Genetic analyses of trypanosoma cruzi isolates from naturally infected triatomines and humans in northeastern Brazil

A. C.J. Câmara, A. A. Varela-Freire, H. M.S. Valadares, A. M. Macedo, D. A. D'Ávila, C. R. Machado, E. Lages-Silva, E. Chiari, L. M.C. Galvão

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Trypanosoma cruzi genetic diversity was investigated in 25 isolates (vectors and humans) from the semiarid zone of the State of Rio Grande do Norte, Brazil. Molecular markers (3' region of the 24Sα rRNA; mitochondrial cytochrome oxidase subunit 2 (COII) gene; spliced leader intergenic region (SL-IR) gene; allelic size microsatellite polymorphism) identified 56% TcIII (100% Panstrongylus lutzi; 50% Triatoma brasiliensis); 40% TcII (91.7% humans; 50% T. brasiliensis) and 4% TcI (human). Microsatellite analysis revealed monoclonal and heterozygous patterns on one or more microsatellite loci in 64% of T. cruzi isolates (92.3% triatomines; 33.3% humans) and 36% putative polyclonal populations (66.7% humans; 7.7% triatomines) by loci SCLE10, SCLE11, TcTAT20, TcAAAT6, all belonging to TcII. Identical T. cruzi polyclonal profiles (88.9%) were detected, mostly from humans. The adaptative natural plasticity of TcII and TcIII and their potential for maintaining human infection in T. brasiliensis were confirmed. Intraspecific and phylogenetic T. cruzi diversity in the sylvatic and domestic transmission cycles in this specific region will provide exclusive control strategies.

Original languageEnglish
Pages (from-to)205-211
Number of pages7
JournalActa Tropica
Volume115
Issue number3
DOIs
StatePublished - Sep 2010
Externally publishedYes

Keywords

  • Chagas disease infection
  • Genomic markers
  • Panstrongylus lutzi
  • T. cruzi III
  • Triatoma brasiliensis
  • Trypanosoma cruzi

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