利用全基因组测序分析了7个杰氏棒状杆菌基因组种的耐药谱。

IF 5.4 2区 医学 Q1 MICROBIOLOGY
Michaela Fischer-Wellenborn, Frank Imkamp, Valéria Pereira Pires, Reinhard Zbinden, Nicolas Personnic
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引用次数: 0

摘要

杰氏棒状杆菌是一种具有高度基因组多样性的机会性人类病原体。在过去,多药耐药被认为是C. jekeium的一个标志。然而,有些菌株是完全敏感的,因此,它们的重新分类将避免用糖肽进行经验治疗。采用基质辅助激光解吸/电离飞行时间质谱(malti - tof MS)和16S核糖体RNA (16S rRNA)基因序列分析方法,对1994-1999年和2012-2019年鉴定的106株临床分离株和4株参比分离株进行了分析。采用全基因组测序(WGS)和盘片扩散药敏试验(AST)对153株jekeium分离菌进行分析。WGS和随后基于核心基因组单核苷酸多态性的系统发育分析将分离物分为7个系统发育簇。聚类之间的平均核苷酸同源性为95%,证明它们是独立的杰氏弧菌基因组种。总的来说,所有153个分离株的AST谱在16种抗生素中有6种是异质的。值得注意的是,基因组种6和7主要表现出相对较小的抑制区。对于其他10种抗生素,所有基因组种分别表现出小或大的抑制区。我们的研究揭示了一个相对复杂的系统发育结构。一旦通过常规诊断测试可以将明确的表型特征归因于七个基因组种,就应该对主要包括抗生素敏感菌株的基因组种进行重新分类,以微调潜在的治疗策略。耶氏芽孢杆菌通常表现出多药耐药(MDR),经常引发糖肽的经经验治疗。然而,一些菌株对多种抗生素敏感。本研究通过全基因组测序(WGS)和抗生素耐药性检测对大量大肠杆菌进行分析,揭示了其基因组多样性,以及耐多药表型与特定基因组种之间的相关性。虽然WGS还不是一种常规方法,但对耐多药基因组物种的鉴定可能会证实糖肽治疗的必要性。鉴定耐药程度较低的基因组物种将具有更高的临床影响,因为避免了不必要的糖肽治疗,从而减少了对万古霉素耐药肠球菌的选择。在未来,诊断工具的数据库,如MALDI-TOF,可能会扩展到允许基因组物种的区分。此外,对某些杰氏弧菌基因组种进行合理的分类学重新分类,将有助于临床医生微调潜在的治疗策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Antibiotic resistance profiles of seven genomospecies of Corynebacterium jeikeium analyzed by whole genome sequencing.

Corynebacterium jeikeium is an opportunistic human pathogen with high genomic diversity. In the past, multi-drug resistance has been considered a hallmark of C. jeikeium. However, some strains of C. jeikeium are fully susceptible and thus, their reclassification would avoid the empirical therapy with glycopeptides. One hundred eighty-six clinical isolates and four reference isolates identified as C. jeikeium between 1994-1999 and 2012-2019, respectively, were analyzed by matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) and 16S ribosomal RNA (16S rRNA) gene sequence analysis. A total of 153 confirmed C. jeikeium isolates was further analyzed by whole genome sequencing (WGS) and by disk diffusion antimicrobial susceptibility testing (AST). WGS and subsequent core genome single nucleotide polymorphism-based phylogenetic analysis segregated the isolates into seven phylogenetic clusters. The average nucleotide identity between the clusters was <95%, qualifying them as separate C. jeikeium genomospecies. Overall, AST profiles of all 153 isolates were heterogeneous for six of the 16 antibiotics tested. Notably, genomospecies 6 and 7 displayed mainly comparably small inhibition zones. For the other 10 antibiotics, all genomospecies displayed either small or large inhibition zones, respectively. Our study of C. jeikeium clinical isolates revealed a relatively complex phylogenetic structure. As soon as clear phenotypic traits can be attributed to the seven genomospecies by routine diagnostic tests, genomospecies encompassing mainly antibiotic-susceptible strains should be reclassified to fine-tune potential treatment strategies.IMPORTANCECorynebacterium jeikeium isolates typically display multi-drug resistance (MDR), frequently triggering empirical therapies with glycopeptides. However, some strains are susceptible to a broad range of antibiotics. In our study, analysis of a large collection of C. jeikeium by whole genome sequencing (WGS) and antibiotic resistance testing revealed genomic diversity, and some correlations between MDR phenotypes and specific genomospecies. While WGS is not yet a routine method, identification of MDR genomospecies may confirm the need for glycopeptide therapy. Identification of a less-resistant genomospecies would have even a higher clinical impact, as unnecessary therapies with glycopeptides are avoided, thereby reducing the selection for vancomycin-resistant enterococci. In the future, databases of diagnostic tools, e.g., MALDI-TOF, may be expanded to allow for the differentiation of genomospecies. Furthermore, rational taxonomic reclassification of some C. jeikeium genomospecies would help clinicians to fine-tune potential treatment strategies.

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来源期刊
Journal of Clinical Microbiology
Journal of Clinical Microbiology 医学-微生物学
CiteScore
17.10
自引率
4.30%
发文量
347
审稿时长
3 months
期刊介绍: The Journal of Clinical Microbiology® disseminates the latest research concerning the laboratory diagnosis of human and animal infections, along with the laboratory's role in epidemiology and the management of infectious diseases.
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