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Nucleic Acids Res. 2016 Mar 18;44(5):2136-44. doi: 10.1093/nar/gkv1223. Epub 2015 Nov 17.

RING1A and BMI1 bookmark active genes via ubiquitination of chromatin-associated proteins.

Author information

1
Department of Biomedical Informatics, OSU Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA.
2
Department of Biomedical Informatics, OSU Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA Jeffrey.Parvin@osumc.edu.

Abstract

During mitosis the chromatin undergoes dramatic architectural changes with the halting of the transcriptional processes and evacuation of nearly all transcription associated machinery from genes and promoters. Molecular bookmarking of genes during mitosis is a mechanism of faithfully transmitting cell-specific transcription patterns through cell division. We previously discovered chromatin ubiquitination at active promoters as a potential mitotic bookmark. In this study, we identify the enzymes involved in the deposition of ubiquitin before mitosis. We find that the polycomb complex proteins BMI1 and RING1A regulate the ubiquitination of chromatin associated proteins bound to promoters, and this modification is necessary for the expression of marked genes once the cells enter G1. Depletion of RING1A, and thus inactivation of mitotic bookmarking by ubiquitination, is deleterious to progression through G1, cell survival and proliferation. Though the polycomb complex proteins are thought to primarily regulate gene expression by transcriptional repression, in this study, we discover that these two polycomb proteins regulate the transcription of active genes during the mitosis to G1 transition.

PMID:
26578590
PMCID:
PMC4797268
DOI:
10.1093/nar/gkv1223
[Indexed for MEDLINE]
Free PMC Article

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