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首页> 外文期刊>Journal of bacteriology >Origins of Flagellar Gene Operons and Secondary Flagellar Systems
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Origins of Flagellar Gene Operons and Secondary Flagellar Systems

机译：鞭毛基因操纵子和次级鞭毛系统的起源

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Forty-one flagellated species representing 11 bacterial phyla were used to investigate the origin of secondary flagellar systems and the structure and formation of flagellar gene operons over the course of bacterial evolution. Secondary (i.e., lateral) flagellar systems, which are harbored by five of the proteobacterial species considered, originated twice, once in the alphaproteobacterial lineage and again in the common ancestor of the Beta- and Gammaproteobacteria. The order and organization of flagellar genes have undergone extensive shuffling and rearrangement among lineages, and based on the phylogenetic distributions of flagellar gene complexes, the flagellar gene operons existed as small, usually two-gene units in the ancestor of Bacteria and have expanded through the recruitment of new genes and fusion of gene units. In contrast to the evolutionary trend towards larger flagellar gene complexes, operon structures have been highly disrupted through gene disassociation and rearrangements in the Epsilon- and Alphaproteobacteria. These results demonstrate that the genetic basis of this ancient and structurally conserved organelle has been subject to many lineage-specific modifications.
机译：代表11个细菌门的41个鞭毛物种被用来调查次级鞭毛系统的起源以及鞭毛基因操纵子在细菌进化过程中的结构和形成。二级（即侧生）鞭毛系统由所考虑的5种变形细菌物种所掩藏，起源于两次，一次起源于α变形细菌谱系，又一次起源于 Beta -和 Gamma变形细菌的祖先。 。鞭毛基因的顺序和组织在谱系之间​​经历了广泛的改组和重排，并且根据鞭毛基因复合体的系统发育分布，鞭毛基因操纵子在细菌的祖先中以小的，通常为两个基因的单元存在。并通过招募新基因和融合基因单位进行了扩展。与更大鞭毛基因复合体的进化趋势相反，操纵子的结构由于 Epsilon -和 Alphaproteobacteria 中的基因解离和重排而受到高度破坏。这些结果表明，这种古老且结构保守的细胞器的遗传基础已经受到许多沿袭特异性的修饰。

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