Abstract
Aim. Analysis of the phenotypic characteristics and identification of peculiarities of the genotypic organization in non-toxigenic strains of cholera vibrios having different origin, isolated in Russia. Materials and methods. A sample of 548 non-toxigenic strains obtained using the author’s updated GIS “Cholera 1989–2014” was used. PCR genotyping was carried out in accordance with the patented “Method for the identification of non-toxigenic strains of cholera vibrio O1 serogroup using PCR to isolate genetic determinants.” Cluster analysis was performed applying the UPGMA method. The dendrogram was constructed using MEGA 5 software package.Results and discussion. Representative cultural-morphological, serological and biochemical properties of V. cholerae strains have been specified. The variability of the studied strains on the basis of phagolizability has been revealed. Unique phage-types not previously encountered in Russia have been identified. The population of non-toxigenic strains of cholera vibrio O139 serogroup is genetically homogeneous in contrast to V. cholerae O1 El Tor isolates and has identical PCR genotypes. The universality of the PCR genotyping by 14 target genes has been shown to differentiate the studied strains of V. cholerae O1 and O139, as well as to identify disparities among O139 strains isolated in different geographical regions of the country.
Highlights
Unique phage-types not previously encountered in Russia have been identified
The population of non-toxigenic strains of cholera vibrio O139 serogroup is genetically homogeneous in contrast to V. cholerae O1 El Tor isolates and has identical PCR genotypes
The universality of the PCR genotyping by 14 target genes has been shown to differentiate the studied strains of V. cholerae O1 and O139, as well as to identify disparities among O139 strains isolated in different geographical regions of the country
Summary
Фено- и генотипические особенности нетоксигенных штаммов холерных вибрионов различного происхождения, изолированных на территории России. Анализ фенотипической характеристики и выявление особенностей генотипической организации нетоксигенных штаммов холерных вибрионов, имеющих различное происхождение и изолированных на территории России. Использована выборка из 548 нетоксигенных штаммов, полученная с помощью авторской пополняемой ГИС «Холера 1989–2014». ПЦР-генотипирование проводили в соответствии со «Способом идентификации нетоксигенных штаммов холерных вибрионов О1 серогруппы с помощью ПЦР для выделения генетических детерминант». Кластерный анализ проводили с использованием метода UPGMA. Показана типичность штаммов V. cholerae по культурально-морфологическим, серологическим и биохимическим свойствам. Популяция нетоксигенных штаммов холерных вибрионов О139 серогруппы была генетически однородной в отличие от изолятов V. cholerae O1 El Tor и имела идентичные ПЦР-генотипы. Показана универсальность метода ПЦР-генотипирования по 14 генам-мишеням, позволяющего дифференцировать изученные штаммы V. cholerae О1 и O139, а также выявлять различия среди штаммов О139, выделенных в различных географических регионах страны. Pheno- and Genotypical Features of Non-Toxigenic Strains of Cholera Vibrios of Different Origins, Isolated in the Territory of Russia
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