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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 94, No. s1, 1999, pp. 229-238
Bioline Code: oc99168
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 94, No. s1, 1999, pp. 229-238

 en Mitochondrial DNA variation of Triatoma infestans populations and its implication on the specific status of T. melanosoma
Fernando A Monteiro; Ruben Pérez; Francisco Panzera; Jean-Pierre Dujardin; Cleber Galvão; Deyse Rocha; Francois Noireau; Chris Schofield & Charles B Beard

Abstract

DNA sequence comparison of 412 base-pairs fragments of the mitochondrial cytochrome B gene was used to infer the genetic structure of nine geographical Triatoma infestans populations and their phylogenetic relationship with T. melanosoma and T. brasiliensis. T. infestans and T. melanosoma were compared by morphometry, allozyme and cytogenetic analyses, as well as subjected to reciprocal crosses, in order to clarify the taxonomic status of the latter. No differences were found to distinguish the two species and the crosses between them yielded progeny. 

T. infestans populations presented four haplotypes that could be separated in two clusters: one formed by the samples from Bolivia (Andes and Chaco) and the other formed by samples from Argentina and Brazil. Silvatic and domestic T. infestans populations from Bolivia (Andes) were genetically identical.

Keywords
Triatoma infestans - Triatoma melanosoma - mitochondrial DNA - cytogenetics - allozymes - phylogeny - molecular systematics - Chagas disease vectors

 
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