Analysis of the features of 45 identified CRISPR loci in 32 Staphylococcus aureus.

Analysis of the features of 45 identified CRISPR loci in 32 Staphylococcus aureus.
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32 种金黄色葡萄球菌中 45 个已鉴定 CRISPR 位点的特征分析。

DOI:
10.1016/j.bbrc.2015.07.062
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发表时间:
2015-08
期刊:
Biochem Biophys Res Commun
影响因子:
--
通讯作者:
Haiyan Yang
Haiyan Yang
中科院分区:
其他
文献类型:
--
作者:
Siyu Yang;Jing Liu;Fuye Shao;Pengfei Wang;Guangcai Duan;Haiyan Yang

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金黄色葡萄球菌(S. aureus)是一种常见的病原体,可导致严重感染,甚至死亡。由于抗生素耐药基因的水平基因转移(HGT),耐药状况变得越来越普遍。最近,发现并证明了一种称为成簇规则间隔短回文重复序列(CRISPR)的适应性免疫系统,可以防御可能携带抗生素抗性基因的外来入侵元件。在本研究中,我们揭示了 CRISPR 数据库中 32S.aureus 菌株中 45 个已识别的 CRISPR 位点和 CRISPR 相关基因 (Cas) 的特征。 S.aureus08BA02176和MSHR1132的5个间隔区与来自噬菌体或质粒的外源基因序列同源,甚至含有与某些含有编码PVL毒素的lukPV基因的噬菌体基因组的部分相同的间隔区序列。许多具有相同 CRISPR 类型的金黄色葡萄球菌菌株共享相同的 MLST 类型。具有3个或更多相似蛋白质位点的CRISPR位点大多属于相同的CRISPR类型。我们得出的结论是菌株08BA02176和MSHR1132的CRISPR/Cas遗传自共同祖先或从路邓葡萄球菌重组。 CRISPR基因座可以被动员并可以在不同但密切相关的物种之间转移,并且相同类型的MLST菌株对相同类型的CRISPR基因座表现出更高的亲和力。噬菌体可能是金黄色葡萄球菌面临的主要挑战。 CRISPR/Cas结构可能限制金黄色葡萄球菌之间细菌毒力的传播。
Staphylococcus aureus(S. aureus) is a common pathogen that can cause serious infections, even death. Because of the horizontal gene transfer (HGT) of antibiotic resistance genes, the drug resistant condition is becoming increasingly prevalent. Recently, an adaptive immunity system, named clustered regularly interspaced short palindromic repeats (CRISPR), was discovered and demonstrated to confer a defense against foreign invading elements that may carry the antibiotic resistance genes. In this study, we reveal the features of 45 identified CRISPR loci and the CRISPR associated gene (Cas) in 32S.aureusstrains from CRISPR database. Five spacers ofS.aureus08BA02176 and MSHR1132 were homologous with foreign genetic sequences from phages or plasmids, even containing a spacer sequence identical to part of some phages' genomes containing lukPV gene that encodes the PVL toxin. ManyS.aureusstrains with the same CRISPR type shared the same MLST type. CRISPR loci that had 3 or more similar protein loci mostly belonged to the same CRISPR type. We came to the conclusion that the CRISPR/Cas of strains 08BA02176 and MSHR1132 were inherited from a common ancestor or recombined fromStaphylococcus lugdunensis. CRISPR loci can be mobilized and can transfer among different but closely related species, and the same types of MLST strains exhibit a higher affinity to the same types of CRISPR loci. Bacteriophages may be the predominant challenge facingS.aureus. The CRISPR/Cas structure may limit the transmission of bacterial virulence amongS.aureus.
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