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Expression of virulence and stress response genes in Aeromonas hydrophila under various stress conditions
Author(s) -
Nagar Vandan,
Bandekar Jayant R.,
Shashidhar Ravindranath
Publication year - 2016
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.201600107
Subject(s) - aeromonas hydrophila , virulence , rpos , housekeeping gene , biology , microbiology and biotechnology , gene , gene expression , pathogen , bacteria , genetics , promoter
Aeromonas hydrophila has emerged as an important human pathogen as it causes gastroenteritis and extra‐intestinal infections. Information regarding the influence of environmental stresses on gene expression profile of A. hydrophila is lacking. The impact of nutrient replenishment, nutrient deprivation, acid stress, and cold shock on housekeeping, general stress‐response, and virulence genes was studied using quantitative real‐time PCR in two A. hydrophila strains, CECT 839 T , and A331. These sub‐lethal stresses invoked significant changes in the expression of these genes in a strain‐dependent manner. Overall, nutrient replenishment and deprivation significantly induced the expression of housekeeping ( rpoD ), general stress regulators ( uspA and rpoS ), and virulence ( aer ) genes, indicating their importance in regulating the survival and virulence of A. hydrophila under these stress conditions. rpoS gene was significantly induced under cold shock; whereas, acid stress significantly induced the expression of uspA gene. This is the first study to investigate the effect of environmental parameters on the expression of stress‐response and virulence genes in A. hydrophila strains.