Otimização de ensaios de PCR para a detecção específica de Leishmania chagasi

• Autor(a) principal: SILVEIRA NETO, Osvaldo José da
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000001w22
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/944
• topic: cães; diagnóstico; leishmaniose; pcr; iniciadores; diagnosis; dogs; leishmaniasis; pcr; primers; CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS::TECNOLOGIA DE ALIMENTOS

The visceral leishmaniasis (LV) is a very important disease in public health, including zoonosis caused by members of Leishmania gender, occurring in many regions of the world. Several methods are being used to diagnose these diseases; among these methods are the Enzyme Linked Immuno Sorbent Assay (ELISA), indirect immunofluorescence reaction (RIFI) and direct examination by microscope. As none of these techniques allows a fast and sensitive diagnostic, methods of molecular diagnosis based on polymerase chain reaction (PCR) were developed. Recently, many groups have shown that PCR is a sensitive and specific method to Leshmania DNA detection in a variety of samples of humans, dogs and other animals. The protocols developed until these days to the parasite diagnose by PCR, although they be effective in the identification of the genomic DNA target, promote some inespecific amplifications or are inconclusive in the distinction of L.chagasi from other species of the gender. This work`s objective was the construction of speciesspecific iniciadores to detection of L.chagasi, and evaluation of protocols described by other authors, aiming LV diagnosis. The primers were selected from the alignment of 18S rRNA gene sequences and also of the LSU rRNA. Were selected six new pairs of species-specific primers for L. chagasi. Besides these new pairs were assessed seven other pairs of primers described in the literature. The results showed that the new primer pairs LCS2/LCS3 LCS1/LCS3 were efficient for the species-specific amplification of DNA fragments of L. chagasi of 259 bp and 820 bp, respectively. In the other hand the two new PCR assays optimized in this study using the primer pairs and LCS1/LCS3 LCS2/LCS3 were effective for species-specific detection of up to 1 pg / mL of DNA from L. chagasi. The pairs of primers MC1/MC2 as well as the pair of primers PIA-94 were effective for the discrimination of species-specific L. chagasi.Other pairs of primers evaluated didn´t showed a satisfactory results regarding the specificity for L. chagasi.