Sin3a is essential for the genome integrity and viability of pluripotent cells

P McDonel, Jeroen Demmers, DWM Tan, F Watt, BD Hendrich

Research output: Contribution to journalArticleAcademicpeer-review

38 Citations (Scopus)

Abstract

The Sin3a/HDAC co-repressor complex is a critical regulator of transcription networks that govern cell cycle control and apoptosis throughout development. Previous studies have identified Sin3a as essential for embryonic development around the time of implantation, during which the epiblast cell cycle is uniquely structured to achieve very rapid divisions with little tolerance of DNA damage. This study investigates the specific requirement for Sin3a in the early mouse embryo and shows that embryos lacking Sin3a suffer unresolved DNA damage and acute p53-independent apoptosis specifically in the E3.5-4.5 epiblast. Surprisingly, Myc and E2F targets in Sin3a-null ICMs are downregulated, suggesting a central but non-canonical role for Sin3a in regulating the pluripotent embryonic cell cycle. ES cells deleted for Sin3a mount a DNA damage response indicative of unresolved double-strand breaks, profoundly arrest at G2, and undergo apoptosis. These results indicate that Sin3a protects the genomic integrity of pluripotent embryonic cells and governs their unusual cell cycle. (C) 2011 Elsevier Inc. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)62-73
Number of pages12
JournalDevelopmental Biology
Volume363
Issue number1
DOIs
Publication statusPublished - 2012

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