The NuRD Sink and Photonic Rewiring: A Systems-Level Hypothesis of Epigenetic Recovery

This work presents a systems-level theoretical framework integrating epigenetics, immunometabolism, and bioenergetics to explain immune silencing in chronic disease. The NuRD Sink Hypothesis proposes that persistent infections, malignancies, and aging-associated inflammaging converge on a shared mechanism: pathological sequestration of the Nucleosome Remodeling and Deacetylase (NuRD) complex at immune defense loci, leading to durable chromatin repression, retrotransposon derepression, and genomic instability. Building on this model, the manuscript introduces Photonic Rewiring, a hypothesis in which 670 nm photobiomodulation (PBM) acts as a metabolic trigger that elevates mitochondrial NAD⁺ levels and activates SIRT1/3. This metabolic–epigenetic coupling is proposed to antagonize NuRD-dominated repression and restore chromatin accessibility at immune surveillance pathways, including the cGAS–STING axis. A stabilizing NAMPT-mediated NAD⁺ salvage loop is further hypothesized to sustain this compensated state beyond the initial photonic stimulus. This manuscript is intended as a conceptual and hypothesis-generating contribution rather than a clinical claim. It provides a unifying framework and explicit mechanistic predictions to stimulate experimental investigation across epigenetics, systems biology, immunology, and bioenergetics.