Bacteriophage ICP1: A Persistent Predator of Vibrio cholerae.

Bacteriophage ICP1: A Persistent Predator of Vibrio cholerae.
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DOI:
10.1146/annurev-virology-091919-072020
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发表时间:
2021-09-29
影响因子:
11.3
通讯作者:
--
中科院分区:
医学2区
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噬菌体或噬菌体--细菌的病毒--是丰富的,被认为是高度多样化的。有趣的是,国际腹泻病研究中心的一组特定的溶解性霍乱弧菌特异性噬菌体(弧菌噬菌体),孟加拉国霍乱噬菌体1(ICP 1)谱系在很大的时间和地理跨度上显示出高水平的基因组保守性,尽管与它们的宿主不断进行共同进化的军备竞赛。从收集的67个测序的ICP 1分离株,主要是从临床样本,我们发现这些病毒有马赛克基因组组成的大型,保守的模块破坏的可变序列,可能演变主要是通过移动的核酸内切酶介导的重组过程中共同感染。几个可变区与霍乱弧菌中抗噬菌体元件的适应有关;值得注意的是,这包括ICP 1的CRISPR-Cas系统。ICP 1和霍乱弧菌在霍乱流行地区的持续关联使该系统成为发现自然界细菌-噬菌体冲突中新防御和反防御策略的丰富来源。
Bacteriophages or phages—viruses of bacteria—are abundant and considered to be highly diverse. Interestingly, a particular group of lytic Vibrio cholerae–specific phages (vibriophages) of the International Centre for Diarrheal Disease Research, Bangladesh cholera phage 1 (ICP1) lineage show high levels of genome conservation over large spans of time and geography, despite a constant coevolutionary arms race with their host. From a collection of 67 sequenced ICP1 isolates, mostly from clinical samples, we find these phages have mosaic genomes consisting of large, conserved modules disrupted by variable sequences that likely evolve mostly through mobile endonuclease-mediated recombination during coinfection. Several variable regions have been associated with adaptations against antiphage elements in V. cholerae; notably, this includes ICP1’s CRISPR-Cas system. The ongoing association of ICP1 and V. cholerae in cholera-endemic regions makes this system a rich source for discovery of novel defense and counterdefense strategies in bacteria-phage conflicts in nature.
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