Active DNA demethylation in plant companion cells reinforces transposon methylation in gametes.

Active DNA demethylation in plant companion cells reinforces transposon methylation in gametes.
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DOI:
10.1126/science.1224839
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发表时间:
2012-09-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Zilberman D
Zilberman D
中科院分区:
其他
文献类型:
--
作者:
Ibarra CA;Feng X;Schoft VK;Hsieh TF;Uzawa R;Rodrigues JA;Zemach A;Chumak N;Machlicova A;Nishimura T;Rojas D;Fischer RL;Tamaru H;Zilberman D

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拟南芥中央细胞是卵子的伴侣细胞,在受精前经历DNA去甲基化,但这一过程的靶向偏好、机制和生物学意义尚不清楚。在这里,我们表明,由DEMETER DNA糖基化酶介导的活性DNA去甲基化占所有的中央细胞中的去甲基化,并优先针对小,AT丰富,核小体耗尽常染色体转座因子。营养细胞,精子的伴侣细胞,也经历类似序列的DEMETER依赖性去甲基化,营养细胞中缺乏DEMETER导致精子中转座子的小RNA指导的DNA甲基化减少。我们的研究结果表明,伴随细胞中的去甲基化增强了植物配子中的转座子甲基化,并可能有助于跨代稳定沉默转座因子。
The Arabidopsis thaliana central cell, the companion cell of the egg, undergoes DNA demethylation before fertilization, but the targeting preferences, mechanism, and biological significance of this process remain unclear. Here, we show that active DNA demethylation mediated by the DEMETER DNA glycosylase accounts for all of the demethylation in the central cell and preferentially targets small, AT-rich, and nucleosome-depleted euchromatic transposable elements. The vegetative cell, the companion cell of sperm, also undergoes DEMETER-dependent demethylation of similar sequences, and lack of DEMETER in vegetative cells causes reduced small RNA–directed DNA methylation of transposons in sperm. Our results demonstrate that demethylation in companion cells reinforces transposon methylation in plant gametes and likely contributes to stable silencing of transposable elements across generations.
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