Tip60-mediated H2A.Z acetylation promotes neuronal fate specification and bivalent gene activation

Justyna A. Janas, Lichao Zhang, Jacklyn H. Luu, Janos Demeter, Lingjun Meng, Samuele G. Marro, Moritz Mall, Nancie A. Mooney, Katie Schaukowitch, Yi Han Ng, Nan Yang, Yuhao Huang, Gernot Neumayer, Or Gozani, Joshua E. Elias, Peter K. Jackson, Marius Wernig

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Cell lineage specification is accomplished by a concerted action of chromatin remodeling and tissue-specific transcription factors. However, the mechanisms that induce and maintain appropriate lineage-specific gene expression remain elusive. Here, we used an unbiased proteomics approach to characterize chromatin regulators that mediate the induction of neuronal cell fate. We found that Tip60 acetyltransferase is essential to establish neuronal cell identity partly via acetylation of the histone variant H2A.Z. Despite its tight correlation with gene expression and active chromatin, loss of H2A.Z acetylation had little effect on chromatin accessibility or transcription. Instead, loss of Tip60 and acetyl-H2A.Z interfered with H3K4me3 deposition and activation of a unique subset of silent, lineage-restricted genes characterized by a bivalent chromatin configuration at their promoters. Altogether, our results illuminate the mechanisms underlying bivalent chromatin activation and reveal that H2A.Z acetylation regulates neuronal fate specification by establishing epigenetic competence for bivalent gene activation and cell lineage transition.

Original languageEnglish
Pages (from-to)4627-4646.e14
JournalMolecular Cell
Volume82
Issue number24
DOIs
StatePublished - 15 Dec 2022
Externally publishedYes

Keywords

  • Ascl1
  • H2A.Z acetylation
  • H3K4me3
  • Tip60/Kat5
  • bivalent chromatin
  • cell fate
  • gene activation
  • neurogenesis
  • reprogramming
  • transcription

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