The activity of early-life gene regulatory elements is hijacked in aging through pervasive AP-1-linked chromatin opening

Cell Metab. 2024 Aug 6;36(8):1858-1881.e23. doi: 10.1016/j.cmet.2024.06.006. Epub 2024 Jul 2.

Abstract

A mechanistic connection between aging and development is largely unexplored. Through profiling age-related chromatin and transcriptional changes across 22 murine cell types, analyzed alongside previous mouse and human organismal maturation datasets, we uncovered a transcription factor binding site (TFBS) signature common to both processes. Early-life candidate cis-regulatory elements (cCREs), progressively losing accessibility during maturation and aging, are enriched for cell-type identity TFBSs. Conversely, cCREs gaining accessibility throughout life have a lower abundance of cell identity TFBSs but elevated activator protein 1 (AP-1) levels. We implicate TF redistribution toward these AP-1 TFBS-rich cCREs, in synergy with mild downregulation of cell identity TFs, as driving early-life cCRE accessibility loss and altering developmental and metabolic gene expression. Such remodeling can be triggered by elevating AP-1 or depleting repressive H3K27me3. We propose that AP-1-linked chromatin opening drives organismal maturation by disrupting cell identity TFBS-rich cCREs, thereby reprogramming transcriptome and cell function, a mechanism hijacked in aging through ongoing chromatin opening.

Keywords: AP-1; CTCF; aging; cell identity; chromatin; development; maturation; polycomb repressive complex 2; redistribution; transcription factors.

MeSH terms

  • Aging* / genetics
  • Aging* / metabolism
  • Animals
  • Binding Sites
  • Chromatin* / metabolism
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Transcription Factor AP-1* / metabolism

Substances

  • Transcription Factor AP-1
  • Chromatin