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Detection of linkage disequilibrium in Trypanosoma brucei isolated from tsetse flies and characterized by RAPD analysis and isoenzymes

Published online by Cambridge University Press:  06 April 2009

J. R. Stevens  and
M. Tibayrenc
J. R. Stevens
Affiliation:
UMR CNRS/ORSTOM 9926: Génétique Moléculaire des Parasites et des Insectes Vecteurs, ORSTOM, 911 Avenue Agropolis, BP 5045, 34032, Montpellier, France
M. Tibayrenc
Affiliation:
UMR CNRS/ORSTOM 9926: Génétique Moléculaire des Parasites et des Insectes Vecteurs, ORSTOM, 911 Avenue Agropolis, BP 5045, 34032, Montpellier, France
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Summary

This study analyses the different populations of Trypanosoma brucei spp. which may coexist within the midgut of wild tsetse flies (Stevens et al. 1994). Cloned trypanosome populations characterized by multilocus enzyme electrophoresis (MLEE) were further analysed by the random amplified polymorphic DNA (RAPD) technique, allowing detection of genetic variation at a finer level than that possible by MLEE. Genetic distance matrices derived from the results of each of the two biochemical methods were calculated and compared using a computer program based on the method of Mantel (1967). The observed correlation was used to investigate the degree of linkage disequilibrium (LD) in the data, association between unrelated polymorphic markers providing a measure of the departure from panmixia. The potential of each biochemical method to detect linkage was evaluated by an extended Mantel test. The MLEE/RAPD correlation test evidenced significant LD within the population, suggesting a predominantly clonal method of reproduction for these West African trypanosomes. Analysis of RAPD data by the extended Mantel test also showed significant LD, while the results with MLEE data were less conclusive, providing an indication of the relative potential of the two techniques to detect fine genetic variation.

Keywords

Trypanosoma bruceirandom amplified polymorphic DNAisoenzymeslinkage disequilibriumpopulation structure
Type
Research Article
Information
Parasitology , Volume 110 , Issue 2 , February 1995 , pp. 181 - 186
Copyright
Copyright © Cambridge University Press 1995

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