Cuadrado, AnaGiménez-Llorente, DanielKojic, AleksandarRodríguez-Corsino, MiriamCuartero, YasminaMartín-Serrano, GuillermoGómez López, GonzaloMarti-Renom, Marc A.Losada, Ana2019-09-192019-09-192019Cuadrado A, Giménez-Llorente D, Kojic A, Rodríguez-Corsino M, Cuartero Y, Martín-Serrano G et al. Specific contributions of cohesin-SA1 and cohesin-SA2 to TADs and polycomb domains in embryonic stem cells. Cell Rep. 2019;27(12):3500-10. DOI: 10.1016/j.celrep.2019.05.0782211-1247http://hdl.handle.net/10230/42291Cohesin exists in two variants carrying either STAG/SA1 or SA2. Here we have addressed their specific contributions to the unique spatial organization of the mouse embryonic stem cell genome, which ensures super-enhancer-dependent transcription of pluripotency factors and repression of lineage-specification genes within Polycomb domains. We find that cohesin-SA2 facilitates Polycomb domain compaction through Polycomb repressing complex 1 (PRC1) recruitment and promotes the establishment of long-range interaction networks between distant Polycomb-bound promoters that are important for gene repression. Cohesin-SA1, in contrast, disrupts these networks, while preserving topologically associating domain (TAD) borders. The diverse effects of both complexes on genome topology may reflect two modes of action of cohesin. One, likely involving loop extrusion, establishes overall genome arrangement in TADs together with CTCF and prevents excessive segregation of same-class compartment regions. The other is required for organization of local transcriptional hubs such as Polycomb domains and super-enhancers, which define cell identity.application/pdfeng© 2019 Ana Cuadrado et al. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)info:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.celrep.2019.05.078CohesinSTAG1STAG2PRC1Hox networkPluripotencyChromatin loopCTCFCompartmentHi-Cinfo:eu-repo/semantics/openAccess