Evidence that rice and other cereals are ancient aneuploids
Evidence that rice and other cereals are ancient aneuploids
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DOI：
10.1105/tpc.014019
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发表时间：
2003-09-01
期刊：
影响因子：
11.6
通讯作者：
Van de Peer, Y
中科院分区：
文献类型：
--
作者：
Vandepoele, K;Simillion, C;Van de Peer, Y
对几种模式生物基因组的详细分析表明，大规模的基因复制甚至全基因组复制在许多真核生物的进化史上发挥了突出的作用。最近，有强有力的证据表明，双子叶模式植物拟南芥的基因组结构是多轮全基因组复制的结果。在这里，我们分析了单子叶模式植物水稻的基因组，最近公布了水稻的基因组序列草案。我们发现很大一部分水稻基因(类似于15%)存在于重复片段中。对这些块重复的测年，它们在不同水稻染色体上的不均匀分布，以及与拟南芥复制历史的比较表明，水稻并不像以前所说的那样是一个古老的多倍体，而是一个古老的非整倍体，在其进化的过去经历了一条或一条染色体的很大一部分的复制，类似于7000万年前。这一日期早于大多数谷物的分化，系统发育分析的相对测年表明，即使不是全部，也是大多数谷物都有这种重复事件。
Detailed analyses of the genomes of several model organisms revealed that large-scale gene or even entire-genome duplications have played prominent roles in the evolutionary history of many eukaryotes. Recently, strong evidence has been presented that the genomic structure of the dicotyledonous model plant species Arabidopsis is the result of multiple rounds of entire-genome duplications. Here, we analyze the genome of the monocotyledonous model plant species rice, for which a draft of the genomic sequence was published recently. We show that a substantial fraction of all rice genes (similar to15%) are found in duplicated segments. Dating of these block duplications, their nonuniform distribution over the different rice chromosomes, and comparison with the duplication history of Arabidopsis suggest that rice is not an ancient polyploid, as suggested previously, but an ancient aneuploid that has experienced the duplication of one-or a large part of one-chromosome in its evolutionary past, similar to70 million years ago. This date predates the divergence of most of the cereals, and relative dating by phylogenetic analysis shows that this duplication event is shared by most if not all of them.