Retargeting of macroH2A following mitosis to cytogenetic-scale heterochromatic domains

Hanae Sato, Bin Wu, Fabien Delahaye, Robert H. Singer, John M. Greally

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The heritability of chromatin states through cell division is a potential contributor to the epigenetic maintenance of cellular memory of prior states. The macroH2A histone variant has properties of a regulator of epigenetic cell memory, including roles controlling gene silencing and cell differentiation. Its mechanisms of regional genomic targeting and maintenance through cell division are unknown. Here, we combined in vivo imaging with biochemical and genomic approaches to show that human macroH2A is incorporated into chromatin in the G1 phase of the cell cycle following DNA replication. The newly incorporated macroH2A retargets the same large heterochromatic domains where macroH2A was already enriched in the previous cell cycle. It remains heterotypic, targeting individual nucleosomes that do not already contain a macroH2A molecule. The pattern observed resembles that of a new deposition of centromeric histone variants during the cell cycle, indicating mechanistic similarities for macrodomain-scale regulation of epigenetic properties of the cell.

Original languageEnglish (US)
Pages (from-to)1810-1823
Number of pages14
JournalJournal of Cell Biology
Issue number6
StatePublished - Jun 3 2019

ASJC Scopus subject areas

  • Cell Biology


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