Effects of recA mutations on pilus antigenic variation and phase transitions in Neisseria gonorrhoeae.

Effects of recA mutations on pilus antigenic variation and phase transitions in Neisseria gonorrhoeae.
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recA 突变对淋病奈瑟菌菌毛抗原变异和相变的影响。

DOI:
10.1093/genetics/117.3.391
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发表时间:
1987
期刊:
影响因子:
3.3
通讯作者:
Swanson,J
Swanson,J
中科院分区:
生物学2区
文献类型:
--
作者:
Koomey,M;Gotschlich,EC;Robbins,K;Bergström,S;Swanson,J

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单个完整的菌毛蛋白基因(表达位点)和多个不同的部分菌毛蛋白基因拷贝(沉默的储存位点)之间的基因内重组被认为是淋病奈瑟菌菌毛抗原多样性和纤毛期(开-关)变化的原因。与这些形式的菌毛变异相关的基因组重排的机制进行了研究,通过研究淋球菌的同基因菌株携带野生型或alteredrecA等位基因。这些菌株所显示的菌毛相位变化率和菌毛状态变化的遗传基础的检查表明,这些高频率事件需要recA介导的同源重组,并确认非菌毛状态是由所表达的菌毛蛋白基因突变引起的。在缺乏inrecA介导的同源重组的菌株中,菌毛相位变异以100-1000倍降低的速率发生,并且主要由菌毛蛋白结构基因内的一类自发移码突变引起。
Intragenic recombination between the single complete pilin gene (expression locus) and multiple, distinct, partial pilin gene copies (silent, storage loci) is thought to account for the generation of pilus antigenic diversity and piliation phase (on-off) changes exhibited byNeisseria gonorrhoeae. The mechanisms operating in the genomic rearrangements associated with these forms of pilus variation were investigated through the study of isogenic strains of gonococci bearing either wild-type or alteredrecAalleles. Examination of the rates of pilus phase variation and the genetic basis for changes in piliation status displayed by these strains show thatrecAmediated homologous recombination is required for these high frequency events and confirm that the nonpiliated state results from mutations in the expressed pilin gene. In a strain that is deficient inrecAmediated homologous recombination, pilus phase variation occurs at a 100-1000-fold reduced rate and results predominantly from one class of spontaneous frameshift mutations within the pilin structural gene.
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