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首页> 外文期刊>Journal of Clinical Microbiology >Identification of a Gene Encoding Heat-Resistant Agglutinin in Escherichia coli as a Putative Virulence Factor in Urinary Tract Infection
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Identification of a Gene Encoding Heat-Resistant Agglutinin in Escherichia coli as a Putative Virulence Factor in Urinary Tract Infection

机译:编码大肠杆菌中耐热凝集素基因作为泌尿道感染的潜在毒力因子的鉴定

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Escherichia coli causes the vast majority of urinary tract infections (UTI) in both ambulatory and hospital patients. Several uropathogenic virulence factors have been identified, but half of all E. coli isolates that cause UTI have none or only one of the known virulence factors. Thus, it is reasonable to presume that other bacterial factors may be important in UTI pathogenesis. In order to find additional uropathogenic E. coli genes, we used genomic subtraction to identify DNA regions present in a uropathogenic strain of E. coli (1128-11). Genomic subtraction yielded 40 tester-specific fragments, including a novel heat-resistant agglutinin (hra) gene fragment. hra occurred in 55% of 486 UTI strains compared to 28% of 165 rectal strains (P = 0.001). The hra gene in 1128-11 was cloned, sequenced, and found to have 91% homology to the hra gene from E. coli meningitis strain RS218. The genetic organization of genes flanking hra in 1128-11 is distinct from the hra found in E. coli strains J96 and RS218. In our UTI and rectal specimen collections, hra was positively associated with a number of known virulence genes, including pathogenicity island genes hly and cnf, which are absent in 1128-11. The presence of hra in 1128-11 independent of hly/cnf suggests multiple mechanisms by which hra can be acquired by pathogenic E. coli strains. The flanking genes suggest that in 1128-11, hra may be part of a novel variant of a pathogenicity island V.
机译:大肠杆菌在非卧床和住院患者中引起绝大多数尿路感染(UTI)。已经鉴定出几种尿毒症致病因子,但所有 E中有一半。导致尿路感染的大肠杆菌分离株没有或只有一种已知的毒力因子。因此,可以合理地假设其他细菌因素在UTI发病机理中可能很重要。为了找到其他尿毒原性的 E。大肠杆菌基因,我们使用基因组减法来鉴定 E尿毒症毒株中存在的DNA区域。大肠杆菌(1128-11)。基因组扣除产生了40个测试员特异性片段,包括一个新型的耐热凝集素( hra )基因片段。 hra 发生在486支UTI菌株中的55%,而165支直肠直肠菌株中的28%( P = 0.001)。克隆,测序了1128-11年的 hra 基因,发现与 E的 hra 基因具有91%的同源性。大肠杆菌脑膜炎菌株RS218。 1128-11年位于 hra 侧翼的基因的遗传组织与 E中发现的 hra 不同。大肠杆菌J96和RS218菌株。在我们的尿路感染和直肠标本中, hra 与许多已知的毒力基因正相关,包括致病性岛基因 hly cnf ,在1128-11年缺席。独立于 hly / cnf hra 在1128-11中的存在提示病原体 E可以通过其获取 hra 的多种机制。大肠杆菌菌株。侧翼基因提示在1128-11年, hra 可能是致病岛V的一个新变体的一部分。

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