New paper
@Nature analyzing 11,000 profiles of cellular gene expression provides further evidence that aging is not just wear & tear but a reversible loss of epigenetic information linked directly to mortality risk
Reprogramming, embryogenesis & young blood partially reversed aging signals. Why is this important?
The work implies that the youthful state of tissues is not lost permanently during aging.
It can be restored
The work is also the strongest systems-level support yet for the idea that aging is not just random wear and tear, but a coordinated and reversible loss of biological information.
In many ways, it strengthens the Information Theory of Aging (ITOA), which we first formulated back in 2008-2009.
The striking thing is not simply that damage accumulates. It is that cells enter a coordinated transcriptional state associated with mortality risk, which strongly argues aging is an organized systems phenomenon. This is exactly what you would expect if cells progressively lose youthful epigenetic control information.
The work by the Gladyshev lab
@harvardmed (no link to us) suggests aging is not a collection of unrelated damage. It behaves more like an attractor state.Cells under many forms of stress drift toward a common aged configuration.
That is deeply compatible with the idea that epigenetic information loss causes cells to progressively collapse due to informational noise. We call this process epigenetic drift, leading to ex-differentiation.
One of the most important aspects is that it links aging directly to mortality risk rather than simply chronological time. Prof Gladyshev and team developed transcriptomic clocks that don’t just estimate age, they measure the progressive loss of cellular function and predict biological decline and mortality risk across mammals.
That is a major advance because it brings us closer to measuring the underlying process of aging itself, not just the passage of time, in a way first shown by Prof. Steven Horvath in 2013.
The team also launched TACO (Transcriptomic Age Calculator Online) allowing researchers to estimate the biological age and mortality risk of tissues using RNA data they may already have. A potentially powerful new tool for aging research
What I find especially important is that the strongest mortality-associated changes involve chromatin organization, epigenetic regulation, inflammation, and mitochondrial dysfunction.
These are all deeply connected to the maintenance of cellular identity and the preservation of biological information over time.
The study strongly supports the idea that aging is not merely the accumulation of damage, but a progressive loss of the systems that maintain youthful cellular organization.
In many ways, this aligns with the Information Theory of Aging, which proposes that cells lose epigenetic information over time but retain a backup copy that can potentially be restored.
Importantly, the paper also confirms that these molecular signatures are reversible, which we and others have previously shown.
They accelerate after DNA damage, and during disease and stress, but slow or reverse during interventions such as reprogramming, heterochronic parabiosis, and early embryogenesis.
That gives real hope that aging is biologically malleable & perhaps, one day, medically treatable 🙏
Thanks for reading all the way down. I gave this whole analysis to a reporter and my quote was 2 words: "Major advance" 😆
So we can all stay abreast of this fast paced field,
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