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Mitotic gene conversion can be as important as meiotic conversion in driving genetic variability in plants and other species without early germline segregation

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文献类型：外文期刊

作者： Jia, Xianqing ¹ ; Zhang, Qijun ³ ; Jiang, Mengmeng ² ; Huang, Ju ¹ ; Yu, Luyao ² ; Traw, Milton Brian ¹ ; Tian, Dachen ¹ ;

作者机构： 1.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing, Peoples R China

2.Nanjing Univ, Sch Life Sci, State Key Lab Pharmaceut Biotechnol, Nanjing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing, Peoples R China

4.Univ Bath, Dept Biol & Biochem, Milner Ctr Evolut, Bath, Avon, England

期刊名称：PLOS BIOLOGY （影响因子：7.076；五年影响因子：8.878 ）

ISSN： 1544-9173

年卷期： 2021 年 19 卷 3 期

页码：

收录情况： SCI

摘要： In contrast to common meiotic gene conversion, mitotic gene conversion, because it is so rare, is often ignored as a process influencing allelic diversity. We show that if there is a large enough number of premeiotic cell divisions, as seen in many organisms without early germline sequestration, such as plants, this is an unsafe position. From examination of 1.1 million rice plants, we determined that the rate of mitotic gene conversion events, per mitosis, is 2 orders of magnitude lower than the meiotic rate. However, owing to the large number of mitoses between zygote and gamete and because of long mitotic tract lengths, meiotic and mitotic gene conversion can be of approximately equivalent importance in terms of numbers of markers converted from zygote to gamete. This holds even if we assume a low number of premeiotic cell divisions (approximately 40) as witnessed in Arabidopsis. A low mitotic rate associated with long tracts is also seen in yeast, suggesting generality of results. For species with many mitoses between each meiotic event, mitotic gene conversion should not be overlooked.

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