RESUMO
Triatoma venosa presents a restricted geographical distribution in America and is considered as a secondary vector of Chagas disease in Colombia and Ecuador. A total of 120 adult insects were collected in domestic and peridomestic habitats in an endemic area of the department of Boyacá, Colombia, in order to determine their genetic structure through morphometric and molecular techniques. The head and wings of each specimen were used for the analyses of size, shape, and sexual dimorphism. A significant sexual dimorphism was found, although no differences in size among the studied groups were detected. Differences were found in the analyzed structures except for male heads. DNA was extracted from the legs in order to carry out the internal transcriber space-2 (ITS-2) amplification and the randon amplified polymorphic DNA (RAPD) analyses. Length polymorphisms were not detected in the ITS-2. Fst and Nm values were estimated (0.047 and 3.4, respectively). The high genetic flow found among the insects captured in the domicile and peridomiciliary environment does not permit a genetic differentiation, thus establishing the peridomicile as an important place for epidemiological surveillance.
Assuntos
DNA Espaçador Ribossômico/genética , Insetos Vetores/genética , Triatoma/genética , Animais , Feminino , Genética Populacional , Insetos Vetores/anatomia & histologia , Masculino , Técnica de Amplificação ao Acaso de DNA Polimórfico , Caracteres Sexuais , Triatoma/anatomia & histologiaRESUMO
Triatoma venosa presents a restricted geographical distribution in America and is considered as a secondary vector of Chagas disease in Colombia and Ecuador. A total of 120 adult insects were collected in domestic and peridomestic habitats in an endemic area of the department of Boyacá, Colombia, in order to determine their genetic structure through morphometric and molecular techniques. The head and wings of each specimen were used for the analyses of size, shape, and sexual dimorphism. A significant sexual dimorphism was found, although no differences in size among the studied groups were detected. Differences were found in the analyzed structures except for male heads. DNA was extracted from the legs in order to carry out the internal transcriber space-2 (ITS-2) amplification and the randon amplified polymorphic DNA (RAPD) analyses. Length polymorphisms were not detected in the ITS-2. Fst and Nm values were estimated (0.047 and 3.4, respectively). The high genetic flow found among the insects captured in the domicile and peridomiciliary environment does not permit a genetic differentiation, thus establishing the peridomicile as an important place for epidemiological surveillance.
Assuntos
Animais , Masculino , Feminino , DNA Espaçador Ribossômico/genética , Insetos Vetores/genética , Caracteres Sexuais , Triatoma/genética , Genética Populacional , Insetos Vetores/anatomia & histologia , Técnica de Amplificação ao Acaso de DNA Polimórfico , Triatoma/anatomia & histologiaRESUMO
Introducción. La ateroesclerosis es la principal causa de enfermedad coronaria y cerebrovascular, las cuales, a su vez, son las causas más comunes de mortalidad y morbilidad n el mundo occidental. Publicaciones recientes sugieren que ciertos microorganismos infecciosos podrían jugar un papel importante en la génesis y progresión de la aterosclerosis. De acuerdo con reportes seroepidemiológicos y de detección directa, Chlamydia pneumoniae podría ser el candidato más plausible. No obstante, no se ha determinado su papel específico en el proceso aterogénico, por lo cual en los últimos años ha surgido la necesidad de explorar diversas técnicas de detección de C. pneumoniae en arterias. Objetivo. El propósito de este estudio fue investigar la presencia de C. pneumoniae en muestras de tejido aórtico de catorce pacientes sometidos a cirugía de reemplazo aórtico, utilizando la amplificación del gen kdtA por PCR acoplada a un ensayo de hibridación in vitro. Materiales y métodos. De cada uno de catorce segmentos de aorta se obtuvo una muestra al azar para la extracción de ADN y la detección de C. pneumoniae por PCR-hibridación in vitro. Resultados. Doce (85,7 por ciento) de catorce muestras de tejido de aorta resultaron positivas para C. pneumoniae. Conclusión. Los resultados encontrados en este estudio sugieren que la presencia de C. pneumoniae es frecuente en el tipo de muestras analizado. En estudios posteriores resultaría importante examinar si esta proporción se mantiene en una muestra poblacional mayor
Assuntos
Doenças da Aorta/complicações , Infecções por Chlamydia , Chlamydophila pneumoniae/isolamento & purificação , Amplificação de Genes , Técnicas In Vitro , Hibridização Genética , Reação em Cadeia da PolimeraseRESUMO
INTRODUCTION: Atherosclerosis is the main cause of coronary and cerebrovascular disease which, in turn, are the most common causes of mortality and morbidity in the western world. Recent publications suggest that infective microorganisms may play an important role in the genesis and progression of atherosclerosis. According to seroepidemiological and direct detection reports, Chlamydia pneumoniae is the most plausible candidate. Nevertheless, the mechanisms by which the microorganism induces its pathological effect have not yet been conclusively determined; hence, the need exists to explore different detection techniques of C. pneumoniae on arteries. OBJECTIVE: The purpose of the current study was to detect the presence of C. pneumoniae in aortic tissue samples from 14 patients submitted to aortic replacement surgery. Detection method involved kdtA gene amplification coupled with an in vitro hybridization assay. MATERIALS AND METHODS: Samples of aortic tissue for DNA extraction and C. pneumoniae detection by PCR-in vitro hybridization were randomly obtained from each of 14 aorta specimens. RESULTS: C. pneumoniae was detected in 12 (85.7%) of the 14 aortic tissue samples. CONCLUSIONS: This result indicates a frequent association of C. pneumoniae with aortic tissue disease. Further studies are required to determine if this proportion of positive samples persists within larger samples.