Microbe-mediated host defence drives the evolution of reduced pathogen virulence.

Microbe-mediated host defence drives the evolution of reduced pathogen virulence.
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DOI:
10.1038/ncomms13430
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发表时间:
2016-11-15
影响因子:
16.6
通讯作者:
King, Kayla C.
King, Kayla C.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ford, Suzanne A.;Kao, Damian;Williams, David;King, Kayla C.

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保护宿主免受病原体侵害的微生物在自然界中广泛存在,是有吸引力的疾病控制剂。鉴于病原体对感染障碍的适应可以驱动病原体毒力的变化,“防御性微生物”可能会影响疾病的严重程度。在这里,我们表明,秀丽隐杆线虫宿主内具有宿主保护特性的微生物(粪肠球菌)和病原体(金黄色葡萄球菌)的共同进化驱动了病原体毒力降低的进化,这是适应防御性微生物的副产品。利用基因组和表型分析,我们发现病原体产生的清除铁的铁载体减少了防御微生物的适应性,并巩固了病原体毒力的下降。这些数据表明,防御微生物可以塑造病原体毒力的进化,病原体耐药性的机制可以决定毒力进化的方向。一些微生物保护它们的宿主免受病原体的侵害,并可能推动病原体的进化。在这里,Ford等人展示了一种宿主保护微生物在模式生物秀丽隐杆线虫中选择降低病原体的毒力。
Microbes that protect their hosts from pathogens are widespread in nature and are attractive disease control agents. Given that pathogen adaptation to barriers against infection can drive changes in pathogen virulence, ‘defensive microbes' may shape disease severity. Here we show that co-evolving a microbe with host-protective properties (Enterococcus faecalis) and a pathogen (Staphylococcus aureus) within Caenorhabditis elegans hosts drives the evolution of reduced pathogen virulence as a by-product of adaptation to the defensive microbe. Using both genomic and phenotypic analyses, we discover that the production of fewer iron-scavenging siderophores by the pathogen reduces the fitness of the defensive microbe and underpins the decline in pathogen virulence. These data show that defensive microbes can shape the evolution of pathogen virulence and that the mechanism of pathogen resistance can determine the direction of virulence evolution. Some microbes protect their hosts from pathogens and likely drive pathogens' evolution. Here, Ford et al. show that a host-protective microbe selects for reduced virulence of a pathogen in the model organism Caenorhabditis elegans.
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