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Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition) ›› 2021, Vol. 15 ›› Issue (02): 129-132. doi: 10.3877/cma.j.issn.1674-1358.2021.02.010

Special Issue:

• Short Research Article • Previous Articles     Next Articles

Biofilm formation related genes of Acinetobacter baumannii

Fei Lin1, Mingyong Yuan1, Baodong Ling2,()   

  1. 1. Department of Pharmacy, The First Affiliated Hospital of Chengdu Medical College, Chengdu, China
    2. Sichuan Province College Key Laboratory of Structure-Speci?c Small Molecule Drugs, School of Pharmacy, Chengdu Medical College, Chengdu, China
  • Received:2020-04-29 Online:2021-04-15 Published:2021-06-15
  • Contact: Baodong Ling

Abstract:

Objective

To investigate the different biofilm formation ability of clinical isolation of Acinetobacter baumannii (A. baumannii) biofilm related genes.

Methods

A total of 47 A. baumannii clinical isolates from January 2014 to January 2015 in the First Affiliated Hospital of Chengdu Medical College were collected to analyze the biofilm formation by crystal violet staining assay. The biofilm genes abaI, bap, pgaA, pgaB, pgaC, pgaD, csuA/B, csuA, csuB, csuC, csuD, csuE, bfmR, bfmS, pglC, pglL, gacS, H-NS and ompA were detected by polymerase chain reaction. The clinical isolates biofilm formation ability elated genes were analyzed by Pearson Chi-square to analysis or Chi-square test with continuous correction.

Results

Thirteen isolates exhibited biofilm formation ability among 47 clinical isolates, and seventeen genes were detected. The detection rates of gene ompA、pgaC、pgaD and bfmR were all 100% (47/47), respectively. The detection rates of pglL and H-NS were both 0 (0/47), the ratios of bap and csuD were 17.02% (8/47) and 53.19% (25/47), respectively. The detection rate of other gene was > 85% (40/47). The detection rates of gene bap, pgaB, csuA/B, csuA, csuB and csuD were 53.85%, 92.31%, 100%, 100%, 92.31% and 53.85% in positive strains, respectively, which were 2.94%, 85.29%, 91.18%, 97.06%, 88.24% and 52.94%, respectively in negative strains. The detection rate of csuA/B and csuB were both 100% in positive strains and were 91.18% and 97.06% in negative isolates, respectively. The detection rates of bap gene were significantly different between positive (53.85%, 7/13) and negative (2.94%, 1/34) strains, with significant difference (χ2 = 13.838, P < 0.001), but there was no significant difference in the detection rates of other genes between positive and negative strains (all P > 0.05).

Conclusion

A. baumannii biofilm related gene bap may promote the ability of biofilm formation.

Key words: Acinetobacter baumannii, Biofilm, Gene

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