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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 95, No. 4, 2000, pp. 567-573
Bioline Code: oc00089
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 95, No. 4, 2000, pp. 567-573

 en Nuclear rDNA-based Molecular Clock of the Evolution of Triatominae (Hemiptera: Reduviidae), Vectors of Chagas Disease
MD Bargues; A Marcilla; JM Ramsey; JP Dujardin; CJ Schofield & S Mas-Coma

Abstract

The evolutionary history and times of divergence of triatomine bug lineages are estimated from molecular clocks inferred from nucleotide sequences of the small subunit SSU (18S) and the second internal transcribed spacer (ITS-2) of the nuclear ribosomal DNA of these reduviids. The 18S rDNA molecular clock rate in Triatominae, and Prosorrhynchan Hemiptera in general, appears to be of 1.8% per 100 million years (my). The ITS-2 molecular clock rate in Triatominae is estimated to be around 0.4-1% per 1 my, indicating that ITS-2 evolves 23-55 times faster than 18S rDNA. Inferred chronological data about the evolution of Triatominae fit well with current hypotheses on their evolutionary histories, but suggest reconsideration of the current taxonomy of North American species complexes.

Keywords
Chagas disease, Triatominae vectors, nuclear rDNA, 18S gene, ITS-2 spacer, molecular clock, evolution

 
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