNA clean.
SPEAKER_01 (41:12):
It fundamentally changes how you look at yourself
in the mirror.
You are not a static machinewith a fixed odometer.
You are a dynamic, highlyresponsive biological software
system.
SPEAKER_00 (41:23):
Which leaves us with a highly provocative final
thought to consider.
We have spent all of humanhistory, our art, our
philosophy, our economicsystems, assuming that aging and
decay are inevitable,untreatable conditions.
Life has always been a one-wayarrow of time.
Right.
But if aging is actually just abiochemical software program
governed by reversiblemethylation, and we are actively
learning how to rewrite thatcode, what happens to human
(41:44):
psychology?
What happens to ambition, torelationships, to the structure
of society as a whole whenrunning out of time is no longer
the default foundationalassumption of human existence.
SPEAKER_01 (41:56):
Yeah.
SPEAKER_00 (41:56):
What do you do with your life when the biological
odometer is suddenly meaninglessand your cellular Carfax report
says you have the capacity todrive for another century?
SPEAKER_01 (42:06):
Dude, I I don't even know how to process that.
That completely changes thestakes of everything.
I am going to be thinking aboutthat all week.
All right.
That is our deep dive for today.
Keep your biological softwareupdated, embrace a little bit of
hunger, stay curious, and we'llsee you next time.
So what if I told you that uh there's a
105-year-old French womansitting in a cafe right now
sipping espresso and she has theexact identical cellular
machinery of a 75-year-old.
Like biologically, she hassomehow just lived 30 years
completely off the grid.
SPEAKER_00 (00:17):
Well, I I would push back slightly on that phrase,
the whole off the grid thing,because the entire point of the
data we're looking at today isthat your cells are actually
always keeping a grid.
Like they're keeping afrighteningly accurate, totally
individualized receipt ofabsolutely everything you do.
But I mean, your premise isessentially correct.
The chronological clock on thewall and the biological clock
(00:37):
inside her cells are running atcompletely different speeds.
SPEAKER_01 (00:40):
Aaron Powell Dude, it is wild.
Because today's deep dive isinto the fascinating and
honestly sort of terrifyingscience of measuring and
manipulating biological aging.
We are not just talking about,you know, getting wrinkles or
gray hair here.
We are talking about literalbiological time travel.
SPEAKER_00 (00:55):
Aaron Powell Yes.
And we have a massive stack ofsources for this cutting-edge
research covering things likeepigenetic clock, centenary and
DNA, uh this huge project calledthe WIMS Study on Brain Aging.
SPEAKER_01 (01:07):
Oh man, that one messed me up.
SPEAKER_00 (01:08):
It's sobering.
And we'll get into the exactmolecular switches inside you
right now, like APOE and FOC XO3that dictate how long you live,
and more importantly, how wellyou live.
SPEAKER_01 (01:20):
Aaron Ross Powell Exactly.
And that is uh that's ourmission for you today.
We want to figure out why somepeople are biologically decades
younger than what their birthcertificates say.
We're gonna unpack how lifestylechanges actually like physically
rewrite your DNA's destiny.
So I want you to think aboutyour own biological age right
now as you're listening.
Right.
Think about the number ofcandles on your last birthday
(01:41):
cake, and then ask yourselfwhat's actually happening under
the hood.
SPEAKER_00 (01:43):
Aaron Powell Because before we can even begin to talk
about stopping aging or uhhacking the aging process, as
people like to say, we reallyhave to understand how the body
physically measures it.
We have to talk about theepigenome.
SPEAKER_01 (01:55):
Aaron Powell Right.
And I think most people, youknow, anyone who follows health
science understands the basicconcept of DNA, right?
It's the blueprint, it's thehardware of your computer,
you're born with it, itbasically doesn't change.
Correct.
But the epigenome is like thesoftware.
So walk us through the actualphysical mechanism here.
What is this epigenetic softwareactually made of?
SPEAKER_00 (02:15):
Right.
So at the molecular core of allthis is a process called DNA
methylation.
And chemically, it isbeautifully simple.
It's just the addition of a tinymolecule called a methyl group.
SPEAKER_01 (02:25):
Which is what, exactly?
SPEAKER_00 (02:26):
That is just one carbon atom bonded to three
hydrogen atoms.
So CH3.
Your body basically takes thistiny methyl group and attaches
it directly onto the DNA strand,specifically at places where a
cytosine base sits right next toa guanine base.
We call these spots CPGdinucleotides.
SPEAKER_01 (02:43):
Wait, wait, so when we talk about genes turning on
or off, the CH3 thing is theactual physical switch.
How does slapping a carbon andthree hydrogens onto the DNA
actually stop a gene fromworking?
Like, does it just get in theway?
SPEAKER_00 (02:56):
That is exactly what it does.
It's a concept called sterichindrance.
Imagine your DNA as a massive,tightly coiled ball of string.
That's chromatin.
SPEAKER_01 (03:07):
Okay, I'm with you.
SPEAKER_00 (03:08):
For a gene to be expressed, the cellular
machinery, meaning thetranscription factors, they have
to physically land on the DNAstrand and read the code.
When you attach these bulkymethyl groups to the DNA, they
literally take up physicalspace.
They just block thetranscription machinery from
landing.
SPEAKER_01 (03:24):
Oh wow.
So it's literally like putting aphysical padlock on a door.
SPEAKER_00 (03:28):
Precisely.
And it actually goes even deeperthan that.
These methyl groups also attractother proteins that essentially
spool the DNA even tighter,winding it up so densely that
the gene is completelyinaccessible.
It's totally silenced.
Now, for most of your life, thisis highly systematic and
necessary.
Why?
Well, your body uses methylationto ensure an eye cell stays in
(03:48):
eye cell and doesn't suddenlystart, you know, producing
stomach acid.
SPEAKER_01 (03:52):
Right, which would be terrible.
An eyeball full of acid, nothanks.
SPEAKER_00 (03:55):
Highly problematic, yes.
But as we age, the pattern ofthis methylation changes.
It shifts.
Some areas that are supposed tobe active get hypermethylated,
meaning they get locked up.
Meanwhile, other areas actuallylose their methyl groups and get
inappropriately turned on.
SPEAKER_01 (04:11):
Okay, so this software program is basically
slowly getting buggier andbuggier over time.
But what blew my mind in thesesources is that this buggy
degradation isn't just likerandom chaos.
It's so predictable thatscientists figured out how to
build clocks out of it.
SPEAKER_00 (04:26):
Yes.
Nearly a decade ago, scientists,notably Steve Horvath, realized
that a large number of these CPGsites change their methylation
status over time with justastonishing mathematical
predictability.
SPEAKER_01 (04:39):
Like clockwork.
SPEAKER_00 (04:40):
Literally, if you look at enough of these specific
sites across the genome, you cancalculate a highly accurate age
for that tissue.
These are epigenetic clocks.
SPEAKER_01 (04:47):
Right.
The original Horvath clock.
But I mean, looking at theliterature, that first
generation clock was basicallyjust a biological party trick,
wasn't it?
SPEAKER_00 (04:54):
A party trick is a bit harsh, but I see your point.
SPEAKER_01 (04:57):
I mean, it looks at your DNA and says, yep, this
person has been alive for 45years.
Which is cool for forensics.
Like uh if you find a blood dropat a crime scene, but it doesn't
tell you anything about howhealthy that 45-year-old
actually is.
SPEAKER_00 (05:10):
Aaron Powell Exactly.
The first generationchronological clocks were
trained entirely onchronological age.
They were designed to predicttime since birth.
But the field quickly realizedthe limitation there.
I mean, if you and I are bothexactly 40 years old
chronologically, we're nothypothetically.
If we're both 40, but you smokea pack a day and sleep three
(05:32):
hours a night, and I runmarathons and eat a perfectly
balanced Mediterranean diet, ourbiological ages should look
completely different.
SPEAKER_01 (05:39):
Obviously.
SPEAKER_00 (05:40):
But a chronological pluck would just say we're both
40.
SPEAKER_01 (05:42):
Right.
Which brings us to the secondgeneration, the biological
clocks.
SPEAKER_00 (05:46):
Correct.
Clocks like phenynoage andgrimmage.
And these were revolutionarybecause instead of being trained
to predict your birthday, theywere trained to predict your
physiological decay.
Phenoage, for instance, wasn'tjust built on age data.
It was trained using 10 specificclinical markers of
physiological breakdown, thingslike white blood cell count,
albumin levels, and C reactiveprotein, which is a major marker
(06:10):
of systemic inflammation.
SPEAKER_01 (06:11):
So it's looking at the methylation patterns on your
DNA and correlating them withthe actual physical breakdown of
your organs in real time.
SPEAKER_00 (06:19):
Yes.
It looks for the epigeneticsignature of inflammation and
organ dysfunction.
But then the field went a stepfurther with grimmage.
SPEAKER_01 (06:27):
Grimmage, which honestly sounds like a super
villain name or like a terriblemedieval disease.
SPEAKER_00 (06:33):
It is aptly named, honestly, because grimmage is an
extraordinarily accuratepredictor of mortality.
It uses plasma proteins, butcrucially it uses a metric
called smoking pack years totrain its model.
SPEAKER_01 (06:44):
Okay, hold on.
This part of the researchstopped me in my tracks because
they train this DNA clock usingsmoking data.
Like how many cigarettes aperson has smoked?
How does your DNA, how do theselittle CH3 methyl groups know
how many cigarettes you'vesmoked?
SPEAKER_00 (06:58):
Because of the profound systemic impact of the
toxins in tobacco smoke.
When you inhale those chemicals,they trigger massive cellular
stress responses, inflammation,and DNA damage throughout your
entire body.
Right.
Your body responds to thisconstant assault by aggressively
altering its epigeneticsoftware.
It methylates and demethylatesspecific genes to try and manage
(07:19):
that damage.
SPEAKER_01 (07:20):
And Grimmage just reads that damage pattern.
SPEAKER_00 (07:22):
It relies on what we call DNA surrogate biomarkers.
The epigenetic signature ofsmoking is so specific, so
deeply etched into your DNAmethylation patterns, that
Grimmage can look at a bloodsample and calculate your
smoking history with terrifyingprecision.
SPEAKER_01 (07:38):
Dude.
SPEAKER_00 (07:38):
You could sit in your doctor's office and lie,
swearing you quit a decade ago,but Grimmage knows your blood
will completely snitch on you.
SPEAKER_01 (07:45):
That is insane.
Life insurance companies must bedrooling over this tech.
You just can't fake it.
Your cells literally keep thereceipts.
SPEAKER_00 (07:51):
They really do.
Yeah.
And that is why Grimmageoutperforms almost every other
metric in predicting all-causemortality, time to cancer, and
cardiovascular disease.
It captures the true biologicaltoll of your lifestyle choices,
written directly onto yourgenome.
SPEAKER_01 (08:06):
Okay.
So if Grimmage and Finimage arebasically the grim reapers of
predictive biology, you know,reading the decay of our
software, it naturally makes youwonder what happens when you
test people who just absolutelyrefuse to decay.
SPEAKER_00 (08:20):
You were talking about the long-lived
individuals, the extremesuperagers.
SPEAKER_01 (08:24):
Yes, the time travelers.
Because if Grimitz predictsdeath, what does it show when
you test a 105-year-old who islike still taking daily walks
and living completelyindependently?
This brings us to that massiveFrench study in our sources.
And the data here is, I mean, itcompletely breaks the standard
model of aging.
SPEAKER_00 (08:42):
Aaron Powell It is a remarkable cohort.
They analyze French centenariansand semi-supercentenarians,
we'll call them the CSSC group,ranging from 100 to 107 years of
age.
Yeah.
What's crucial here is themethodology.
SPEAKER_01 (08:52):
Okay, break it down.
SPEAKER_00 (08:53):
Instead of using a clock like Horvath's that looks
at hundreds of CPG sites, theytested these superagers using
highly specific epigeneticclocks based on a very small,
tightly curated number of CPGsites.
We're talking just two to foursites total.
SPEAKER_01 (09:09):
Which is fascinating in itself.
They zoomed all the way in onjust a tiny handful of these
molecular padlocks, and what didthey find?
The numbers just blew me away.
SPEAKER_00 (09:17):
The epigenetic clocks calculated their
biological age to be between 15and 28.5 years younger than
their actual chronological age.
SPEAKER_01 (09:25):
I mean, let that sink in for a second if you're
listening to this.
You are 105 years old on paper.
You were born before commercialradio even existed.
But the cellular methylationprofile of your body looks like
someone in their late 70s.
That is biologically cheatingdeaf.
SPEAKER_00 (09:40):
It is a profound deceleration of the aging
process.
And significantly, they found asimilar, though slightly less
extreme, effect in the offspringof these centenarians.
The non-ingenarian andcentenarian offspring, the NCO
group, they were biologically 4to 11.5 years younger than their
chronological age.
SPEAKER_01 (09:57):
So it's heritable.
They literally passed down thisincredibly resilient software to
their kids.
But why?
What makes their methylationpatterns so impossibly stable?
When I was looking through thebreakdown of the study, there
was this really interestingdistinction between the
epigenetic clock and epigeneticdrift.
SPEAKER_00 (10:15):
This is a vital mechanical distinction in
longevity science.
We've been talking aboutepigenetic clocks, the
predictable systematic ticking.
Yeah.
Certain genes gain or losemethyl groups at a very steady
rate across the entire humanpopulation.
That is the clock.
Right.
But epigenetic drift is entirelydifferent.
Drift is the random chaoticscattering of methylation over
(10:37):
time.
SPEAKER_01 (10:37):
Okay, so if the clock is a highly precise
metronome keeping the temple ofaging, the drift is like the
individual members of theorchestra slowly getting out of
tune, hitting random notes untilthe whole symphony just sounds
like garbage.
SPEAKER_00 (10:49):
That is exceptionally good analogy,
actually.
Drift is the cumulative effectof stochastic or random
environmental factors.
Every minor cellular stressor,every minor inflammatory event
over a lifetime adds a tiny bitof noise to the epigenome.
SPEAKER_01 (11:03):
Give me an example of that.
SPEAKER_00 (11:04):
Well, identical twins are born with identical
meshillation patterns, but bythe time they're 75, their
epigenomes have driftedsignificantly apart purely
because they experienceddifferent random environmental
exposures, different diets,different stress, different
illnesses.
SPEAKER_01 (11:19):
Okay, so the orchestra gets out of tune for
everyone.
But what did the French studyshow about these 105-year-olds?
SPEAKER_00 (11:25):
This is where it gets highly technical, but
incredibly revealing.
They looked at the dispersion ofmethylation values, the variance
at these specific CPG sites.
For some sites, the epigeneticdrift was massively accelerated,
but only in the extremesuperagers.
SPEAKER_01 (11:39):
Wait, I want to make sure I understand this.
You're saying that normalpeople, people who die at 80 or
85, they literally don't livelong enough to even experience
this specific type of epigeneticnoise.
SPEAKER_00 (11:50):
Exactly.
The drift at these specific locionly becomes visible when you
push the human physiologicalsystem to its absolute extreme
limit.
But here is the counterpart.
For other specific CPG sites,the methylation in these
centenarians remain incrediblytight, predictable, and fully
functional, even at 105 yearsold.
Wow.
Meaning that the core biologicalsoftware governing their
(12:12):
survival is almost completelyimmune to the chaotic noise of
aging.
SPEAKER_01 (12:17):
That is wild.
And when I was digging into thesupplemental data of that French
study to see like which geneswere staying so perfectly tuned,
one specific gene kept coming upthat I just got completely
obsessed with (12:26):
ELVL2.
SPEAKER_00 (12:29):
Ah, yes.
ELVL2.
It stands for elongation of verylong-chain fatty acids protein
2.
SPEAKER_01 (12:36):
Very catchy.
Just rolls right off the tongue.
But this gene is incredible.
It's heavily involved in lipidmetabolism, right?
Specifically in the retina.
SPEAKER_00 (12:44):
Yes.
It synthesizes very long-chainpolyunsaturated fatty acids,
which are absolutely criticalfor the structural integrity and
function of photoreceptor cellsin your eyes.
Now, as a normal human ages, theCPG island associated with the
ELVL2 gene becomes progressivelyhypermethylated.
It accumulates those methylgroups.
SPEAKER_01 (13:03):
The padlocks get snapped onto the door.
SPEAKER_00 (13:05):
Exactly.
The steric hindrance wediscussed earlier occurs.
The transcription machinerycan't access the gene, so its
expression is downregulated.
The older you get, the less ofthis vital lipid synthesizing
protein you produce, andconsequently your retinal
function declines.
SPEAKER_01 (13:22):
Right, which we just call getting old.
You get into your 70s, yourvision gets worse, macular
degeneration kicks in, it's justwear and tear, right?
Like a scratch camera lens.
But, and this is the part thatreframes aging entirely, you
look at the mouse studies onthis specific gene.
SPEAKER_00 (13:36):
The mouse study on ELO VL2 is a watershed moment in
epigenetics.
SPEAKER_01 (13:40):
Ah.
SPEAKER_00 (13:41):
Researchers took older mice whose vision had
degraded precisely because theirELO VL2 gene had been
epigenetically silenced.
But instead of treating the eyephysically, they intervened at
the molecular level.
SPEAKER_01 (13:52):
Okay.
SPEAKER_00 (13:52):
They artificially removed the hypermesylation.
They essentially picked thepadlocks off the gene and
restored the youthful expressionof ELO VL2.
SPEAKER_01 (14:00):
And it cured their blindness.
Hold on, let's just sit withthat.
They didn't replace the eye,they didn't give them new stem
cells.
The lens of the camera wasn'tactually scratched at all.
The body just forgot how to turnon the autofocus and they just
went into the software andflipped it back on.
SPEAKER_00 (14:15):
It perfectly illustrates the difference
between structural degradationand epigenetic silencing.
For decades, we assumed agingwas purely structural, the
protein simply broke down beyondrepair.
But this proves that in manytissues, the cellular hardware
is still perfectly intact andcapable.
SPEAKER_01 (14:33):
It's just waiting for instructions.
SPEAKER_00 (14:34):
Exactly.
The software is just telling itnot to run.
If you reset the methylationpattern, the hardware boots up
and works exactly as it did inyouth.
SPEAKER_01 (14:42):
I mean, biological age is a two-way street.
You can literally put the car inreverse.
That is the most optimisticthing I've ever read.
SPEAKER_00 (14:49):
It's incredibly promising for specific tissue
types.
SPEAKER_01 (14:51):
Okay, I hear the four specific tissue types
caveat.
You're setting me up for areality check here.
Because having the physical bodyand the perfectly clear vision
of a 70-year-old when you're 105is a massive win.
But what about the brain?
Does any of this matter if Ihave the heart and eyes of a
young man, but I don't know whomy kids are?
Do these epigenetic clocks, thegrimmages that predict mortality
(15:15):
so well, do they predict if wekeep our memories?
SPEAKER_00 (15:18):
This brings us to the most sobering part of the
longevity data, honestly, and ittakes us straight into the WIM
study.
Because if we're asking whetherour current biological clocks
can predict cognitive decline,the answer is a profound, deeply
concerning no.
SPEAKER_01 (15:32):
Okay, listeners, strap in for this because this
is the cognitive blind spot, andit genuinely gave me an
existential crisis.
Let's break down WIMS.
What exactly is this study?
SPEAKER_00 (15:40):
WIM stands for the Women's Health Initiative Memory
Study.
In the world of gerontology, itis a monumental, incredibly
robust piece of research.
The methodology is staggering.
They took a cohort of over 5,800women, starting all the way back
between 1996 and 1999, and theytracked them meticulously for
decades.
SPEAKER_01 (15:59):
And they were tracking their cognitive
function, right?
How did they measure that oversuch a long time?
SPEAKER_00 (16:04):
They used rigorous, standardized cognitive
assessments over time.
Specifically, they used themodified mini mental state
examination, and later thetelephone interview for
cognitive status, which allowedthem to track participants even
if they became homebound.
Smart.
They were aggressivelymonitoring for the onset of mild
cognitive impairment orfull-blown dementia.
(16:27):
And while they were doing this,they were continually taking
blood samples to map theparticipants' DNA methylation
profiles.
SPEAKER_01 (16:33):
So they have decades of cognitive data matched
perfectly with decades of bloodDNA, like the perfect setup.
SPEAKER_00 (16:39):
Exactly.
And recently, researchers tookall that blood DNA methylation
data and ran it through 15different state-of-the-art
epigenetic clocks.
They use Grimage 2, they useDunedin pace, which doesn't just
guess your age but calculatesthe actual speedometer of your
aging at that exact moment.
SPEAKER_01 (16:56):
I've heard of that one.
Very cool tech.
SPEAKER_00 (16:58):
Very.
They even use a clock calledDNA, which was specifically
designed to measure intrinsiccapacity and actually included
cognitive test scores in histraining data.
SPEAKER_01 (17:08):
So they threw the absolute best predictive
software humanity has evercreated at this massive data
set.
What was the goal?
What were they trying to answer?
SPEAKER_00 (17:17):
Two very specific questions.
First, can these 15 clockspredict exceptional longevity,
which they defined as survivingto age 90?
And second, and far moreimportantly, can they predict
cognitively healthy longevity?
Meaning, can the clocks tell thedifference between someone who
survives to 90 with a sharpintact memory versus someone who
(17:39):
survives to 90 but suffers fromsevere dementia?
SPEAKER_01 (17:42):
Right.
What did they find?
SPEAKER_00 (17:43):
The first half of the findings were exactly what
you'd expect based on ourdiscussion of Grimmage.
The advanced second and thirdgeneration clocks, particularly
Grimmage 2 and Dundan Pace, werephenomenally accurate at
predicting who would physicallysurvive to age 90.
SPEAKER_01 (17:56):
So the body holds up.
SPEAKER_00 (17:58):
Right.
If your blood methylation showedaccelerated aging, your
statistical odds of reaching 90plummeted.
They predicted physicalmortality beautifully.
But out of all 15 clocks tested,including the ones designed to
look at intrinsic capacity,absolutely none of them could
predict if a woman would surviveto 90 with intact cognition
versus surviving with dementia.
SPEAKER_01 (18:19):
Wait, literally zero.
Like none of them could see thedementia coming.
SPEAKER_00 (18:23):
Zero.
The statistical odds ratios forsurviving to 90 with an intact
memory versus surviving to 90with dementia were virtually
indistinguishable across all theclocks.
The clocks are entirely blind toneurocognitive aging.
SPEAKER_01 (18:36):
So let me put this in practical terms.
I could go get my blood testedtomorrow.
My Grimmage comes back and says,Congratulations, your biological
age is 20 years younger thanyour driver's license.
Your heart is a machine.
You are going to easily live to100.
But that same test hasabsolutely no idea if my brain
is currently rotting inside myskull.
SPEAKER_00 (18:54):
That is the terrifying reality.
You could have thecardiovascular resilience of an
elite athlete ensuring yourphysical survival to a century,
while a completely undetectedcascade of neurodegeneration is
destroying your hippocampus.
SPEAKER_01 (19:07):
Honestly, what is the point?
What is the point of longevityscience or an immortality pill
if it just traps a fading mindinside a healthy body?
Why are these blood clocks soincredibly blind to the brain?
SPEAKER_00 (19:21):
It comes down to the fundamental architecture of the
human nervous system,specifically the blood-brain
barrier.
The epigenetic clocks wecurrently use are trained on and
tested using peripheral bloodsamples.
But the brain is an incrediblyisolated, highly privileged
immune environment.
SPEAKER_01 (19:38):
It has its own walled garden.
SPEAKER_00 (19:40):
Exactly.
The epigenetic changes happeningin the neurons, the astrocytes,
and the microglia, which are thebrain's immune cells, they do
not easily cross the blood-brainbarrier to show up in your
peripheral bloodstream.
SPEAKER_01 (19:50):
So the blood is telling a completely different
story than the cerebrospinalfluid.
SPEAKER_00 (19:54):
Precisely.
To truly track cognitive aging,we would need epigenetic clocks
trained on cerebrospinal fluid,which requires a spinal tap.
And that is not exactly ascalable routine diagnostic
test.
SPEAKER_01 (20:05):
Yeah, I'm not doing that at my annual physical.
SPEAKER_00 (20:08):
No one is.
This is why the field isdesperately shifting toward
precision gerontology.
The WIM study is a massivewake-up call that we have to
stop optimizing purely forlifespan and start developing
specific targeted biomarkers forhealth span, particularly brain
health.
SPEAKER_01 (20:24):
Okay, so if systemic epigenetic clocks can't predict
cognitive decline, what isactually driving it?
We know something has to bepulling the strings behind the
blood-brain barrier.
And when I was looking throughthe research on what actually
dictates whether you lose yourmemory or not, one specific gene
absolutely dominated the data.
We have to talk about APOE.
SPEAKER_00 (20:43):
Yes.
Epolipoprotein E.
If you want to understand thegenetics of sporadic Alzheimer's
disease and cognitive longevity,you must understand APOE.
It is the architect of thebrain's fate.
SPEAKER_01 (20:53):
Right.
So for you listening, let's laythis out.
APOE is a gene, and it comes inthree distinct flavors or
isoforms, right?
E2, E3, and E4.
SPEAKER_00 (21:01):
Correct.
You inherit one allele from eachparent, giving you your specific
genotype.
The E3E3 combination is by farthe most common in the
population.
It basically serves as thebaseline for normal human
cognitive aging.
But the variants, E2 and E4,drastically alter your
trajectory.
SPEAKER_01 (21:19):
And E4 is the bad one.
SPEAKER_00 (21:21):
Bad is an understatement.
Having just one copy of the E4allele, say URE3E4 increases
your risk of developing sporadicAlzheimer's disease by
approximately fourfold comparedto the baseline.
Wow.
And if you happen to inherit twocopies, an E4, E4 genotype, your
lifetime risk increases by up totwelvefold.
SPEAKER_01 (21:39):
Twelvefold.
I mean, that feels like agenetic death sentence.
That's practically a guaranteeyou're going to get Alzheimer's.
Conversely, though, the E2allele is the golden ticket,
right?
SPEAKER_00 (21:46):
It is highly neuroprotective.
Individuals with the E2 allelehave a significantly reduced
risk of Alzheimer's and areheavily overrepresented in
populations of centenarians whomaintain their cognitive
faculties.
SPEAKER_01 (21:58):
Okay, but why?
What is E2 already?
For physically doing inside thebrain that E2 isn't.
Because honestly, for years, theonly thing I ever heard about
Alzheimer's was amyloid plaques.
The amyloid hypothesis, it wasall about these sticky plaques
just gunking up the brain.
SPEAKER_00 (22:13):
It's true that the APOE protein is responsible for
binding and clearing amyloidbeta from the brain.
And the E4 isoform binds itdifferently, leading to faster
aggregation and slower clearanceof those plaques.
But recent research shows thatthe devastation of E4 goes far
beyond just amyloid.
It is vastly more insidious.
SPEAKER_01 (22:33):
Okay, bring it down.
What else is it doing?
SPEAKER_00 (22:34):
The presence of the E4 allele actively drives
tau-mediated neurodegeneration,the tangles inside the neurons
that actually kill the cell.
Furthermore, it causes severemicroglial dysfunction.
SPEAKER_01 (22:45):
Microelia, those are the immune genitors of the
brain, right?
They sweep up the dead cells anddebris.
SPEAKER_00 (22:50):
Exactly.
But in the presence of E4, thesejanitors become erratic and
highly inflammatory.
It also causes astrocytereactivity, essentially bathing
the brain tissue in a constantlow-grade inflammatory state.
And perhaps most structurallydamaging, the E4 allele leads to
the physical breakdown of theblood-brain barrier itself.
SPEAKER_01 (23:10):
Wait, the wall protecting the brain from
systemic toxins just starts toleak?
SPEAKER_00 (23:14):
Yes.
The tight junctions fail.
So note now peripheralinflammation and toxins can
flood directly into the braintissue, significantly
accelerating the decline.
SPEAKER_01 (23:23):
Okay, that is incredibly bleak.
If you are listening to this andyou know you have the APOE E4
gene, that sounds terrifying.
It sounds like absolute geneticfate.
Like you just drew the shortstraw and you just have to wait
for your brain to leak and catchfire.
But this is a deep dive onepigenetics, the software layer.
So, how much of this is actuallyfate?
SPEAKER_00 (23:41):
This is where the narrative shifts from despair to
incredible empowerment, becauseAPOE is absolutely not just
genetic fate.
The expression of the APO being,how loud it is shouting its
instructions into your brain, isheavily, heavily controlled by
epigenetics.
SPEAKER_01 (23:54):
Okay, bring us back to the molecular padlocks, the
methyl groups.
SPEAKER_00 (23:58):
Remember the CPG islands we discussed?
The dense clusters of cytosineand guanine where methylation
occurs?
Well, the regulatory region ofthe APOE gene is incredibly
dense with these CPG sites.
And here is the most fascinatingbiological quirk.
The sequence difference thatcreates the dangerous E4 allele
actually introduces more CPGsites into the gene compared to
(24:21):
E2 or E3.
SPEAKER_01 (24:22):
Wait, hold on.
Let me make sure I'm visualizingthis correctly.
The E4 allele, the dangerousone, has more physical spots for
methylation to occur.
SPEAKER_00 (24:29):
Exactly.
The E4 allele has the greatestnumber of CPG sites.
The protective E2 allele has theleast.
SPEAKER_01 (24:34):
Okay.
So if CPG sites are basicallythe volume dials for a gene, the
E2 allele is like a tiny littleradio without much of a volume
knob.
It just quietly plays itsprotective tune in the
background.
But the E4 allele has thismassive, highly sensitive,
multi-channel volume dial builtright into it.
SPEAKER_00 (24:50):
That is an absolutely brilliant metaphor,
yes.
Because it has so many CPGsites, the E4 allele is uniquely
susceptible to epigeneticregulation.
Its expression can be crankedall the way up to a 10, flooding
the brain with inflammation, orit can be heavily muted, dialed
down to a one or a two.
SPEAKER_01 (25:06):
And who turns the dial?
SPEAKER_00 (25:07):
You do.
Your environment, your lifestylechoices.
This is why we see such massiveclinical discordance, even among
people with the highest risk,the E4E4 carriers.
You will see one E4E4 individualdevelop severe Alzheimer's at
65.
You will see another E4E4individual remains cognitively
sharp until 85 or 90.
SPEAKER_01 (25:27):
They have the exact same hardware.
What explains a 20-yeardifference in brain survival?
SPEAKER_00 (25:31):
Epigenetic modifiers turning that massive volume
dial.
Environmental stimuli influenceDNA methylation gradually over
time.
Diet is a profound modifier.
Maintaining healthy lipidprofiles and a high intake of
polyunsaturated fatty acidsdirectly alters the methylation
patterns on the APOE promoter,turning the volume down on E4.
SPEAKER_01 (25:49):
What about exercise?
SPEAKER_00 (25:50):
Physical exercise physically alters the metabolic
response of the prefrontalcortex and hippocampus.
It induces the expression ofenzymes that add protective
methyl groups to the APOE gene,silencing the toxic downstream
effects.
SPEAKER_01 (26:04):
That is so profoundly empowering,
completely reframes genetics.
It's not, you know, you have thebad gene, game over.
It's you have a highly sensitivegene, so you need to manage your
software better than anyoneelse.
Your lifestyle choices areliterally physically reaching
into your brain and turning thevolume down on Alzheimer's.
SPEAKER_00 (26:22):
Exactly.
And beyond lifestyle, thescientific community is actively
trying to develop therapies thatmanipulate this software.
We're discovering entirely newlayers of epigenetic control,
like microRNAs.
SPEAKER_01 (26:34):
Right.
I read about this in the notes.
Mir 650, what is a microRNA?
SPEAKER_00 (26:38):
It's a tiny non-coding strand of RNA.
It doesn't build a protein.
Instead, it acts like aninterceptor missile.
The research showed that Mir 650specifically targets the
messenger RNA of the APOE geneand degrades it before it can
build the APOV protein.
It essentially gags the gene.
SPEAKER_01 (26:54):
So if we could figure out a way to deliver or
boost MIR-650 in the brain, wecould theoretically just hit the
mute button on the APOE E4 genealtogether.
SPEAKER_00 (27:03):
In vitro, it significantly reduces APOE
expression.
Translating that into a safehuman therapy that crosses the
blood-brain barrier is immenselycomplex.
But the proof of concept isthere.
We can intervene epigenetically.
SPEAKER_01 (27:16):
And speaking of intervening, there was also
mention of a literal genetherapy in the pipeline,
LEX1001.
SPEAKER_00 (27:22):
Yes, LEX1001 is a fascinating approach.
It uses an adeno-associatedviral vector, a hollowed out
virus that can't make you sickbut is excellent at sneaking
into cells.
They use this viral vector todeliver the protective APOE E2
allele directly into the centralnervous system of patients who
have the E4 genotype.
SPEAKER_01 (27:39):
Dude, they are literally using a virus as an
armored transport truck to dropthe golden ticket E2 gene into
the brain to fight the bad E4gene.
That is sci-fi level medicine.
SPEAKER_00 (27:49):
It is the cutting edge of neurogenetics,
attempting to artificiallychange the ratio of ApoE
isoforms in the brain to haltneurodegeneration.
SPEAKER_01 (27:56):
Okay, so we have viral gene therapy on the
horizon.
We have lifestyle choicesturning the epigenetic volume
dials.
But let's dig into the how ofthat lifestyle piece.
Because if my diet and myexercise dictate my APOE
expression, how does the cellactually know?
How does a neuron translate thefact that I skipped breakfast
into a molecular signal thatsays turn down APOE and start
(28:18):
repairing the DNA?
What is the physical messenger?
SPEAKER_00 (28:21):
To answer that, we really had to look at the master
regulator of cellular stress.
We had to look at the longevityswitch.
It is time to talk about FOXO3.
SPEAKER_01 (28:29):
FOXO3.
Okay, I know a bit about thelongevity pathways.
You hear about MTR, you hearabout autophagy, but FOXO3 seems
to be the absolute grandmasterof the cell's repair systems.
SPEAKER_00 (28:38):
If APOE is the architect of the brain's fate,
FOXO3 is the master architect ofcellular survival across the
entire body.
It is a transcription factor.
SPEAKER_01 (28:47):
Meaning its job is to go into the nucleus, bind to
the DNA, and turn genes on.
SPEAKER_00 (28:51):
Exactly.
The genes it turns on areincredible.
When FOC XO3 enters the nucleus,it activates a massive battery
of survival mechanisms, triggerscell cycle arrest, literally
telling a damaged cell to stopdividing before it becomes
cancerous.
Wow.
It upregulates DNA repairenzymes to fix mutations.
It activates antioxidantdefenses to clear out free
radicals.
(29:11):
And if the cell is too damagedto be saved, FOCXO3 triggers
apoptosis, programs cell deathfor the greater good of the
organism.
SPEAKER_01 (29:19):
It is the ultimate triage medic.
It assesses the damage anddictates survival.
But a medic that powerful can'tjust be running around the cell
turning things on and off allthe time, right?
SPEAKER_00 (29:27):
No.
That would be chaotic.
If FOXO3 is active all the time,the cell can never grow or
divide.
So FOCXO3 is kept underextraordinarily tight lock and
key.
It is heavily regulated bypost-translational
modifications.
SPEAKER_01 (29:40):
Because software patches again.
SPEAKER_00 (29:42):
Yes.
And what is most fascinating inthe recent research is a literal
physical molecular turf war thathappens on a single specific
amino acid on the FOXO3 protein.
We are looking at lysine 271.
SPEAKER_01 (29:54):
Okay, I was looking at the proteomics data here, and
this part is incredible.
Set the scene for us.
What is happening at lysine 271?
SPEAKER_00 (30:01):
We have two major enzymatic players competing for
control.
The first is CERT1.
Now, Cert 1 is a very famousanti-aging protein.
It belongs to a family calledCERTUINS.
It is a decetylus, meaning itremoves acetyl groups.
For years we knew that duringtimes of cellular stress, CERT1
removes an acetyl group fromFOLCOXO3, specifically at lysine
(30:21):
271.
This modification helps activateFOXO3.
SPEAKER_01 (30:25):
Right, and CERT1 is heavily dependent on NAD plus
IR, right, which connects it toenergy metabolism.
But then a new player enters thearena, SET 9.
SPEAKER_00 (30:34):
Exactly.
SET 9 is a methyltransferase.
Its entire biological purpose isto add methyl groups.
And it wants to methylate FOXO3.
And where does it want to putthat methyl group?
SPEAKER_01 (30:43):
The exact same spot.
Lysine 271.
They are literally fighting overthe exact same molecular parking
spot.
SPEAKER_00 (30:48):
They are competing directly.
Because of steric hindrancephysical crowding, they cannot
both modify lysine 271 at thesame time.
It is mutually exclusive.
If set 9 slaps a methyl group onthat lysine, CERT 1 is
physically blocked frominteracting with it.
SPEAKER_01 (31:01):
Okay, so if set 9 wins the fight and it methylates
lysine 271, what does thatactually physically do to the
FOXO3 protein?
SPEAKER_00 (31:09):
This is one of the most brilliant paradoxical
pieces of biological engineeringI have ever seen.
When set 9 methylates FOCOX3, itactually causes a conformational
change that decreases thephysical stability of the
protein.
The half-life of FOC XO3 dropssignificantly.
It is recognized by degradationmachinery and destroyed much
faster by the cell.
SPEAKER_01 (31:30):
Yeah, wait, it gets destroyed faster.
That sounds like a terriblething.
If FOXO3 is the medic and Set9destroys the medic, how does the
cell repair itself?
SPEAKER_00 (31:38):
You would absolutely think it was a negative outcome.
But here's the paradox.
While the methylation makes theprotein physically unstable and
short-lived, it simultaneouslymassively increases its
transcriptional activity.
SPEAKER_01 (31:49):
I'm sorry, what it is physically falling apart, but
it's working harder.
SPEAKER_00 (31:52):
Think of it like a biological overdrive gear or a
supernova.
The methylation by set 9 turnsFOXO3 into a highly active,
highly concentrated, but veryshort-lived burst of stress
response.
It enters the nucleus, binds tothe DNA, turns on the repair
genes with furious efficiency,and then, because it is
unstable, it gets degradedquickly.
SPEAKER_01 (32:13):
Oh, because if it didn't get degraded, the cell
would be permanently stuck intriage mode and could never go
back to growing.
SPEAKER_00 (32:19):
Exactly.
It prevents pathologicalpermanent cell cycle arrest.
It is an exquisite fine-tuningdial.
It allows for a massive,immediate response to stress,
followed by a rapid return tonormal cellular function once
the damage is cleared.
SPEAKER_01 (32:31):
That is just the sheer mechanical elegance of
that is breathtaking.
So the ultimate question for thelistener right now is how do we
manually reach into our cellsand trigger that supernova?
How do we flip the FOXO3 switchand tell it to start repairing
our DNA?
SPEAKER_00 (32:46):
The most robust, reliable, and evolutionarily
conserved way to activate FOXO3is through dietary restriction.
Or as it's more commonlypracticed, fasting.
SPEAKER_01 (32:54):
Right.
We all know fasting triggersrepair pathways.
Everyone in the longevity spacetalks about MTOR and autophagy
when you fast.
But what blew my mind in thesesources was the exact molecular
cascade, the physical messenger.
Walk us through the actualpathway.
I skipped breakfast.
What happens in the blood?
SPEAKER_00 (33:12):
When you restrict nutrients, specifically protein
and glucose, your body sensesthe deprivation.
Consequently, the circulatinglevels of a hormone called IGF1
insulin-like growth factor, onedrop significantly in your
bloodstream.
SPEAKER_01 (33:24):
Okay, IgF-1 drops.
How does the cell sense that?
SPEAKER_00 (33:27):
Your cells have IgF-1 receptors on their
surface.
When those receptors stopreceiving the IGF-1 signal, it
causes a cascading shutdown of amajor signaling highway inside
the cell called the ACTPKBpathway.
SPEAKER_01 (33:40):
ACT.
That's a kinase, right?
Meaning its job is tophosphorylate things, to slap
phosphate groups onto otherproteins.
SPEAKER_00 (33:46):
Aaron Powell Correct.
When you are well fed and IgF1is high, ACT is highly active.
And what ACT does isaggressively phosphorylate
FOXO3.
SPEAKER_01 (33:53):
Aaron Powell And what does adding a phosphate
group to FOXO3 do?
SPEAKER_00 (33:56):
Aaron Powell It creates a binding site for a
family of chaperone proteinscalled 1433 proteins.
These proteins physically grabthe phosphorylated FOXO3 and
drag it out of the nucleus,trapping it in the cytoplasm.
It literally locks the medic outof the hospital.
SPEAKER_01 (34:13):
Aaron Powell Because if you're eating a massive meal,
the cell is in growth mode.
It wants to divide and buildtissue.
It absolutely does not wantFXSO3 inside the nucleus
ceiling.
Stop growing, let's look for DNAmutations.
SPEAKER_00 (34:24):
Aaron Powell Precisely.
Growth and repair are mutuallyexclusive biological states.
You cannot do both optimally atthe same time.
But when you fast turns off.
SPEAKER_01 (34:33):
The phosphorylation stops.
SPEAKER_00 (34:34):
The lock breaks.
The 1433 proteins release FOXO3,and FOXO3 rushes back into the
nucleus, triggers the CERT1 andSET 9 dynamic, and initiates a
massive systemic cellular repairand cleanup process.
SPEAKER_01 (34:46):
I mean, the fact that the feeling of hunger, your
stomach growling, isfundamentally the exact same
biological signal as your DNAbeing scrubbed clean and your
epigenetic software beingoptimized.
You are literally leveraging anancient evolutionary survival
mechanism.
SPEAKER_00 (34:59):
You are.
In times of famine, a speciescannot afford to expend energy
on reproduction or tissuegrowth.
The organism must hunker down,repair existing cellular damage,
and survive until the foodsupply returns.
That deep evolutionary survivalpathway is the anti-aging
pathway.
SPEAKER_01 (35:16):
It makes so much sense.
But okay, listen, let me be thevoice of the average person
here.
Fasting is hard, people likefoods, skipping meals sucks.
So naturally, the entirebiomedical industry is asking
the same question.
Can we just take a pill to dothis?
Can we get the FOXO3 repair andthe APOE muting without the
hunger?
SPEAKER_00 (35:34):
Ah, the holy grail.
The quest for the fasting pillin a bottle.
This is the cutting edge oflongevity pharmacology testing
existing drugs against thesebiological classes to see if we
can chemically reverseepigenetic age.
SPEAKER_01 (35:45):
Right.
And everyone in the longevityspace is constantly debating the
big three (35:48):
metformin, caloric restriction, and rapamycin.
So let's talk about the pills.
What does metformin actually do?
SPEAKER_00 (35:54):
Metformin is primarily a type 2 diabetes
drug, but it has massivelongevity implications.
Mechanistically, it inhibitscomplex eye in the mitochondria,
which slightly restrictscellular energy production.
This drop in energy activates anenergy sensing enzyme called
AMPK.
SPEAKER_01 (36:12):
Which basically tricks the cell into thinking
it's starving, even if it isn't.
SPEAKER_00 (36:15):
Essentially, yes.
Activating AMPK triggersdownstream pathways that mimic
many of the effects of nutrientdeprivation, leading to improved
metabolic markers andpotentially delayed epigenetic
aging.
But the drug that generates themost excitement right now is
undoubtedly rapamycin.
SPEAKER_01 (36:31):
Rapamycin, yes, the crown jewel.
It physically inhibits MTOR,right, which is the mammalian
target of rapamycin.
And inhibiting MTOR basicallyforces the cell to stop growing
and start cleaning up, verysimilar to Evoxo3 activation.
People are taking this off labelright now.
I know people taking it.
They treat it like theimmortality pill.
SPEAKER_00 (36:47):
And here's where we must introduce a very dry, very
sobering scientific realitycheck.
Because the translation topharmacology from bench to
bedside is littered withfailures.
Rapamycin is fundamentally animmunosuppressant.
Now, the excitement is warrantedbased on early data.
In mice, when researchersadministered rapamycin for 22
(37:07):
months, it significantlydecreased their DNA methylation
epigenetic age compared to thecontrol group.
It was a staggering success.
SPEAKER_01 (37:14):
A massive success in mice, but I can hear the butt in
your voice.
What happened next?
SPEAKER_00 (37:20):
The researchers took the next logical step.
They moved from short-livedrodents to long-lived primates.
They tested rapamycin on acohort of common marmosets.
SPEAKER_01 (37:27):
Marmosets, which are evolutionarily much closer to
us.
Their biology, their metabolismis vastly more similar to a
human than a mouse's.
SPEAKER_00 (37:35):
Exactly.
They treated these marmosetswith daily rapamycin for over
two years, a very robustlongitudinal study.
As a result, rumroll.
Rapamycin administration did notsignificantly change their DNA
methylation epigenetic age.
SPEAKER_01 (37:47):
Oh wow.
Nothing.
No biological time travel forthe monkeys.
SPEAKER_00 (37:50):
No significant epigenetic age reversal
whatsoever.
SPEAKER_01 (37:53):
Why?
If it works so perfectly in amouse, why does it completely
fail to change the epigeneticclock in a primate?
SPEAKER_00 (38:00):
Because of the profound complexity of primate
metabolic compensation.
Mice are short-lived, fastmetabolism organisms.
Their biological pathways areessentially a straight line.
You block MTOR, the systemshifts immediately to repair.
But primates, humans included,are designed for extreme
longevity already.
We have highly complex,redundant feedback loops.
SPEAKER_01 (38:21):
So they fight back.
SPEAKER_00 (38:22):
Yes.
When you artificially suppressMTOR in a primate with a drug,
the body senses the chemicalblockage and simply reroutes.
It upregulates compensatorypathways to maintain its
biological equilibrium.
SPEAKER_01 (38:33):
So the primate body basically says, nice try with
the rapamycin, but I have abackup system and a backup for
the backup, and we're going tokeep aging normally.
SPEAKER_00 (38:41):
Precisely.
It is a vital reminder of thefundamental rule of longevity
science.
Mice are not tiny humans.
And mice are certainly not tinymarmosets.
We are making unbelievablestrides in understanding the
mechanisms of aging.
We understand FOC XO3, weunderstand APOE, we understand
the methylation clocks, butwe're absolutely not at the
(39:02):
immortality pill in a bottlestage.
Biology and long-lived primatesis stubbornly resilient.
SPEAKER_01 (39:08):
Honestly, that is a bummer for the people popping
off label pills, but it is suchan important point.
It means I can't just eatdonuts, avoid the gym, pop a
lapomycin, and expect mygrimmage to say I'm 20.
The lifestyle stuff, thefasting, the exercise, the
sleep, it still holds the crownbecause it triggers the entire
systemic symphony of pathways,not just one isolated protein.
SPEAKER_00 (39:28):
It does.
The most effectivescientifically validated
epigenetic modifiers wecurrently have access to are
behavioral and dietary.
You have to earn the epigeneticreversal.
SPEAKER_01 (39:36):
Okay.
Let's pull all of this togetherbecause we have covered an
insane amount of molecularground today.
Let's summarize the journey.
We started with the physicalreality of the epigenome, the
methylation rust on our DNA.
SPEAKER_00 (39:47):
The steric hindrance of methyl groups silencing our
genes, and the realization thatthis process is so
mathematically predictable thatwe can build epigenetic clocks
like grimmage to read ourbiological decay, proving that
chronological age is comforting,but biological age is the actual
receipt.
SPEAKER_01 (40:03):
Then we met the superagers, the centenarians who
are biologically decades youngerthan their birth certificates,
who prove that epigenetic drift,the chaotic noise of aging,
isn't inevitable for everyone.
And we saw that we can actuallypick the padlocks off the genes,
like curing blindness in mice bysimply turning the ELVL2 gene
back on.
SPEAKER_00 (40:23):
But we also confronted the cognitive blind
spot through the WIM study.
The terrifying reality that oursystemic blood clocks can
predict when your heart willfail, but are utterly blind to
the epigenetic neurodegenerationhappening behind the blood brain
barrier.
SPEAKER_01 (40:38):
Which led us to APOE, the architect of that
brain decline.
And the realization that even ifyou carry the massive risk of
the E4 allele, the fact that ithas so many CPG sites makes it a
highly sensitive volume dial.
Your lifestyle is the handturning that dial down.
SPEAKER_00 (40:52):
And finally, we explored the mechanical elegance
of FAXO3, the molecular turf warat lysine 271, and the beautiful
realization that the simple actof experiencing hunger drops
your IGF-1, breaks the ACT lock,and sends a burst of repair
proteins into your nucleus toscrub your DNA clean.
SPEAKER_01 (41:12):
It fundamentally changes how you look at yourself
in the mirror.
You are not a static machinewith a fixed odometer.
You are a dynamic, highlyresponsive biological software
system.
SPEAKER_00 (41:23):
Which leaves us with a highly provocative final
thought to consider.
We have spent all of humanhistory, our art, our
philosophy, our economicsystems, assuming that aging and
decay are inevitable,untreatable conditions.
Life has always been a one-wayarrow of time.
Right.
But if aging is actually just abiochemical software program
governed by reversiblemethylation, and we are actively
learning how to rewrite thatcode, what happens to human
(41:44):
psychology?
What happens to ambition, torelationships, to the structure
of society as a whole whenrunning out of time is no longer
the default foundationalassumption of human existence.
SPEAKER_01 (41:56):
Yeah.
SPEAKER_00 (41:56):
What do you do with your life when the biological
odometer is suddenly meaninglessand your cellular Carfax report
says you have the capacity todrive for another century?
SPEAKER_01 (42:06):
Dude, I I don't even know how to process that.
That completely changes thestakes of everything.
I am going to be thinking aboutthat all week.
All right.
That is our deep dive for today.
Keep your biological softwareupdated, embrace a little bit of
hunger, stay curious, and we'llsee you next time.
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