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Aquaculture suffers from a number of diseases caused by Aeromonas hydrophila. Biofilm can protect bacteria from antibiotic therapy. To identify the genes those play crucial roles in A. hydrophila biofilm formation, a library of mini-Tn10 transposon insertion mutants of A. hydrophila B11 has been constructed, and 10 mutants were subjected to biofilm formation assay. The biofilm formation ability of mutant (B188) was significantly decreased compared with B11. The DNA sequence flanking the mini-Tn10 transposon inserted showed that an ORF of approximately 576 bp of the mutant strain B188 was inserted. This ORF putatively displays the highest identity (92%) with the cytochrome c4 gene (cyt-c4) of A. hydrophila subsp. hydrophila ATCC 7966. Silencing cyt-c4 led to deficiencies in biofilm formation, adhesion, drug resistance and pathogenicity of A. hydrophila, which suggests that cyt-c4 plays crucial role in the biofilm formation and virulence mechanisms of A. hydrophila. ABBREVIATIONS: GEN: gentamycin; SDZ: sulfadiazine; AK: amikacin; P: penicillin; CFP: cefoperazone; LEV: levofloxacin; MH: minocycline; FFC: florfenicol; TE: tetracycline; AMP: ampicillin; KAN: kanamycin; STR: streptomycin; SXT: sulfamethoxazole/trimethoprim; DO: doxycycline; OT: Oxytetracycline.

Silencing of cyt-c4 led to decrease of biofilm formation in Aeromonas hydrophila