Chromosome Y pericentric heterochromatin is a primary target of HSF1 in male cells

Jessica Penin, Solenne Dufour, Virginie Faure, Sabrina Fritah, Daphné Seigneurin-Berny, Edwige Col, André Verdel*, Claire Vourc’h

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

The heat shock factor 1 (HSF1)-dependent transcriptional activation of human pericentric heterochromatin in heat-shocked cells is the most striking example of transcriptional activation of heterochromatin. Until now, pericentric heterochromatin of chromosome 9 has been identified as the primary target of HSF1, in both normal and tumor heat-shocked cells. Transcriptional awakening of this large genomic region results in the nuclear accumulation of satellite III (SATIII) noncoding RNAs (ncRNAs) and the formation in cis of specific structures known as nuclear stress bodies (nSBs). Here, we show that, in four different male cell lines, including primary human fibroblasts and amniocytes, pericentric heterochromatin of chromosome Y can also serve as a unique primary site of HSF1-dependent heterochromatin transcriptional activation, production of SATIII ncRNA, and nucleation of nuclear stress bodies (nSBs) upon heat shock. Our observation suggests that the chromosomal origin of SATIII transcripts in cells submitted to heat shock is not a determinant factor as such, but that transcription of SATIII repetitive units or the SATIII ncRNA molecules is the critical element of HSF1-dependent transcription activation of constitutive heterochromatin.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalChromosoma
Volume130
Issue number1
DOIs
Publication statusPublished - Mar 2021

Keywords

  • HSF1
  • Heterochromatin
  • Human
  • nSB
  • ncRNA

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