Mutation of a major CG methylase in rice causes genome-wide hypomethylation, dysregulated genome expression, and seedling lethality

文献类型： 外文期刊

第一作者： Hu, Lanjuan

作者： Hu, Lanjuan;Li, Ning;Xu, Chunming;Zhong, Silin;Yang, Jingjing;Zhou, Tianqi;Yuliang, Anzhi;Wu, Ying;Liu, Bao;Zhong, Silin;Chen, Yun-Ru;Lin, Xiuyun;Cao, Xiaofeng;Cao, Xiaofeng;Zemach, Assaf;Rustgi, Sachin;von Wettstein, Diter;Rustgi, Sachin;von Wettstein, Diter;Rustgi, Sachin;von Wettstein, Diter

作者机构：

关键词： Oryza sativa L.;monocotyledons

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.205； 五年影响因子：12.291 ）

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收录情况： SCI

摘要： Cytosine methylation at CG sites (~mCG) plays critical roles in development, epigenetic inheritance, and genome stability in mammals and plants. In the dicot model plant Arabidopsis thaliana, methyltransferase 1 (MET1), a principal CG methylase, functions to maintain ~mCG during DNA replication, with its null mutation resulting in global hypomethylation and pleiotropic developmental defects. Null mutation of a critical CG methylase has not been characterized at a whole-genome level in other higher eukaryotes, leaving the generality of the Arabidopsis findings largely speculative. Rice is a model plant of monocots, to which many of our important crops belong. Here we have characterized a null mutant of OsMet1-2, the major CG methylase in rice. We found that seeds homozygous for OsMet1-2 gene mutation (OsMET1-2~(?/?)), which directly segregated from normal heterozygote plants (OsMET1-2~(+/?)), were seriously maldeveloped, and all germinated seedlings underwent swift necrotic death. Compared with wild type, genome-wide loss of ~mCG occurred in the mutant methylome, which was accompanied by a plethora of quantitativemolecular phenotypes including dysregulated expression of diverse protein-coding genes, activation and repression of transposable elements, and altered small RNA profiles. Our results have revealed conservation but also distinct functional differences in CG methylases between rice and Arabidopsis.

分类号： N

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