@Article{Chelmicki_Dundar_Turley-MOF_compl_ensur-2014, author = {Chelmicki, Tomasz and Dundar, Friederike and Turley, Matthew and Khanam, Tasneem and Aktas, Tugce and Ramirez, Fidel and Gendrel, Anne-Valerie and Wright, Patrick R. and Videm, Pavankumar and Backofen, Rolf and Heard, Edith and Manke, Thomas and Akhtar, Asifa}, title = {{MOF}-associated complexes ensure stem cell identity and {Xist} repression}, journal = {Elife}, year = {2014}, volume = {3}, number = {}, pages = {e02024}, user = {backofen}, pmid = {24842875}, doi = {10.7554/eLife.02024}, issn = {2050-084X}, abstract = {Histone acetyl transferases (HATs) play distinct roles in many cellular processes and are frequently misregulated in cancers. Here, we study the regulatory potential of MYST1-(MOF)-containing MSL and NSL complexes in mouse embryonic stem cells (ESCs) and neuronal progenitors. We find that both complexes influence transcription by targeting promoters as well as TSS-distal enhancers. In contrast to flies, the MSL complex is not exclusively enriched on the X chromosome yet it is crucial for mammalian X chromosome regulation as it specifically regulates Tsix, the major repressor of Xist lncRNA. MSL depletion leads to decreased Tsix expression, reduced REX1 recruitment, and consequently, enhanced accumulation of Xist and variable numbers of inactivated X chromosomes during early differentiation. The NSL complex provides additional, Tsix-independent repression of Xist by maintaining pluripotency. MSL and NSL complexes therefore act synergistically by using distinct pathways to ensure a fail-safe mechanism for the repression of X inactivation in ESCs.} }