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Population sub-structuring among Trypanosoma evansi stocks.

Z K Njiru1, C C Constantine

  • 1School of Nursing, Murdoch University, Carleton Place, 15-17, Mandurah, WA, 6150, Australia. z.njiru@murdoch.edu.au

Parasitology Research
|June 26, 2007
PubMed
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This study analyzed Trypanosoma evansi from domesticated animals using genetic markers. Results reveal genetic sub-structuring within Trypanosoma evansi populations, indicating a predominantly clonal structure.

Area of Science:

  • Veterinary Parasitology
  • Population Genetics
  • Molecular Biology

Background:

  • Trypanosoma evansi is a significant pathogen affecting domesticated animals globally.
  • Understanding the population genetic structure of T. evansi is crucial for effective control strategies.
  • Previous studies have indicated genetic diversity within T. evansi, but further investigation is needed.

Purpose of the Study:

  • To investigate the population genetic structure of Trypanosoma evansi in domesticated animals.
  • To determine the extent of genetic diversity and sub-structuring within T. evansi stocks.
  • To assess the role of host species and geographical regions in shaping T. evansi population genetics.

Main Methods:

  • Analysis of 112 T. evansi stocks from camels, buffaloes, cattle, and horses.

Related Experiment Videos

  • Utilized tandemly repeated coding sequence (MORF2) and minisatellite markers (292, CRAM).
  • Employed population genetic analyses including Nei's genetic distance, index of association, and analysis of molecular variance (AMOVA).

    • Main Results:

    • Identified six alleles at MORF2, seven at 292, and 12 at CRAM loci.
    • Observed reduced genetic distance between buffalo and cattle stocks compared to camel stocks.
    • Significant population differentiation (Fst=0.28) and divergence (22.7%) were found between Kenyan regions; high genetic distances suggest sub-structuring, while low genotype numbers and index of association indicate limited recombination.

    Conclusions:

    • T. evansi exhibits genetic sub-structuring across different host animals and geographical regions.
    • The parasite displays a predominantly clonal population structure with limited evidence of recombination.
    • Findings highlight the importance of considering genetic diversity in developing control and eradication programs for T. evansi.