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Laser Irradiation-Induced DNA Methylation Changes Are Heritable and Accompanied with Transpositional Activation of mPing in Rice

文献类型： 外文期刊

作者： Li, Siyuan 1 ; Xia, Qiong 1 ; Wang, Fang 3 ; Yu, Xiaoming 1 ; Ma, Jian 4 ; Kou, Hongping 4 ; Lin, Xiuyun 5 ; Gao, Xiang 1 ;

作者机构： 1.Northeast Normal Univ, Key Lab Mol Epigenet MOE, Changchun, Peoples R China

2.Jilin Agr Univ, Sch Life Sci, Changchun, Peoples R China

3.Quanzhou Normal Univ, Coll Oceanol & Food Sci, Quanzhou, Peoples R China

4.Jilin Agr Univ, Coll Agron, Changchun, Peoples R China

5.Jilin Acad Agr Sci, Changchun, Peoples R China

关键词： Nd(3+)YAG laser irradiation;DNA methylation;transposable elements;epigenetic inheritance;rice

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2017 年 8 卷

页码：

收录情况： SCI

摘要： DNA methylation is an integral component of the epigenetic code in most higher eukaryotes. Exploring the extent to which DNA methylation can be altered under a specific condition and its heritability is important for elucidating the biological functions of this epigenetic modification. Here, we conducted MSAP analysis of rice plants with altered phenotypes subsequent to a low-dose Nd(3+)YAG laser irradiation. We found that all four methylation patterns at the 5'-CCGG sites that are analyzable by MSAP showed substantial changes in the immediately treated MO plants. Interestingly, the frequencies of hypo- and hypermethylation were of similar extents, which largely offset each other and render the total methylation levels unchanged. Further analysis revealed that the altered methylation patterns were meiotically heritable to at least the M2 generation but accompanied with further changes in each generation. The methylation changes and their heritability of the metastable epigenetic state were verified by bisulfite sequencing of portion of the retrotranspon, Tosl 7, an established locus for assessing DNA methylation liability in rice. Real-time PCR assay indicated that the expression of various methylation-related chromatin genes was perturbed, and a Pearson correlation analysis showed that many of these genes, especially two AGOs (AG04-1 and AGO4-2), were significantly correlated with the methylation pattern alterations. In addition, excisions of a MITE transposon, mPing, occurred rampantly in the laser irradiated plants and their progenies. Together, our results indicate that heritable DNA methylation changes can be readily induced by low-dose laser irradiation, and which can be accompanied by transpostional activation of transposable elements.

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