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大学・研究所にある論文を検索できる 「Genomic characterisation and epidemiology of nosocomial Serratia marcescens isolates resistant to ceftazidime and their plasmids mediating rare bla TEM-61」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Genomic characterisation and epidemiology of nosocomial Serratia marcescens isolates resistant to ceftazidime and their plasmids mediating rare bla TEM-61

Hayashi, Wataru Yoshida, Satoshi Izumi, Katsutoshi Koide, Shota Soga, Eiji Takizawa, Shino Arakawa, Yoshichika Nagano, Yukiko Nagano, Noriyuki 信州大学 DOI:33762209

2022.11.14

概要

Objectives: We determined the whole DNA sequences of plasmids carrying a rare extended-spectrum beta-lactamase gene (bla(TEM-61)) to precisely understand the spread of resistance among nosocomial Serratia marcescens populations.
Methods: Twenty non-duplicate ceftazidime-resistant S. marcescens nosocomial isolates (ceftazidime MICs, 32 to >128 mg/L) collected over 1 year were pulsotyped and nucleotide sequences of the bla(TEM-61) gene and its promoter region were determined. Twelve representative isolates were analysed by whole-genome sequencing.
Results: The 20 isolates comprised two distinct pulsotypes: I (14 isolates) and II (6 isolates). They all contained the bla(TEM-61) gene. A polymorphism in the repeat number of a 15-nucleotide sequence (5'-ATGTCATGATAATAA-3') was found in the promoter region of bla(TEM-61); two, three and four repeat units were found in 6,12 and 2 isolates, respectively. Single nucleotide polymorphism (SNP)-based phylogenetic analysis of 12 isolates revealed that 7 isolates of pulsotype I (12-44 SNP differences) and 5 isolates of pulsotype II (15-55 SNP differences) formed two distinct clusters of genotypes 1 and 2, respectively. All 12 isolates harboured a plasmid carrying the Tn1-bla(TEM-61) element, although they were slightly different in size (78 883 bp, 78 898 bp and 78 913 bp) owing to differences in the number of 15-bp repetitive sequences. A 42 542-bp broad-host-range plasmid carrying the Tn1-bla(TEM-61) element was also found in one of the isolates. Conclusions: We characterised a plasmid-encoded novel Tn1-bla(TEM-61) element and transposon-dependent mechanisms underlying the propagation of antibiotic resistance, together with repeated new polymorphic 15-bp units in the promoter of bla(TEM-61). (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of International Society for Antimicrobial Chemotherapy.

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