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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >From the Cover: Massive horizontal transfer of mitochondrial genes from diverse land plant donors to the basal angiosperm Amborella
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From the Cover: Massive horizontal transfer of mitochondrial genes from diverse land plant donors to the basal angiosperm Amborella

机译：从封面：线粒体基因从不同的陆地植物供体向基础被子植物Amborella的大规模水平转移

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摘要

Several plants are known to have acquired a single mitochondrial gene by horizontal gene transfer (HGT), but whether these or any other plants have acquired many foreign genes is entirely unclear. To address this question, we focused on Amborella trichopoda, because it was already known to possess one horizontally acquired gene and because it was found in preliminary analyses to contain several more. We comprehensively sequenced the mitochondrial protein gene set of Amborella, sequenced a variable number of mitochondrial genes from 28 other diverse land plants, and conducted phylogenetic analyses of these sequences plus those already available, including the five sequenced mitochondrial genomes of angiosperms. Results indicate that Amborella has acquired one or more copies of 20 of its 31 known mitochondrial protein genes from other land plants, for a total of 26 foreign genes, whereas no evidence for HGT was found in the five sequenced genomes. Most of the Amborella transfers are from other angiosperms (especially eudicots), whereas others are from nonangiosperms, including six striking cases of transfer from (at least three different) moss donors. Most of the transferred genes are intact, consistent with functionality and/or recency of transfer. Amborella mtDNA has sustained proportionately more HGT than any other eukaryotic, or perhaps even prokaryotic, genome yet examined.
机译：已知有几种植物通过水平基因转移（HGT）获得了单个线粒体基因，但是这些植物或其他植物是否已经获得了许多外来基因尚不清楚。为了解决这个问题，我们将重点放在三叶草（Amborella trichopoda）上，因为已知它具有一个水平获得的基因，并且在初步分析中发现它还包含另外几个。我们对Amborella的线粒体蛋白质基因组进行了全面测序，对来自其他28种不同陆地植物的可变数量的线粒体基因进行了测序，并对这些序列以及已经存在的序列（包括五个被子植物的线粒体基因组序列）进行了系统发育分析。结果表明，Amborella已从其他陆地植物中获得了其31种已知的线粒体蛋白质基因中的20种的一个或多个拷贝，总共有26个外源基因，而在这5个测序的基因组中均未发现HGT的证据。多数Amborella移栽来自其他被子植物（特别是双子叶植物），而其他则来自非被子植物，包括6个引人注目的案例（至少三个不同）的苔藓供体。大多数转移的基因是完整的，与转移的功能和/或新近度一致。 Amborella mtDNA的HGT比例要比尚未检查的任何其他真核基因组甚至原核基因组高。

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