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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
2016
Source PublicationPLANT PHYSIOLOGY
ISSN0032-0889
Volume171Issue:2Pages:1242-1258
AbstractInvestigations 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.
Subject AreaPlant Sciences
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10449
Collection其他
Recommended Citation
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.
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