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The mammalian DREAM complex is responsible for the transcriptional repression of hundreds of cell-cycle-related genes in quiescence. How the DREAM complex recruits chromatin-modifying entities to aid in its repression remains unknown. Using unbiased proteomics analysis, we have uncovered a robust association between the chromatin-associated Sin3B protein and the DREAM complex. We have determined that genetic inactivation of Sin3B results in the de-repression of DREAM target genes during quiescence but is insufficient to allow quiescent cells to resume proliferation. However, inactivation of APC/CCDH1 was sufficient for Sin3B-/- cells, but not parental cells, to re-enter the cell cycle. These studies identify Sin3B as a transcriptional corepressor associated with the DREAM complex in quiescence and reveals a functional cooperation between E2F target repression and APC/CCDH1 in the negative regulation of cell-cycle progression.
Pubmed ID: 30517867 RIS Download
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