H2A.Z contributes to trithorax activity at the AGAMOUS locus

Dear Editor, In multicellular eukaryotes,Polycomb repression heritably si-lences gene expression programs not needed or detrimental for a given developmental stage or tissue(Schuettengruber et al.,2017).During cell fate reprogramming,Polycomb silencing can be overcome by the combined activity of multiple Trithorax group(TrxG)proteins(Wu et al.,2012;Liang et al.,2015;Schuettengruber et al.,2017).TrxG proteins are genetically defined as suppressors of homeotic defects caused by loss of Polycomb function and have diverse enzymatic activities(Schuettengruber et al.,2017).We used a genetic enhancer screen to identify candidate TrxG proteins and uncovered TrxG activity for components of the SWR1 chromatin remodeling complex,which deposits the histone variant H2A.Z(Deal et al.,2007;March-Diaz et al.,2008).