Detection of CRISPR‒Cas and Type I R-M Systems in of Human and Animal Origins and Their Relationship to Antibiotic Resistance and Virulence

Overview

Journal Microbiol Spectr

Specialty Microbiology

Date 2024 Dec 19

PMID 39699265

Authors

Xue Li

Ling Wang

Jinghuan Lin

Yingjuan Gu

Zhihua Liu

Jing Hu

Affiliations

Soon will be listed here.

Abstract

The clustered regularly interspaced short palindromic repeats (CRISPR)‒CRISPR-associated protein (Cas) and restriction‒modiﬁcation (R-M) systems are important immune systems in bacteria. Information about the distributions of these two systems in from different hosts and their mutual effect on antibiotic resistance and virulence is still limited. In this study, the whole genomes of 520 strains of from GenBank, including 325 from humans and 195 from animals, were collected for CRISPR‒Cas systems and type I R-M systems, virulence genes, antibiotic resistance genes, and multilocus sequence typing detection. The results showed that host origin had no obvious influence on the distributions of the two systems (CRISPR‒Cas systems in 29.8% and 24.1%, type I R-M systems in 9.8% and 11.8% of human-origin and animal-origin strains, respectively) in . Identical spacer sequences from different hosts demonstrated there was a risk of human-animal transmission. All virulence genes (yersiniabactin, colibactin, aerobactin, salmochelin, , and ) detection rates were higher when only the CRISPR‒Cas systems were present but were all reduced when coexisting with type I R-M systems. However, a lower prevalence of most antibiotic-resistance genes was found when the CRISPR‒Cas systems were alone, and when type I R-M systems were coexisting, some of the antibiotic resistance gene incidence rates were even lower (quinolones, macrolides, tetracyclines and carbapenems), and some of them were higher instead (aminoglycosides, clindamycins, rifampicin-associated, sulfonamides, methotrexates, beta-lactamases and ultrabroad-spectrum beta-lactamases). The synergistic and opposed effects of the two systems on virulence and antibiotic-resistance genes need further study.IMPORTANCE is an important opportunistic pathogen responsible for both human and animal infections, and the emergence of hypervirulent and multidrug-resistant has made it difficult to control this pathogen worldwide. Here, we find that CRISPR‒Cas and restriction-modification systems, which function as adaptive and innate immune systems in bacteria, have synergistic and opposed effects on virulence and antibiotic resistance genes in . Moreover, this study provides insights into the distributions of the two systems in from different hosts, and there is no significant difference in the prevalence of the two systems among spp. In addition, this study also characterizes the CRISPR arrays of from different hosts, suggesting that the strains sharing the same spacer sequences have the potential to spread between humans and animals.

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