Horizontal gene transfer in plants
Horizontal gene transfer in plants
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DOI：
10.1093/jxb/erl148
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发表时间：
2007-01-01
影响因子：
6.9
通讯作者：
Palmer, Jeffrey D.
中科院分区：
文献类型：
--
作者：
Richardson, Aaron O.;Palmer, Jeffrey D.
水平基因转移（HGT）在细菌进化中起着重要作用，在某些单细胞真核生物中相当普遍。然而，HGT在多细胞真核生物进化中的普遍性和重要性尚不清楚。最近的研究表明，相对于其他多细胞真核生物的细胞器和核基因组，植物线粒体基因组在HGT中异常活跃。尽管对植物HGT的机制知之甚少，但一些研究表明，寄生植物既是线粒体基因的供体，也是受体。迄今为止发现的大多数案例涉及每个物种的单个转移基因；然而，最近的研究发现了一个大规模HGT的案例，涉及至少几十个，甚至可能数百个外来线粒体基因的获取。这些外来基因来自多个供体，主要是菊苣和苔藓。本文将对这种大规模转移的意义、植物间线粒体HGT的潜在机制和后果以及植物叶绿体和核基因组中HGT的有限证据进行综述。
Horizontal gene transfer (HGT) has played a major role in bacterial evolution and is fairly common in certain unicellular eukaryotes. However, the prevalence and importance of HGT in the evolution of multicellular eukaryotes remain unclear. Recent studies indicate that plant mitochondrial genomes are unusually active in HGT relative to all other organellar and nuclear genomes of multicellular eukaryotes. Although little about the mechanisms of plant HGT is known, several studies have implicated parasitic plants as both donors and recipients of mitochondrial genes. Most cases uncovered thus far have involved a single transferred gene per species; however, recent work has uncovered a case of massive HGT in Amborella trichopoda involving acquisition of at least a few dozen and probably hundreds of foreign mitochondrial genes. These foreign genes came from multiple donors, primarily eudicots and mosses. This review will examine the implications of such massive transfer, the potential mechanisms and consequences of plant-to-plant mitochondrial HGT in general, as well as the limited evidence for HGT in plant chloroplast and nuclear genomes.