Biased Gene Fractionation and Dominant Gene Expression among the Subgenomes of Brassica rapa

文献类型： 外文期刊

第一作者： Cheng, Feng

作者： Cheng, Feng;Wu, Jian;Fang, Lu;Sun, Silong;Liu, Bo;Wang, Xiaowu;Lin, Ke;Bonnema, Guusje

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2012 年 7 卷 5 期

页码：

收录情况： SCI

摘要： Polyploidization, both ancient and recent, is frequent among plants. A "two-step theory'' was proposed to explain the meso-triplication of the Brassica "A'' genome: Brassica rapa. By accurately partitioning of this genome, we observed that genes in the less fractioned subgenome (LF) were dominantly expressed over the genes in more fractioned subgenomes (MFs: MF1 and MF2), while the genes in MF1 were slightly dominantly expressed over the genes in MF2. The results indicated that the dominantly expressed genes tended to be resistant against gene fractionation. By re-sequencing two B. rapa accessions: a vegetable turnip (VT117) and a Rapid Cycling line (L144), we found that genes in LF had less non-synonymous or frameshift mutations than genes in MFs; however mutation rates were not significantly different between MF1 and MF2. The differences in gene expression patterns and on-going gene death among the three subgenomes suggest that "two-step'' genome triplication and differential subgenome methylation played important roles in the genome evolution of B. rapa.

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