SYBR Green-based Real-Time PCR targeting kinetoplast DNA can be used to discriminate between the main etiologic agents of Brazilian cutaneous and visceral leishmaniases
| Autor: | Rosimar Batista Lima, Reginaldo Peçanha Brazil, Otacilio C. Moreira, Constança Britto, Daniela de Pita-Pereira, R. M. M. A. Lins, Bernardo Acácio Santini Pereira, Márcia Pereira de Oliveira |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Male
chemistry.chemical_compound Leishmaniases Organic Chemicals Child Conserved Sequence Phylogeny Leishmania thermal dissociation curves biology DNA Kinetoplast SYBR Green Real-time PCR kinetoplast DNA Real-time polymerase chain reaction Infectious Diseases Kinetoplast Child Preschool Quinolines Leishmaniasis Visceral Female Brazil Adolescent Molecular Sequence Data Leishmaniasis Cutaneous Computational biology Diamines Real-Time Polymerase Chain Reaction Rapid detection Sensitivity and Specificity lcsh:Infectious and parasitic diseases Species level parasitic diseases molecular diagnosis medicine Animals Humans lcsh:RC109-216 Benzothiazoles Fluorescent Dyes Base Sequence Research Leishmaniasis Sequence Analysis DNA biology.organism_classification medicine.disease Molecular biology Insect Vectors chemistry Parasitology Psychodidae Sequence Alignment DNA |
| Zdroj: | Parasites & Vectors, Vol 5, Iss 1, p 15 (2012) Parasites & Vectors |
| ISSN: | 1756-3305 |
| Popis: | Background Leishmaniases control has been hampered by the unavailability of rapid detection methods and the lack of suitable therapeutic and prophylactic measures. Accurate diagnosis, which can distinguish between Leishmania isolates, is essential for conducting appropriate prognosis, therapy and epidemiology. Molecular methods are currently being employed to detect Leishmania infection and categorize the parasites up to genus, complex or species level. Real-time PCR offers several advantages over traditional PCR, including faster processing time, higher sensitivity and decreased contamination risk. Results A SYBR Green real-time PCR targeting the conserved region of kinetoplast DNA minicircles was able to differentiate between Leishmania subgenera. A panel of reference strains representing subgenera Leishmania and Viannia was evaluated by the derivative dissociation curve analyses of the amplified fragment. Distinct values for the average melting temperature were observed, being 78.95°C ± 0.01 and 77.36°C ± 0.02 for Leishmania and Viannia, respectively (p < 0.05). Using the Neighbor-Joining method and Kimura 2-parameters, the alignment of 12 sequences from the amplified conserved minicircles segment grouped together L. (V.) braziliensis and L. (V.) shawii with a bootstrap value of 100%; while for L. (L.) infantum and L. (L.) amazonensis, two groups were formed with bootstrap values of 100% and 62%, respectively. The lower dissociation temperature observed for the subgenus Viannia amplicons could be due to a lower proportion of guanine/cytosine sites (43.6%) when compared to species from subgenus Leishmania (average of 48.4%). The method was validated with 30 clinical specimens from visceral or cutaneous leishmaniases patients living in Brazil and also with DNA samples from naturally infected Lutzomyia spp. captured in two Brazilian localities. Conclusions For all tested samples, a characteristic amplicon melting profile was evidenced for each Leishmania subgenus, corroborating the data from reference strains. Therefore, the analysis of thermal dissociation curves targeting the conserved kinetoplast DNA minicircles region is able to provide a rapid and reliable method to identify the main etiologic agents of cutaneous and visceral leishmaniases in endemic regions of Brazil. |
| Databáze: | OpenAIRE |
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