A structural-maintenance-of-chromosomes hinge domain-containing protein is required for RNA-directed DNA methylation

被引:154
作者
Kanno, Tatsuo [1 ]
Bucher, Etienne [1 ]
Daxinger, Lucia [1 ]
Huettel, Bruno [1 ]
Boehmdorfer, Gudrun [1 ]
Gregor, Wolfgang [2 ]
Kreil, David P. [3 ]
Matzke, Marjori [1 ]
Matzke, Antonius J. M. [1 ]
机构
[1] Austrian Acad Sci, Gregor Mendel Inst Mol Plant Biol, A-1030 Vienna, Austria
[2] Univ Vet Med, Res Grp Mol Pharmacol & Toxicol, Dept Sci, A-1210 Vienna, Austria
[3] Boku Univ, Dept Bioinformat, A-1190 Vienna, Austria
基金
奥地利科学基金会;
关键词
D O I
10.1038/ng.119
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
RNA-directed DNA methylation (RdDM) is a process in which dicer-generated small RNAs guide de novo cytosine methylation at the homologous DNA region(1,2). To identify components of the RdDM machinery important for Arabidopsis thaliana development, we targeted an enhancer active in meristems for methylation, which resulted in silencing of a downstream GFP reporter gene. This silencing system also features secondary siRNAs, which trigger methylation that spreads beyond the targeted enhancer region. A screen for mutants defective in meristem silencing and enhancer methylation retrieved six dms complementation groups, which included the known factors DRD1 (ref. 3; a SNF2-like chromatin-remodeling protein) and Pol IVb subunits(4,5). Additionally, we identified a previously unknown gene DMS3 (At3g49250), encoding a protein similar to the hinge-domain region of structural maintenance of chromosomes (SMC) proteins. This finding implicates a putative chromosome architectural protein that can potentially link nucleic acids(6) in facilitating an RNAi-mediated epigenetic modification involving secondary siRNAs and spreading of DNA methylation.
引用
收藏
页码:670 / 675
页数:6
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