Angiosperm genome comparisons reveal early polyploidy in the monocot lineage
Angiosperm genome comparisons reveal early polyploidy in the monocot lineage
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DOI：
10.1073/pnas.0908007107
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发表时间：
2010-01-05
影响因子：
11.1
通讯作者：
Paterson, Andrew H.
中科院分区：
文献类型：
--
作者：
Tang, Haibao;Bowers, John E.;Paterson, Andrew H.
尽管在大多数现代谷物的共同谱系中发生全基因组复制的时间和程度是清楚的，但谷物和其他单子叶植物中更古老的基因组复制的存在或程度已经被暗示，但仍然不清楚。我们提供了比Pancereal Rho(Rho)复制更深层次的额外复制块的证据，覆盖了至少20%的谷物转录组。这些更古老的重复区域，在这里被称为sigma，在水稻和高粱的基因组内和基因组间分析中都很明显。这种古老的重复事件的解决提高了对单子叶动物早期进化史和基因家族的起源和扩展的理解。同线区块的比较表明，在单子叶植物(水稻)和真双子叶植物(葡萄)的假定同源区域中，结构上存在明显的相似性。尽管由于分子时钟假设的不确定性，Sigma-复制(S)的确切时间尚不清楚，但我们的数据表明，它发生在单子叶系统的早期，在它与真叶支系的分歧之后。
Although the timing and extent of a whole-genome duplication occurring in the common lineage of most modern cereals are clear, the existence or extent of more ancient genome duplications in cereals and perhaps other monocots has been hinted at, but remain unclear. We present evidence of additional duplication blocks of deeper hierarchy than the pancereal rho (rho) duplication, covering at least 20% of the cereal transcriptome. These more ancient duplicated regions, herein called sigma, are evident in both intragenomic and intergenomic analyses of rice and sorghum. Resolution of such ancient duplication events improves the understanding of the early evolutionary history of monocots and the origins and expansions of gene families. Comparisons of syntenic blocks reveal clear structural similarities in putatively homologous regions of monocots (rice) and eudicots (grapevine). Although the exact timing of the sigma-duplication(s) is unclear because of uncertainties of the molecular clock assumption, our data suggest that it occurred early in the monocot lineage after its divergence from the eudicot clade.