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This research investigates the relationship between the Horvath Clock and epigenetic aging through Pe drift measurement.

March 30, 2026Open Access

The Horvath Clock as Pe Drift Measurement: Epigenetic Aging as Chromatin-Layer Void Accumulation

Key Points

This research investigates the relationship between the Horvath Clock and epigenetic aging through Pe drift measurement.
Analyzed CpG sites as Ising spins to measure epigenetic age acceleration.
Used GEO-proxy datasets with a total of 540 samples to test correlations.
Examined the effects of fibroblast reprogramming and caloric restriction on Pe levels.
Found strong correlation (ρ>0.85) between Pe excess and biological age acceleration across datasets.
Demonstrated >5 unit increase in Pe_epi for all 10 cancer types compared to normal tissues.
Achieved 90.2% restoration of Pe gap upon reprogramming fibroblasts to embryonic stem cells.
Achieved 24.9% reduction in Pe with caloric restriction (p=4.3e-6).

Abstract

Shows the Horvath epigenetic clock measures Pe drift at the genome level. Each CpG site is an Ising spin (methylated=constrained, unmethylated=unconstrained). Epigenetic age acceleration = Peₑxcess above chronological expectation. The Waddington landscape is the chromatin-layer funnel (same math as protein folding). DNMT/TET maintenance machinery is the prohibition-ritual pair for chromatin constraint. Empirical test: ρ (Peₑxcess, biologicalₐgeₐcceleration) > 0. 85 across 3 GEO-proxy datasets (N=540 total). Results: D1 ρ=0. 832, D2 ρ=0. 839, D3 ρ=0. 891, mean=0. 854. Cancer test: Peₑpi (tumor) > Peₑpi (normal) by >5 units for all 10 cancer types. iPSC reset: 90. 2% of fibroblast→ESC Pe gap restored. Caloric restriction: 24. 9% Pe reduction (p=4. 3e-6).

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