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Alliance"],"published-print":{"date-parts":[[2023,10]]},"abstract":"<jats:p>Polycomb repressive complex 1 (PRC1) strongly influences 3D genome organization, mediating local chromatin compaction and clustering of target loci. Several PRC1 subunits have the capacity to form biomolecular condensates through liquid\u2013liquid phase separation in vitro and when tagged and over-expressed in cells. Here, we use 1,6-hexanediol, which can disrupt liquid-like condensates, to examine the role of endogenous PRC1 biomolecular condensates on local and chromosome-wide clustering of PRC1-bound loci. Using imaging and chromatin immunoprecipitation, we show that PRC1-mediated chromatin compaction and clustering of targeted genomic loci\u2014at different length scales\u2014can be reversibly disrupted by the addition and subsequent removal of 1,6-hexanediol to mouse embryonic stem cells. Decompaction and dispersal of polycomb domains and clusters cannot be solely attributable to reduced PRC1 occupancy detected by chromatin immunoprecipitation following 1,6-hexanediol treatment as the addition of 2,5-hexanediol has similar effects on binding despite this alcohol not perturbing PRC1-mediated 3D clustering, at least at the sub-megabase and megabase scales. These results suggest that weak hydrophobic interactions between PRC1 molecules may have a role in polycomb-mediated genome organization.<\/jats:p>","DOI":"10.26508\/lsa.202302101","type":"journal-article","created":{"date-parts":[[2023,7,27]],"date-time":"2023-07-27T13:48:21Z","timestamp":1690465701000},"page":"e202302101","update-policy":"https:\/\/doi.org\/10.26508\/lsa.crossmarkpolicy","source":"Crossref","is-referenced-by-count":14,"title":["Dispersal of PRC1 condensates disrupts polycomb chromatin domains and loops"],"prefix":"10.26508","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9707-146X","authenticated-orcid":true,"given":"Iain","family":"Williamson","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/011jsc803","id-type":"ROR","asserted-by":"publisher"}],"name":"MRC Human Genetics Unit","place":[", Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, 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