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Related Experiment Videos

Variation and polymorphism in helminth parasites.

R M Maizels1, A Kurniawan-Atmadja

  • 1Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh E119 3JT, UK. r.maizels@ed.ac.uk

Parasitology
|March 8, 2003
PubMed
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Helminth parasites exhibit significant genetic diversity, challenging the view of them as invariant organisms. This intraspecific variation, particularly in antigens, may be crucial for parasite survival against host immunity.

Area of Science:

  • Parasitology
  • Evolutionary Biology
  • Immunology
  • Molecular Biology

Background:

  • Extensive polymorphism is predicted in helminth parasites due to evolutionary pressures.
  • Limited data exists on intraspecific variation, contrasting with detailed species delineation.
  • Laboratory strains are often treated as invariant, overlooking evolutionary dynamics.

Purpose of the Study:

  • To review and summarize intraspecific variation in major helminth parasites.
  • To focus on polymorphisms in protein-coding genes relevant to host-parasite interactions.
  • To investigate potential antigenic variation in filarial nematodes, specifically Brugia malayi.

Main Methods:

  • Review of existing literature on helminth intraspecific variation.

Related Experiment Videos

  • Analysis of biological, biochemical, immunological, and molecular data.
  • Focus on DNA sequence variants and protein polymorphisms in vaccine candidate antigens.

    • Main Results:

    • Significant intraspecific variability is indicated in proteins from the microfilarial stage of Brugia malayi.
    • Data suggests proteins involved in host-parasite interactions exhibit polymorphism.
    • Current information is insufficient to definitively confirm antigenic variation in filariasis.

    Conclusions:

    • Helminth parasites display considerable intraspecific variation, crucial for their evolutionary persistence.
    • Polymorphisms in antigens, especially from blood-borne stages, warrant further investigation.
    • Future research should explore drivers of this variability, including host immune response.