DNA methylome analysis provides evidence that the expansion of the tea genome is linked to TE bursts

文献类型： 外文期刊

第一作者： Wang, Lei

作者： Wang, Lei;Jing, Shengli;Yuan, Hongyu;Shi, Yan;Wang, Haifeng;Chang, Xiaojun;Zhang, Qunjie;You, Chenjiang;You, Chenjiang

作者机构：

关键词： DNA methylation; tea methylome; genome expansion; TE burst

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2019 年 17 卷 4 期

页码：

收录情况： SCI

摘要： DNA methylation is essential for gene regulation, imprinting and silencing of transposable elements (TEs). Although bursts of transposable elements are common in many plant lineages, how plant DNA methylation is related to transposon bursts remains unclear. Here we explore the landscape of DNA methylation of tea, a species thought to have experienced a recent transposon burst event. This species possesses more transposable elements than any other sequenced asterids (potato, tomato, coffee, pepper and tobacco). The overall average DNA methylation levels were found to differ among the tea, potato and tomato genomes, and methylation at CHG sequence sites was found to be significantly higher in tea than that in potato or tomato. Moreover, the abundant TEs resulting from burst events not only resulted in tea developing a very large genome size, but also affected many genes involved in importantly biological processes, including caffeine, theanine and flavonoid metabolic pathway genes. In addition, recently transposed TEs were more heavily methylated than ancient ones, implying that DNA methylation is proportionate to the degree of TE silencing, especially on recent active ones. Taken together, our results show that DNA methylation regulates transposon silencing and may play a role in genome size expansion.

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