中国农业科学院蔬菜花卉研究所2018年度公开招聘工作人员推迟报名截止时间的公告 中国农业科学院蔬菜花卉所2018年度公开招聘工作人员公告

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

来源: 发布时间:07-06 作者: 点击量:
Feng Cheng1, Jian Wu1, Lu Fang1, Silong Sun1, Bo Liu1, Ke Lin2, Guusje Bonnema2, Xiaowu Wang1

PLoS One, 7(5): e36442 (2012)
DOI: 10.1371/journal.pone.0036442

Abstract: 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.
分享到: