Longevity & AgingFour Failing Chromatin Systems May Drive Aging and Point to New Epigenetic Therapies
Epigenetic changes with age are well documented, but how they fit together has been unclear. This Nature Reviews Molecular Cell Biology article from Yücel and Gladyshev offers a systems-level framework in which aging reflects the progressive loss of epigenetic fidelity, meaning the ability of chromatin regulators to hold precise gene expression states. The authors describe four interdependent processes: breakdown of nuclear architecture (including lamina-associated domains), disrupted epigenetic memory via complexes such as PRC2, nucleosome changes including replication-independent buildup of histone variant H3.3, and transcription factor-driven reprogramming. Because these processes regulate one another, failures can cascade. The authors argue this explains why epigenetic interventions show consistent effects across models and aging traits, and they propose designing therapies that target whole epigenetic systems rather than single molecular defects.
