数字农科院2.0

The lack of negative association between TE load and subgenome dominance in synthesized Brassica allotetraploids

文献类型： 外文期刊

作者： Kang Zhang;Lingkui Zhang;Yinan Cui;Yinqing Yang;Jian Wu;Jianli Liang;Xing Li;Xin Zhang;Yiyue Zhang;Zhongwei Guo;Lei Zhang;Shumin Chen;Jue Ruan;Michael Freeling;Xiaowu Wang;Feng Cheng

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关键词： methylation;polyploidization;subgenome dominance;transposon

期刊名称： Proceedings of the National Academy of Sciences of the United States of America

ISSN： 0027-8424

年卷期： 2023 年 120 卷 42 期

页码：

收录情况： SCIE（2023版）

摘要： Polyploidization is important to the evolution of plants. Subgenome dominance is a distinct phenomenon associated with most allopolyploids. A gene on the dominant subgenome tends to express to higher RNA levels in all organs as compared to the expression of its syntenic paralogue (homoeolog). The mechanism that underlies the formation of subgenome dominance remains unknown, but there is evidence for the involvement of transposon/DNA methylation density differences nearby the genes of parents as being causal. The subgenome with lower density of transposon and methylation near genes is positively associated with subgenome dominance. Here, we generated eight generations of allotetraploid progenies from the merging of parental genomes Brassica rapa and Brassica oleracea. We found that transposon/methylation density differ near genes between the parental (rapa:oleracea) existed in the wide hybrid, persisted in the neotetraploids (the synthetic Brassica napus), but these neotetraploids expressed no expected subgenome dominance. This absence of B. rapa vs. B. oleracea subgenome dominance is particularly significant because, while there is no negative relationship between transposon/methylation level and subgenome dominance in the neotetraploids, the more ancient parental subgenomes for all Brassica did show differences in transposon/ methylation densities near genes and did express, in the same samples of cells, biased gene expression diagnostic of subgenome dominance. We conclude that subgenome differences in methylated transposon near genes are not sufficient to initiate the biased gene expressions defining subgenome dominance. Our result was unexpected, and we suggest a "nuclear chimera" model to explain our data.

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