β-Lactamase diversity in Acinetobacter baumannii.

IF 4.1 2区 医学 Q2 MICROBIOLOGY
Antimicrobial Agents and Chemotherapy Pub Date : 2025-03-05 Epub Date: 2025-02-10 DOI:10.1128/aac.00784-24
Andrew R Mack, Andrea M Hujer, Maria F Mojica, Magdalena A Taracila, Michael Feldgarden, Daniel H Haft, William Klimke, Arjun B Prasad, Robert A Bonomo
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引用次数: 0

Abstract

Acinetobacter baumannii is a clinically important, Gram-negative pathogen responsible for a wide variety of nosocomial and community-acquired infections. Antibiotic resistance is a serious concern, as the organism has a wide variety of intrinsic resistance mechanisms, including chromosomal class C (blaADC) and D (blaOXA-51 family) β-lactamases, and the ability to readily acquire additional β-lactamases. Surveillance studies can reveal the diversity and distribution of β-lactamase alleles, but are difficult and expensive to conduct. Herein, we describe an approach using publicly available data derived from whole genome sequences, to explore the diversity and distribution of β-lactamase alleles across 28,330 isolates. The most common intrinsic alleles at the time of writing were blaADC-73, blaADC-30, blaADC-222, blaADC-33, and blaOXA-66, and the most common acquired allele was blaOXA-23. Interestingly, only 63.0% of assigned blaADC alleles were encountered and the 10 most common blaADC and intrinsic blaOXA alleles represented approximately 75% of their respective gene totals while dozens were extremely infrequent. Differences were observed over time and geography. Surprisingly, more distinct unassigned (i.e., lacking a blaADC or blaOXA number) alleles were encountered than distinct, assigned alleles. Understanding the diversity and distribution of β-lactamase alleles helps to prioritize variants for further research, selects targets for drug development, and may aid in selecting therapies for a given infection.

鲍曼不动杆菌(Acinetobacter baumannii)是一种临床上很重要的革兰氏阴性病原体,可引起各种院内感染和社区获得性感染。抗生素耐药性是一个令人严重关切的问题,因为该病菌具有多种固有耐药机制,包括染色体 C 类(blaADC)和 D 类(blaOXA-51 家族)β-内酰胺酶,并能轻易获得更多的 β-内酰胺酶。监测研究可以揭示 β-内酰胺酶等位基因的多样性和分布情况,但开展这项研究既困难又昂贵。在本文中,我们介绍了一种利用从全基因组序列中获得的公开数据来探索 28,330 株分离株中β-内酰胺酶等位基因的多样性和分布的方法。在撰写本文时,最常见的固有等位基因是 blaADC-73、blaADC-30、blaADC-222、blaADC-33 和 blaOXA-66,最常见的获得性等位基因是 blaOXA-23。有趣的是,在分配的 blaADC 等位基因中,只有 63.0% 的等位基因被发现,10 个最常见的 blaADC 和固有 blaOXA 等位基因约占各自基因总数的 75%,而数十个等位基因则极不常见。随着时间和地域的不同,观察到的差异也不同。令人惊讶的是,未指定的等位基因(即没有 blaADC 或 blaOXA 编号)比已指定的等位基因更多。了解β-内酰胺酶等位基因的多样性和分布有助于确定进一步研究的变异体的优先次序,选择药物开发的目标,并有助于选择特定感染的治疗方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
10.00
自引率
8.20%
发文量
762
审稿时长
3 months
期刊介绍: Antimicrobial Agents and Chemotherapy (AAC) features interdisciplinary studies that build our understanding of the underlying mechanisms and therapeutic applications of antimicrobial and antiparasitic agents and chemotherapy.
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