Transgenerational epigenetic instability is a source of novel methylation variants.

Transgenerational epigenetic instability is a source of novel methylation variants.
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DOI:
10.1126/science.1212959
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发表时间:
2011-10-21
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ecker JR
Ecker JR
中科院分区:
其他
文献类型:
--
作者:
Schmitz RJ;Schultz MD;Lewsey MG;O'Malley RC;Urich MA;Libiger O;Schork NJ;Ecker JR

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表观遗传信息可以胞嘧啶DNA甲基化的形式储存和稳定遗传,这可能会影响生物体的表型。DNA甲基化的变化可以产生影响转录和形态的减数分裂稳定的表观等位基因,但DNA甲基化的自发获得或丧失的速率是未知的。我们研究了自发发生的变化,在拟南芥植物的DNA甲基化繁殖的单种子下降了30代。鉴定了114,287个CG单一甲基化多态性(SMPs)和2485个CG差异甲基化区域(DMR),与祖先状态相比,这两者都显示出分歧模式。因此,DNA甲基化的跨代表观遗传变异可能产生新的等位基因状态,其改变转录,从而在不存在遗传突变的情况下提供表型多样性的机制。
Epigenetic information, which may affect an organisms’ phenotype, can be stored and stably inherited in the form of cytosine DNA methylation. Changes in DNA methylation can produce meiotically stable epialleles that affect transcription and morphology, but the rates of spontaneous gain or loss of DNA methylation are unknown. We examined spontaneously occurring variation in DNA methylation in Arabidopsis thaliana plants propagated by single-seed descent for 30 generations. 114,287 CG single methylation polymorphisms (SMPs) and 2485 CG differentially methylated regions (DMRs) were identified, both of which show patterns of divergence compared to the ancestral state. Thus, transgenerational epigenetic variation in DNA methylation may generate new allelic states that alter transcription providing a mechanism for phenotypic diversity in the absence of genetic mutation.
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