Effect of CTXφ prophage deletion in cholera agent on expression of regulatory genes controlling virulence and biofilm formation
- Авторы: Smirnova N.1, Agafonov D.1, Kul’shan’ T.1, Shchelkanova E.1, Krasnov Y.1, Lozovsky Y.1, Kutyrev V.1
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Учреждения:
- Russian Research Anti-Plague Institute Microbe
- Выпуск: Том 53, № 3 (2017)
- Страницы: 302-313
- Раздел: Genetics of Microorganisms
- URL: https://journals.rcsi.science/1022-7954/article/view/188153
- DOI: https://doi.org/10.1134/S1022795417020119
- ID: 188153
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Аннотация
This work represents the results of comparative analysis of the nucleotide sequences in the chromosomal region containing CTXφ prophage in isogenic toxigenic (Tox+) and nontoxigenic (Tox–) strains of Vibrio cholerae biovar El Tor. It is shown that spontaneous mutants which have identical Tox– phenotype are formed either owing to the precise elimination of CTXφ prophage from the chromosome (deletion size is 6.9 kb) or owing to imprecise elimination with the additional loss of two other prophages (RS1φ and TLCφ), which are adjacent to CTXφ prophage (deletion size is 17.4 kb). It is revealed that, in the nontoxigenic mutants, CTXφ deletion initiates simultaneous change in several phenotypic properties, which are associated with virulence or biofilm formation, such as colonizing ability, HA/P production, VPS, and motility. For the first time, it is stated that the cause of the pleiotropic effect of the CTXφ deletion is a cascade decrease in the transcription levels of seven regulatory genes (toxR, aphA, tcpP, tcpH, toxT, vpsT, vpsR) which control virulence and biofilm formation processes in the cholera agent.
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Об авторах
N. Smirnova
Russian Research Anti-Plague Institute Microbe
Автор, ответственный за переписку.
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
D. Agafonov
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
T. Kul’shan’
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
E. Shchelkanova
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
Ya. Krasnov
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
Yu. Lozovsky
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005
V. Kutyrev
Russian Research Anti-Plague Institute Microbe
Email: rusrapi@microbe.ru
Россия, Saratov, 410005