PMID- 24793759 OWN - NLM STAT- MEDLINE DCOM- 20150110 LR - 20220408 IS - 1862-1783 (Electronic) IS - 1673-1581 (Print) IS - 1673-1581 (Linking) VI - 15 IP - 5 DP - 2014 May TI - Epigenetic regulation by polycomb group complexes: focus on roles of CBX proteins. PG - 412-28 LID - 10.1631/jzus.B1400077 [doi] AB - Polycomb group (PcG) complexes are epigenetic regulatory complexes that conduct transcriptional repression of target genes via modifying the chromatin. The two best characterized forms of PcG complexes, polycomb repressive complexes 1 and 2 (PRC1 and PRC2), are required for maintaining the stemness of embryonic stem cells and many types of adult stem cells. The spectra of target genes for PRCs are dynamically changing with cell differentiation, which is essential for proper decisions on cell fate during developmental processes. Chromobox (CBX) family proteins are canonical components in PRC1, responsible for targeting PRC1 to the chromatin. Recent studies highlight the function specifications among CBX family members in undifferentiated and differentiated stem cells, which reveal the interplay between compositional diversity and functional specificity of PRC1. In this review, we summarize the current knowledge about targeting and functional mechanisms of PRCs, emphasizing the recent breakthroughs related to CBX proteins under a number of physiological and pathological conditions. FAU - Ma, Rong-gang AU - Ma RG AD - School of Life Sciences, Lanzhou University, Lanzhou 730000, China. FAU - Zhang, Yang AU - Zhang Y FAU - Sun, Ting-ting AU - Sun TT FAU - Cheng, Bo AU - Cheng B LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - China TA - J Zhejiang Univ Sci B JT - Journal of Zhejiang University. Science. B JID - 101236535 RN - 0 (Chromatin) RN - 0 (Polycomb-Group Proteins) SB - IM MH - Animals MH - Chromatin/*genetics MH - Chromatin Assembly and Disassembly/*genetics MH - Epigenesis, Genetic/*genetics MH - Gene Expression Regulation/*genetics MH - Genes, Homeobox/*genetics MH - Humans MH - Polycomb-Group Proteins/*genetics MH - Transcription, Genetic/*genetics PMC - PMC4076598 OTO - NOTNLM OT - Cancer OT - Chromobox (CBX) protein OT - Epigenetic regulation OT - Polycomb OT - Polycomb repressive complex 1 (PRC1) COIS- Compliance with ethics guidelines: Rong-gang MA, Yang ZHANG, Ting-ting SUN, and Bo CHENG declare that they have no conflict of interest. This article does not contain any studies with human or animal subjects performed by any of the authors. EDAT- 2014/05/06 06:00 MHDA- 2015/01/13 06:00 PMCR- 2014/05/01 CRDT- 2014/05/06 06:00 PHST- 2014/05/06 06:00 [entrez] PHST- 2014/05/06 06:00 [pubmed] PHST- 2015/01/13 06:00 [medline] PHST- 2014/05/01 00:00 [pmc-release] AID - 10.1631/jzus.B1400077 [doi] PST - ppublish SO - J Zhejiang Univ Sci B. 2014 May;15(5):412-28. doi: 10.1631/jzus.B1400077.