Locus-specific control of the de novo DNA methylation pathway in Arabidopsis by the CLASSY family

被引:102
|
作者
Zhou, Ming [1 ]
Palanca, Ana Marie S. [1 ]
Law, Julie A. [1 ]
机构
[1] Salk Inst Biol Studies, Plant Mol & Cellular Biol Lab, 10010 N Torrey Pines Rd, La Jolla, CA 92037 USA
关键词
RNA-POLYMERASE-IV; EPIGENETIC INHERITANCE; POL IV; TRANSCRIPTION; ROLES; DEMETHYLATION; ULTRAFAST; COMPONENT; MACHINERY; EPIGENOME;
D O I
10.1038/s41588-018-0115-y
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
DNA methylation is essential for gene regulation, transposon silencing and imprinting. Although the generation of specific DNA methylation patterns is critical for these processes, how methylation is regulated at individual loci remains unclear. Here we show that a family of four putative chromatin remodeling factors, CLASSY (CLSY) 1-4, are required for both locus-specific and global regulation of DNA methylation in Arabidopsis thaliana. Mechanistically, these factors act in connection with RNA polymerase-IV (Pol-IV) to control the production of 24-nucleotide small interfering RNAs (24nt-siRNAs), which guide DNA methylation. Individually, the CLSYs regulate Pol-IV-chromatin association and 24nt-siRNA production at thousands of distinct loci, and together, they regulate essentially all 24nt-siRNAs. Depending on the CLSYs involved, this regulation relies on different repressive chromatin modifications to facilitate locus-specific control of DNA methylation. Given the conservation between methylation systems in plants and mammals, analogous pathways may operate in a broad range of organisms.
引用
收藏
页码:865 / +
页数:15
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