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Retrotransposons and evolution in phlebotomines.

D R Booth1, P D Ready, D F Smith

  • 1Department of Entomology, Natural History Museum, London.

Parassitologia
|December 1, 1991
PubMed
Summary
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Researchers identified non-LTR retrotransposons in sand fly species using polymerase chain reaction. These findings relate to the F element of Drosophila melanogaster and have implications for taxonomy and genetic manipulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Entomology

Background:

  • Retrotransposons are mobile genetic elements that can influence genome evolution.
  • Non-LTR retrotransposons are a major class of these elements, found across diverse organisms.
  • Understanding retrotransposon diversity in disease vectors like sand flies is crucial for genetic studies.

Purpose of the Study:

  • To identify and characterize putative retrotransposons in several sand fly species.
  • To compare amplified gene segments with known retrotransposon sequences.
  • To assess the utility of PCR-based methods for retrotransposon discovery in these vectors.

Main Methods:

  • Polymerase chain reaction (PCR) was employed to amplify a segment of the reverse transcriptase (RT) gene.

Related Experiment Videos

  • Amino acid sequence comparisons were performed between amplified products and known RT genes.
  • Phylogenetic analysis was used to infer evolutionary relationships.

    • Main Results:

    • The amplified RT gene segments from Phlebotomus (Larroussius) perniciosus, P. (L.) perfiliewi, P. (Phlebotomus) papatasi, and Lutzomyia (Lutzomyia) longipalpis were identified.
    • Sequence comparisons indicated that these products are derived from non-LTR retrotransposons.
    • The identified retrotransposons showed relatedness to the F element of Drosophila melanogaster.

    Conclusions:

    • PCR is an effective method for detecting and studying non-LTR retrotransposons in sand flies.
    • The discovery of these elements contributes to the understanding of insect genome diversity.
    • These findings have potential applications in sand fly taxonomy and genetic manipulation strategies.