Genomic DNA Methylation Analyses Reveal the Distinct Profiles in Castor Bean Seeds with Persistent Endosperms

	Genomic DNA Methylation Analyses Reveal the Distinct Profiles in Castor Bean Seeds with Persistent Endosperms
	Xu, Wei ; Yang, Tianquan ; Dong, Xue ; Li, De-Zhu ; Liu, Aizhong
刊名	PLANT PHYSIOLOGY
	2016
卷号	171 期号:2 页码:1242-1258
ISSN号	0032-0889
中文摘要	Investigations of genomic DNA methylation in seeds have been restricted to a few model plants. The endosperm genomic DNA hypomethylation has been identified in angiosperm, but it is difficult to dissect the mechanism of how this hypomethylation is established and maintained because endosperm is ephemeral and disappears with seed development in most dicots. Castor bean (Ricinus communis), unlike Arabidopsis (Arabidopsis thaliana), endosperm is persistent throughout seed development, providing an excellent model in which to dissect the mechanism of endosperm genomic hypomethylation in dicots. We characterized the DNA methylation-related genes encoding DNA methyltransferases and demethylases and analyzed their expression profiles in different tissues. We examined genomic methylation including CG, CHG, and CHH contexts in endosperm and embryo tissues using bisulfite sequencing and revealed that the CHH methylation extent in endosperm and embryo was, unexpectedly, substantially higher than in previously studied plants, irrespective of the CHH percentage in their genomes. In particular, we found that the endosperm exhibited a global reduction in CG and CHG methylation extents relative to the embryo, markedly switching global gene expression. However, CHH methylation occurring in endosperm did not exhibit a significant reduction. Combining with the expression of 24-nucleotide small interfering RNAs (siRNAs) mapped within transposable element (TE) regions and genes involved in the RNA-directed DNA methylation pathway, we demonstrate that the 24-nucleotide siRNAs played a critical role in maintaining CHH methylation and repressing the activation of TEs in persistent endosperm development. This study discovered a novel genomic DNA methylation pattern and proposes the potential mechanism occurring in dicot seeds with persistent endosperm.
学科主题	Plant Sciences
原文出处	10.1104/pp.16.00056
语种	英语
公开日期	2017-06-06
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10449]
专题	西双版纳热带植物园_其他
推荐引用方式 GB/T 7714	Xu, Wei,Yang, Tianquan,Dong, Xue,et al. Genomic DNA Methylation Analyses Reveal the Distinct Profiles in Castor Bean Seeds with Persistent Endosperms[J]. PLANT PHYSIOLOGY,2016,171(2):1242-1258.
APA	Xu, Wei,Yang, Tianquan,Dong, Xue,Li, De-Zhu,&Liu, Aizhong.(2016).Genomic DNA Methylation Analyses Reveal the Distinct Profiles in Castor Bean Seeds with Persistent Endosperms.PLANT PHYSIOLOGY,171(2),1242-1258.
MLA	Xu, Wei,et al."Genomic DNA Methylation Analyses Reveal the Distinct Profiles in Castor Bean Seeds with Persistent Endosperms".PLANT PHYSIOLOGY 171.2(2016):1242-1258.