For absent friends: life without recombination in mutualistic gamma-proteobacteria.

For absent friends: life without recombination in mutualistic gamma-proteobacteria.
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对于缺席的朋友:在互利的伽马变形菌中没有重组的生活。

DOI:
10.1016/j.tim.2009.03.005
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发表时间:
2009
影响因子:
15.9
通讯作者:
Sharples GJ
Sharples GJ
中科院分区:
生物学1区
文献类型:
--
作者:
Sharples GJ

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几乎所有的细胞生物体都使用RecA直系同源物来指导DNA重组和修复所必需的链侵入反应。这一正统理论的少数例外之一是一群γ-变形菌,它们在与昆虫和深海蛤的专性细胞内共生中蓬勃发展。这些细菌明显不能开始重组交换过程似乎通过防止任何进一步的重排或横向转移事件来赋予遗传稳定性。虽然争论集中在缺乏选定的重组功能及其对固定的基因组结构的影响,但没有解释细菌如何在失去这样一个完整的DNA修复系统后存活下来。这个问题是解决在这里推测如何在共生细菌中的重组酶的现有库可以使潜在的致命损伤的DNA模板的恢复。根据保留哪些功能,有几种不同的选择是合理的。特定的缺陷重组鼓励激进的基因组侵蚀互利共生的内共生菌和其他细胞内细菌的可能性进行了讨论。
Almost all cellular organisms employ RecA orthologues to guide the strand invasion reactions necessary for DNA recombination and repair. One of the few exceptions to this orthodoxy is a group of γ-proteobacteria flourishing in obligate intracellular symbiosis with insects and deep-sea clams. The apparent inability of these bacteria to commence the recombinational exchange process seems to confer genetic stability by preventing any further rearrangements or lateral transfer events. Although debate has centred on the absence of selected recombination functions and their impact on a fixed genomic architecture, no explanation has been offered for how bacteria survive the loss of such an integral DNA repair system. This question is addressed here by speculating on how the current repertoire of recombinases in symbiotic bacteria could enable recovery from potentially lethal injuries to the DNA template. Depending on which functions remain, several different options are plausible. The possibility that specific defects in recombination encourage radical genome erosion in mutualistic endosymbionts and other intracellular bacteria is discussed.
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