Car-R/Ceph-S 的铜绿假单胞菌 OprD 基因突变分析.

Objective To study the mutation types of OprD gene in Pseudomonas aeruginosa resistant to carbapenems but sensitive to cephalosporins （Car-R/Ceph-S）. Methods Ten strains of Pseudomonas aeruginosa which were resistant to carbapenems but sensitive to cephalosporins were isolated and cultured in the First Affiliated Hospital of Kunming Medical University from January 2021 to March 2021. Polymerase chain reaction （PCR） was used to detect the carrying status of OprD gene in Pseudomonas aeruginosa, and the mutation type of OprD gene was analyzed by sequencing. Results All the 10 strains showed obvious OprD bands and the sequencing analysis showed that there were 2 frameshift mutations, 8 amino acid substitutions, 2 early termination codons and 4 large fragment deletions. Conclusion The mutation types of OprD gene in carbapenem-resistant but cephalosporin-sensitive （Car-R/Ceph-S） strains of Pseudomonas aeruginosa are diversified with the highest frequency of point mutations, deletion of large segments and early termination of codons. These mutations lead to changes in the structure of OprD, resulting in the occurrence of drug resistance. [ABSTRACT FROM AUTHOR]