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A selfish genetic element encoded by qHMS7 confers non-Mendelian inheritance in rice

Xiaowen Yu  Zhigang Zhao  Xiaoming Zheng  Jiawu Zhou  Weiyi Kong  Peiran Wang  Wenting Bai  Hai Zheng  Huan Zhang  Jing Li  Jiafan Liu  Qiming Wang  Long Zhang  Kai Liu  Yang Yu  Xiuping Guo  Jiulin Wang  Qibing Lin  Fuqing Wu  Yulong Ren  Shanshan Zhu  Xin Zhang  Zhijun Cheng  Cailin Lei  Shijia Liu  Xi Liu  Yunlu Tian  Ling Jiang  Song Ge  Chuanyin Wu  Dayun Tao  Haiyang Wang  Jianmin Wan  
【摘要】:Selfish genetic elements are pervasive in eukaryote genomes but their role remains controversial. We show that qHMS7, a major quantitative genetic locus for hybrid male sterility between wild rice(Oryza meridionalis) and Asian cultivated rice(O. sativa), contains two tightly linked genes [Open Reading Frame 2(ORF2) and ORF3]. ORF2 encodes a toxic genetic element that aborts pollen in a sporophytic manner, whereas ORF3 encodes an antidote that protects pollen in a gametophytic manner. Pollens lacking ORF3 are selectively eliminated, leading to segregation distortion in the progeny. Analysis of the genetic sequence suggests that ORF3 arose first, followed by gradual functionalization of ORF2. Furthermore, this toxinantidote system may have promoted the differentiation and/or maintained the genome stability of wild and cultivated rice.

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