H2A.Z contributes to trithorax activity at the AGAMOUS locus
H2A.Z contributes to trithorax activity at the AGAMOUS locus
复制标题
H2A.Z 有助于 AGAMOUS 基因座的三胸活动
DOI:
10.1016/j.molp.2022.01.005
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发表时间:
2022
期刊:
影响因子:
27.5
通讯作者:
Wagner, Doris
中科院分区:
文献类型:
--
作者:
Lee, Un-Sa;Bieluszewski, Tomasz;Xiao, Jun;Yamaguchi, Ayako;Wagner, Doris
In multicellular eukaryotes, Polycomb repression heritably silences 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).In Arabidopsis, floral homeotic genes are repressed by Polycomb Repressive Complex 2 (PRC2) in vegetative tissues (Goodrich et al., 1997) and several different TrxG proteins contribute to reversal of PRC2-mediated silencing of floral homeotic genes during flower development (Wu et al., 2012; Liang et al., 2015). Among these, double mutants in the SWI/SNF chromatin remodeling ATPases BRAHMA (BRM) and SPLAYED (SYD) fail to pattern floral organs (Wu et al., 2012). BRM and SYD are recruited to the floral homeotic AGAMOUS (AG) locus by the plant-specific pioneer transcription factor LEAFY (LFY), which promotes floral fate and directs flower patterning (Wu et al., 2012; Jin et al., 2021; Lai et al., 2021). Indeed, mutations in several TrxG proteins enhance floral homeotic defects of the weak lfy-5 mutant (Wu et al., 2012; Liang et al., 2015).