Arabidopsis Serrate Coordinates Histone Methyltransferases ATXR5/6 and RNA Processing Factor RDR6 to Regulate Transposon Expression (Developmental Cell)

Serrate is a key factor in RNA metabolism. Here, Ma et al. uncover its new roles in regulating TE expression: SE promotes ATXR5/6-mediated H3K27me1 mark to repress TE transcription while protecting TE transcripts from the RDR6 silencing activity. Thus, Serrate coordinates the TGS and PTGS machineries to fine-tune TE expression.