Ontology type: schema:ScholarlyArticle Open Access: True
2014-02
AUTHORSHelen Pemberton, Emma Anderton, Harshil Patel, Sharon Brookes, Hollie Chandler, Richard Palermo, Julie Stock, Marc Rodriguez-Niedenführ, Tomas Racek, Lucas de Breed, Aengus Stewart, Nik Matthews, Gordon Peters
ABSTRACTBACKGROUND: Polycomb group proteins form multicomponent complexes that are important for establishing lineage-specific patterns of gene expression. Mammalian cells encode multiple permutations of the prototypic Polycomb repressive complex 1 (PRC1) with little evidence for functional specialization. An aim of this study is to determine whether the multiple orthologs that are co-expressed in human fibroblasts act on different target genes and whether their genomic location changes during cellular senescence. RESULTS: Deep sequencing of chromatin immunoprecipitated with antibodies against CBX6, CBX7, CBX8, RING1 and RING2 reveals that the orthologs co-localize at multiple sites. PCR-based validation at representative loci suggests that a further six PRC1 proteins have similar binding patterns. Importantly, sequential chromatin immunoprecipitation with antibodies against different orthologs implies that multiple variants of PRC1 associate with the same DNA. At many loci, the binding profiles have a distinctive architecture that is preserved in two different types of fibroblast. Conversely, there are several hundred loci at which PRC1 binding is cell type-specific and, contrary to expectations, the presence of PRC1 does not necessarily equate with transcriptional silencing. Interestingly, the PRC1 binding profiles are preserved in senescent cells despite changes in gene expression. CONCLUSIONS: The multiple permutations of PRC1 in human fibroblasts congregate at common rather than specific sites in the genome and with overlapping but distinctive binding profiles in different fibroblasts. The data imply that the effects of PRC1 complexes on gene expression are more subtle than simply repressing the loci at which they bind. More... »
PAGESr23
http://scigraph.springernature.com/pub.10.1186/gb-2014-15-2-r23
DOIhttp://dx.doi.org/10.1186/gb-2014-15-2-r23
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/24485159
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