The DREAM complex links somatic mutation, lifespan, and disease

Area of Science:

• Genetics
• Molecular Biology
• Aging Research

Background:

• The DREAM complex is a known repressor of DNA repair.
• Its long-term effects on human health and aging are not well understood.

Purpose of the Study:

• To investigate the impact of DREAM complex activity on somatic mutation burden, lifespan, and age-related diseases.
• To determine if DREAM complex activity is a key regulator of aging.

Main Methods:

• Joint profiling of DREAM activity and somatic mutations in a single-cell atlas of 21 mouse tissues.
• Correlation analysis of DREAM activity with lifespan across 92 mammalian species.
• Analysis of DREAM activity in Alzheimer's patients.
• In vivo study of DREAM knockout mice to assess mutation accumulation.

Main Results:

• Cellular niches with lower DREAM activity exhibited decreased mutation rates.
• Lower DREAM activity was associated with longer lifespans in mammals.
• Reduced DREAM activity in Alzheimer's patients correlated with later disease onset and less severe neuropathology.
• DREAM knockout in mice reduced single-base substitutions by 4.2% and indels by 19.6% in the brain.

Conclusions:

• DREAM complex activity significantly influences lifetime somatic mutation burden.
• DREAM activity is linked to lifespan and age-related disease pathology.
• The DREAM complex is positioned as a key regulator of the aging process.