Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
Vol. 111, No. 5, 2016, pp. 322-329
Bioline Code: oc16046
Full paper language: English
Document type: Research Article
Document available free of charge
Memórias do Instituto Oswaldo Cruz, Vol. 111, No. 5, 2016, pp. 322-329
© Copyright 2016 - Memórias do Instituto Oswaldo Cruz
Assessing the mitochondrial DNA diversity of the Chagas disease vector Triatoma sordida (Hemiptera: Reduviidae)|
Pessoa, Grasielle Caldas D‘Ávila; Sousa, Tais Nóbrega de; Sonoda, Ivan Vieira & Diotaiuti, Liléia
Triatoma sordida is a species that transmits Trypanosoma cruzi to humans. In Brazil, T. sordida currently deserves
special attention because of its wide distribution, tendency to invade domestic environments and vectorial competence.
For the planning and execution of control protocols to be effective against Triatominae, they must consider its population
structure. In this context, this study aimed to characterise the genetic variability of T. sordida populations collected
in areas with persistent infestations from Minas Gerais, Brazil. Levels of genetic variation and population structure were
determined in peridomestic T. sordida by sequencing a polymorphic region of the mitochondrial cytochrome b gene.
Low nucleotide and haplotype diversity were observed for all 14 sampled areas; π values ranged from 0.002-0.006. Most
obtained haplotypes occurred at low frequencies, and some were exclusive to only one of the studied populations. Interpopulation
genetic diversity analysis revealed strong genetic structuring. Furthermore, the genetic variability of Brazilian
populations is small compared to that of Argentinean and Bolivian specimens. The possible factors related to the reduced
genetic variability and strong genetic structuring obtained for studied populations are discussed in this paper.
Triatominae; Triatoma sordida; cyt b diversity
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