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Amazonian malaria vector anopheline relationships interpreted from ITS2 rDNA sequences.

M T Marrelli1, L M Floeter-Winter, R S Malafronte

  • 1Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de Sao Paulo, Sao Paulo, Brazil.

Medical and Veterinary Entomology
|June 17, 2005
PubMed
Summary

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DNA sequencing of the ribosomal DNA ITS2 region effectively identified 16 Anopheles mosquito species in the Amazon Basin. This molecular tool aids in resolving taxonomic challenges for these disease-carrying insects.

Area of Science:

  • Entomology
  • Molecular Biology
  • Genetics

Background:

  • Anopheles mosquitoes, vectors of malaria, often present identification challenges due to morphological similarities within species complexes.
  • Accurate species identification is crucial for understanding disease transmission dynamics and implementing effective control strategies.

Purpose of the Study:

  • To assess the utility of ribosomal DNA (rDNA) internal transcribed spacer 2 (ITS2) sequences for differentiating Anopheles mosquito species from the Amazon Basin.
  • To evaluate the congruence between molecular data and existing morphological taxonomy.

Main Methods:

  • DNA was extracted from 16 Anopheles species collected in the Amazon Basin, Brazil.
  • The second internal transcribed spacer (ITS2) of ribosomal DNA was amplified and sequenced.

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  • Phylogenetic analyses, including maximum-likelihood and neighbor-joining methods, were performed on the ITS2 sequences.

    • Main Results:

    • ITS2 sequences varied in length (323–410 bp) and GC content (50.7–66.5%), with sequence identity ranging from 25% to 99% between species.
    • Phylogenetic analysis clearly separated the Anopheles subgenera Anopheles and Nyssorhynchus.
    • The ITS2-based neighbor-joining tree for the Nyssorhynchus subgenus was consistent with established morphological classifications.

    Conclusions:

    • Ribosomal DNA ITS2 sequencing is a reliable and effective method for the precise identification of Anopheles species in the Amazon.
    • This molecular approach can help resolve taxonomic ambiguities and improve our understanding of Anopheles diversity and their role in disease transmission.