Comparative Genomics Analysis of Rice and Pineapple Contributes to Understand the Chromosome Number Reduction and Genomic Changes in Grasses.
Comparative Genomics Analysis of Rice and Pineapple Contributes to Understand the Chromosome Number Reduction and Genomic Changes in Grasses.
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水稻和菠萝的比较基因组学分析有助于了解禾本科植物的染色体数量减少和基因组变化
DOI：
10.3389/fgene.2016.00174
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发表时间：
2016
影响因子：
3.7
通讯作者：
Wang X
中科院分区：
文献类型：
--
作者：
Wang J;Yu J;Sun P;Li Y;Xia R;Liu Y;Ma X;Yu J;Yang N;Lei T;Wang Z;Wang L;Ge W;Song X;Liu X;Sun S;Liu T;Jin D;Pan Y;Wang X
水稻是研究最多的模式植物之一，经过一亿年前的草共同四倍化∼后，具有与草共同祖先最相似的基因组结构。在四倍化之前，是否存在5条或7条基本染色体一直存在争议，这些基本染色体被解决了，但由于缺乏一种测序和组装的外群植物具有保守的基因组结构而无法很好地解决。近年来，菠萝基因组的获得为解决上述争议和研究水稻等禾本科植物的基因组变化提供了宝贵的机会。在这里，我们对菠萝和水稻进行了比较基因组学分析，发现了确凿的证据，即草本植物的共同祖先在四倍化之前有2n=2x=14条基本染色体，四倍化后复制到2n=4x=28。此外，我们提出，水稻重复区域的大量基因缺失应该由显著分化的亲本产生的异源四倍体来解释，而不是它们分化后的基因丢失。这意味着基因组分裂可能发生在异源四倍体牧草祖先形成之前。
Rice is one of the most researched model plant, and has a genome structure most resembling that of the grass common ancestor after a grass common tetraploidization ∼100 million years ago. There has been a standing controversy whether there had been five or seven basic chromosomes, before the tetraploidization, which were tackled but could not be well solved for the lacking of a sequenced and assembled outgroup plant to have a conservative genome structure. Recently, the availability of pineapple genome, which has not been subjected to the grass-common tetraploidization, provides a precious opportunity to solve the above controversy and to research into genome changes of rice and other grasses. Here, we performed a comparative genomics analysis of pineapple and rice, and found solid evidence that grass-common ancestor had 2n = 2x = 14 basic chromosomes before the tetraploidization and duplicated to 2n = 4x = 28 after the event. Moreover, we proposed that enormous gene missing from duplicated regions in rice should be explained by an allotetraploid produced by prominently divergent parental lines, rather than gene losses after their divergence. This means that genome fractionation might have occurred before the formation of the allotetraploid grass ancestor.
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影响因子：
64.8
作者：
Matsumoto, T;Wu, JZ;Sugiura, M
通讯作者：
Sugiura, M
影响因子：
3
作者：
Wang X;Shi X;Li Z;Zhu Q;Kong L;Tang W;Ge S;Luo J
通讯作者：
Luo J
影响因子：
11.8
作者：
Ding, DQ;Yamamoto, A;Hiraoka, Y
通讯作者：
Hiraoka, Y
影响因子：
3.3
作者：
Murat F;Zhang R;Guizard S;Gavranović H;Flores R;Steinbach D;Quesneville H;Tannier E;Salse J
通讯作者：
Salse J
影响因子：
9.2
作者：
Vazquez, J;Belmont, AS;Sedat, JW
通讯作者：
Sedat, JW