Genetic Diversity of CMY Beta-Lactamase Genes in Clinical Isolates of Escherichia coli in Myanmar: Identification of Three Novel Types and Updated Phylogenetic Classification of blaCMY
| Autor: | Meiji Soe Aung, Pyae Phyo Thu, Nobumichi Kobayashi, Nilar San, Myat Su Hlaing, Thida San, Thin Thin Mar, Yi Yi Myint, Mya Mya Lwin, Win Win Maw, Noriko Urushibara, Balasubramanian Ganesh |
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| Rok vydání: | 2020 |
| Předmět: |
Microbiology (medical)
Immunology chemical and pharmacologic phenomena medicine.disease_cause complex mixtures Microbiology 03 medical and health sciences parasitic diseases Genotype medicine Escherichia coli 030304 developmental biology Pharmacology 0303 health sciences Genetic diversity Phylogenetic tree biology 030306 microbiology Nucleic acid sequence bacterial infections and mycoses biology.organism_classification Enterobacteriaceae Citrobacter freundii therapeutics Phylogenetic nomenclature |
| Zdroj: | Microbial Drug Resistance. 26:497-504 |
| ISSN: | 1931-8448 1076-6294 |
| DOI: | 10.1089/mdr.2019.0234 |
| Popis: | The dissemination of CMY-type enzymes, one of the plasmid-mediated AmpC beta-lactamases, among Enterobacteriaceae has become an important public health concern. In this study, genetic diversity of CMY beta-lactamase genes was investigated for 50 blaCMY-positive isolates detected from 426 clinical isolates of Escherichia coli in Yangon, Myanmar. CMY genes were differentiated into 9 types, with blaCMY-42 being predominant (22 isolates, 44%), followed by blaCMY-2, blaCMY-6, blaCMY-146, and included three novel types (CMY-156, CMY-158, CMY-159). Among E. coli harboring blaCMY, phylogenetic group D-sequence type (ST)405 and A-ST410 were the most common genotypes, and blaCTX-M-15 was detected in 72% (36/50) of isolates. blaCMY-42 was distributed to phylogenetic groups A, B1, and D E. coli with 11 STs, which included 10 isolates harboring carbapenemase genes (blaNDM-4, blaNDM-5, or blaNDM-7). Phylogenetic analysis of all the blaCMY genes reported to date, including the three novel types in the present study, revealed the presence of at least four distinct genetic groups, that is, CMY-1, CMY-2, CMY-70, and CMY-98 group, showing less than 91% nucleotide sequence identities among different groups. CMY-2 group beta-lactamase genes, which contained by far the largest number of CMY types (89.7%) with extensive diversity, were divided into two clusters (I and II). While eight CMY types identified in the present study were classified into CMY-2 group cluster I, novel type CMY-159 was assigned into CMY-98 group with a Citrobacter freundii strain in Thailand. |
| Databáze: | OpenAIRE |
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