The role of Mediator in small and long noncoding RNA production in Arabidopsis thaliana.
Mediator is a conserved multi-subunit complex known to promote the transcription of protein-coding genes by RNA polymerase II (Pol II) in eukaryotes. It has been increasingly realized that Pol II transcribes a large number of intergenic loci to generate noncoding RNAs, but the role of Mediator in Pol II-mediated noncoding RNA production has been largely unexplored. The role of Mediator in noncoding RNA production in plants is particularly intriguing given that plants have evolved from Pol II two additional polymerases, Pol IV and Pol V, to specialize in noncoding RNA production and transcriptional gene silencing at heterochromatic loci. Here, we show that Mediator is required for microRNA (miRNA) biogenesis by recruiting Pol II to promoters of miRNA genes. We also show that several well-characterized heterochromatic loci are de-repressed in Mediator mutants and that Mediator promotes Pol II-mediated production of long noncoding scaffold RNAs, which serve to recruit Pol V to these loci. This study expands the function of Mediator to include Pol II-mediated intergenic transcription and implicates a role of Mediator in genome stability.
Department of Botany and Plant Sciences, Institute of Integrative Genome Biology, University of California, Riverside, CA, USA.
Yun Ju
YJ
Kim
Binglian
B
Zheng
Yu
Y
Yu
So Youn
SY
Won
Beixin
B
Mo
Xuemei
X
Chen
D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D015415:Biomarkers / Q000378:metabolism; D015152:Blotting, Northern; D047369:Chromatin Immunoprecipitation; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D020868:Gene Silencing; D056892:Mediator Complex / Q000235:genetics / Q000378:metabolism*; D009154:Mutation / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D012319:RNA Polymerase II / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics; D022661:RNA, Untranslated / Q000235:genetics* / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic
D029681:Arabidopsis Proteins; D015415:Biomarkers; D056892:Mediator Complex; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D022661:RNA, Untranslated; D012319:RNA Polymerase II
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