High rate of mobilization for blaCTX-Ms.

High rate of mobilization for blaCTX-Ms.
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BLACTX-MS的高动员率。

DOI:
10.3201/eid1403.070405
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发表时间:
2008-03
影响因子:
11.8
通讯作者:
Tenover, Fred C.
Tenover, Fred C.
中科院分区:
医学2区
文献类型:
--
作者:
Barlow, Miriam;Reik, Rebecca A.;Jacobs, Stephen D.;Medina, Monica;Meyer, Matthew P.;McGowan, John E., Jr.;Tenover, Fred C.

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与其他A类β-内酰胺酶相比,blaCTX-ms更频繁地被动员到质粒上。我们构建了A类β-内酰胺酶的系统发育分析,发现BLACTX-ms被动员到≈上的频率是其他A类β-内酰胺酶的10倍。我们还发现blaCTX-ms是一个共同祖先的后代,该祖先在古代通过水平转移整合到Kluyvera物种祖先的染色体中。自从该基因被插入以来,在该祖先基因序列的后代之间发生了相当大的序列差异。这种差异主要发生在纯化选择的存在上,这表明在前抗菌药物时代,blaCTX-ms的进化速度很慢。
The blaCTX-Ms have been mobilized to plasmids more frequently than other class A β-lactamases. We constructed a phylogenetic analysis of class A β-lactamases and found that the blaCTX-Ms have been mobilized to plasmids ≈10 times more frequently than other class A β-lactamases. We also found that the blaCTX-Ms are descended from a common ancestor that was incorporated in ancient times into the chromosome of the ancestor of Kluyvera species through horizontal transfer. Considerable sequence divergence has occurred among the descendents of that ancestral gene sequence since that gene was inserted. That divergence has mainly occurred in the presence of purifying selection, which indicates a slow rate of evolution for blaCTX-Ms in the pre–antimicrobial drug era.
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发表时间: 2004-06-01
影响因子: 2.6
作者:
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通讯作者: Cooper, TE
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发表时间: 1983-01-01
期刊: NATURE
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