Hypothesis: Telomere length reflects the informational entropy of chromatin states, and AAV-delivered TERT reduces this entropy by restoring telomeric repeat-mediated heterochromatin buffering, thereby lowering transcriptional noise and delaying age-related functional decline. We predict that systemic administration of an immunologically silenced AAV9-TERT vector (AAV9 S671A) will decrease chromatin entropy in multiple tissues, measurable as a reduction in Shannon entropy of ATAC-seq or methylation profiles, and that this epigenetic change will correlate with improved healthspan metrics. If entropy does not decline despite telomere lengthening, the hypothesis is falsified.

Mechanistic basis: Telomeric repeats recruit HP1, SUV39H1 and other repressive complexes that sequester transcription factors and chromatin remodelers, creating a sink that dampens stochastic fluctuations in gene expression. As telomeres shorten, this buffering capacity erodes, increasing the entropy of the epigenetic landscape and promoting noisy, aberrant transcription that drives cellular dysfunction. Restoring telomeric repeats via TERT expression should reinstate the heterochromatic sink, lowering entropy and stabilizing transcriptional programs.

Experimental design: Use aged C57BL/6 mice (24 months). Four groups: (1) saline control, (2) AAV9 S671A-GFP control, (3) AAV9 S671A-TERT low dose (1e11 vg), (4) AAV9 S671A-TERT high dose (5e11 vg). Vectors are produced using the capsid engineering approaches described in [2] and [3] to ensure reduced immunogenicity and enable repeat dosing if needed. Administer via tail‑vein injection. Four weeks post‑dose, harvest liver, brain, skeletal muscle and blood. Assess telomere length by qFISH, chromatin entropy by calculating Shannon entropy from ATAC‑seq peak intensity distributions or methylation beta‑value variance, and transcriptional noise by single‑cell RNA‑seq Fano factor measurements. Healthspan readouts include grip strength, treadmill endurance, spontaneous activity and cognitive testing (novel object recognition).

Predictions and falsifiability: The high‑dose TERT group will show significantly longer telomeres versus controls, accompanied by a measurable decrease in chromatin entropy across tissues (p<0.01, effect size >0.5). This entropy reduction will correlate with improved grip strength and endurance (r>0.6). If telomere lengthens but entropy remains unchanged or increases, the hypothesis is falsified. Conversely, if entropy drops without telomere elongation (e.g., due to off‑target effects), the hypothesis would need revision but not outright falsification, prompting further mechanistic probes.

Impact: Linking telomere biology to information theory provides a concrete, quantifiable biomarker (epigenetic entropy) for evaluating AAV‑based gene therapies targeting aging. It also guides vector selection: AAV9’s broad CNS and peripheral tropism [1] makes it ideal for systemic entropy reduction, while liver‑detargeted variants could isolate tissue‑specific effects. Demonstrating that TERT-mediated telomere restoration lowers biological noise would substantiate the view of aging as a thermodynamic consequence of information loss in biological computation, opening new avenues for preventive interventions.