Histone deacetylases 9 and 10 are required for homologous recombination

Shweta Kotian, Sandhya Liyanarachchi, Arthur Zelent, Jeffrey D. Parvin

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


We tested the role of histone deacetylases (HDACs) in the homologous recombination process. A tissue-culture based homology-directed repair assay was used in which repair of a double-stranded break by homologous recombination results in gene conversion of an inactive GFP allele to an active GFP gene. Our rationale was that hyperacetylation caused by HDAC inhibitor treatment would increase chromatin accessibility to repair factors, thereby increasing homologous recombination. Contrary to expectation, treatment of cells with the inhibitors significantly reduced homologous recombination activity. Using RNA interference to deplete each HDAC, we found that depletion of either HDAC9 or HDAC10 specifically inhibited homologous recombination. By assaying for sensitivity of cells to the interstrand cross-linker mitomycin C, we found that treatment of cells with HDAC inhibitors or depletion of HDAC9 or HDAC10 resulted in increased sensitivity to mitomycin C. Our data reveal an unanticipated function of HDAC9 and HDAC10 in the homologous recombination process.

Original languageEnglish (US)
Pages (from-to)7722-7726
Number of pages5
JournalJournal of Biological Chemistry
Issue number10
StatePublished - Mar 11 2011
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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