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2018年1月31日nature communications在线发表了题为“A naturally occurring epiallele associates with leaf senescence and local climate adaptation in Arabidopsis accessions”的文章。
本文由中国科学院上海植物逆境生物学研究中心朱健康课题组完成。文章发现了一个新的表观遗传等位基因,其甲基化状态可以稳定遗传,并与叶片衰老和局部气候适应性相关。
摘要:
表观遗传变异可以促进对变化环境的适应,但是缺乏天然的表观遗传等位基因对适应性进化贡献的证据。在这里,我们鉴定了一个名为“NMR19”(天然存在的DNA甲基化变异区域19)的反转录转座子,其在拟南芥不同种质的甲基化和基因组的位置不同。根据NMR19-4和NMR19-16的位置,我们将它们归类为NMR19,并发现NMR19-4是一个表观遗传的等位基因,可以通过调节PPH的表达来调控叶片衰老。我们发现NMR19-4的DNA甲基化状态是稳定遗传的,与遗传变异无关。另外,进一步分析表明,NMR19-4的DNA甲基化与局部气候相关,这意味着NMR19-4是与环境相关的表观遗传等位基因。总结起来,我们发现了一个新的表观遗传等位基因,并为其在适应局部气候方面的起源和潜在功能提供了机制性的见解。
Abstract:
Epigenetic variation has been proposed to facilitate adaptation to changing environments, but evidence that natural epialleles contribute to adaptive evolution has been lacking. Here we identify a retrotransposon, named “NMR19” (naturally occurring DNA methylation variation region 19), whose methylation and genomic location vary among Arabidopsis thaliana accessions. We classify NMR19 as NMR19-4 and NMR19-16 based on its location, and uncover NMR19-4 as an epiallele that controls leaf senescence by regulating the expression of PHEOPHYTIN PHEOPHORBIDE HYDROLASE (PPH). We find that the DNA methylation status of NMR19-4 is stably inherited and independent of genetic variation. In addition, further analysis indicates that DNA methylation of NMR19-4 correlates with local climates, implying that NMR19-4 is an environmentally associated epiallele. In summary, we discover a novel epiallele, and provide mechanistic insights into its origin and potential function in local climate adaptation.
Fig. 6 NMR19-4m controls leaf senescence
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