Worldwide diversity of Klebsiella pneumoniae that produce beta-lactamase blaKPC-2 gene.

Worldwide diversity of Klebsiella pneumoniae that produce beta-lactamase blaKPC-2 gene.
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DOI:
10.3201/eid1609.091389
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发表时间:
2010-09
影响因子:
11.8
通讯作者:
Nordmann P
Nordmann P
中科院分区:
医学2区
文献类型:
--
作者:
Cuzon G;Naas T;Truong H;Villegas MV;Wisell KT;Carmeli Y;Gales AC;Venezia SN;Quinn JP;Nordmann P

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TOC 摘要:携带具有相同遗传结构的不同质粒的克隆可能是全球传播的起源。产生碳青霉烯酶 (KPC) 的肺炎克雷伯菌分离株正在全球范围内迅速传播。为了确定它们的遗传背景,我们调查了来自 5 个国家的 16 个携带 blaKPC-2 的肺炎克雷伯菌分离株。这些分离株具有多重耐药性,具有 blaKPC-2 基因,并因额外的 β-内酰胺酶含量而有所不同。它们拥有天然染色体编码的 bla 基因(blaSHV-1 [12.5%]、blaSHV-11 [68.7%] 或 blaOKP-A/B [18.8%])和几个后天获得的质粒编码基因(blaTEM-1 [81.3%]、blaCTX-M-2 [31.3%]、blaCTX-M-12 [12.5%]、 blaCTX-M-15 [18.7%] 和 blaOXA-9 [37.5%])。 blaKPC-2 基因始终与 1 个 Tn4401 同工型(a、b 或 c)相关。 Tn4401 被插入到属于不同不相容组的不同大小的质粒上。发现了几个含有 blaKPC 的肺炎克雷伯菌克隆:9 种不同的脉冲型,具有 1 个主要(序列类型 258)和 7 个次要的不同等位基因谱。不同的克隆携带不同的质粒,但具有相同的遗传结构 Tn4401,可能是这种新兴抗性基因在全球范围内传播的起源。
TOC summary: Clones harboring different plasmids with identical genetic structure could be the origin of worldwide spread. Klebsiella pneumoniae isolates that produce carbapenemases (KPCs) are rapidly disseminating worldwide. To determine their genetic background, we investigated 16 blaKPC-2-harboring K. pneumoniae isolates from 5 countries. The isolates were multidrug resistant, possessed the blaKPC-2 gene, and differed by additional β-lactamase content. They harbored a naturally chromosome-encoded bla gene (blaSHV-1 [12.5%], blaSHV-11 [68.7%], or blaOKP-A/B [18.8%]) and several acquired and plasmid-encoded genes (blaTEM-1 [81.3%], blaCTX-M-2 [31.3%], blaCTX-M-12 [12.5%], blaCTX-M-15 [18.7%], and blaOXA-9 [37.5%]). The blaKPC-2 gene was always associated with 1 of the Tn4401 isoforms (a, b, or c). Tn4401 was inserted on different-sized plasmids that belonged to different incompatibility groups. Several blaKPC-containing K. pneumoniae clones were found: 9 different pulsotypes with 1 major (sequence type 258) and 7 minor distinct allelic profiles. Different clones harboring different plasmids but having identical genetic structure, Tn4401, could be at the origin of the worldwide spread of this emerging resistance gene.
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发表时间: 1984-01-01
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影响因子: 2.6
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