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Identification of new loci involved in the host susceptibility to Salmonella Typhimurium in collaborative cross mice

机译:鉴定与协作型交叉小鼠中鼠伤寒沙门氏菌易感性有关的新基因座

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Salmonella is a Gram-negative bacterium causing a wide range of clinical syndromes ranging from typhoid fever to diarrheic disease. Non-typhoidal Salmonella (NTS) serovars infect humans and animals, causing important health burden in the world. Susceptibility to salmonellosis varies between individuals under the control of host genes, as demonstrated by the identification of over 20 genetic loci in various mouse crosses. We have investigated the host response to S. Typhimurium infection in 35 Collaborative Cross (CC) strains, a genetic population which involves wild-derived strains that had not been previously assessed. One hundred and forty-eight mice from 35 CC strains were challenged intravenously with 1000 colony-forming units (CFUs) of S. Typhimurium. Bacterial load was measured in spleen and liver at day 4 post-infection. CC strains differed significantly (P?
机译:沙门氏菌是一种革兰氏阴性细菌,可引起从伤寒到腹泻的多种临床综合征。非伤寒沙门氏菌(NTS)血清病毒感染人和动物,在世界上造成了重要的健康负担。沙门氏菌病的易感性在宿主基因控制下的个体之间有所不同,如在各种小鼠杂交中鉴定出20多个遗传基因座所证明的。我们已经调查了35个协作十字(CC)菌株对鼠伤寒沙门氏菌感染的宿主反应,这是一个遗传种群,其中涉及野生来源的菌株,之前尚未进行评估。用1000个鼠伤寒沙门氏菌菌落形成单位(CFU)对35个CC品系的148只小鼠进行静脉内攻击。在感染后第4天测量脾脏和肝脏中的细菌负荷。 CC菌株的脾脏和肝脏细菌负荷差异显着(P 0.0001),而性别和年龄均无影响。在脾脏细菌负荷中发现了两个显着的8号和10号显着数量性状位点(QTL)在染色体1中具有一个暗示性的QTL,而在染色体6和17号中发现了两个暗示性QTL用于肝中的细菌负载。这些QTL由独特的等位基因模式引起,主要涉及野生来源的创始人等位基因。使用八种CC创始菌株之间的序列变异结合数据库挖掘以在靶器官中表达和已知的免疫表型,我们能够优化QTL间隔并建立最有希望的候选基因列表。此外,我们确定了一种高度易感染鼠伤寒沙门氏菌的菌株CC042 / GeniUnc(CC042)。通过探索更广泛的遗传变异,协作十字种群揭示了新型的鼠伤寒沙门氏菌抗性基因座。这也导致将CC042鉴定为极易感菌株。

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