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Malaria Journal
Published in: Malaria Journal 1/2008

Open Access 01-12-2008 | Research

Heterogeneous distribution of Plasmodium falciparum drug resistance haplotypes in subsets of the host population

Authors: Sonja Schoepflin, Jutta Marfurt, Mary Goroti, Moses Baisor, Ivo Mueller, Ingrid Felger

Published in: Malaria Journal | Issue 1/2008

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Abstract

Background

The emergence of drug resistance is a major problem in malaria control. For mathematical modelling of the transmission and spread of drug resistance the determinant parameters need to be identified and measured. The underlying hypothesis is that mutations associated with drug resistance incur fitness costs to the parasite in absence of drug pressure. The distribution of drug resistance haplotypes in different subsets of the host population was investigated. In particular newly acquired haplotypes after radical cure were characterized and compared to haplotypes from persistent infections.

Methods

Mutations associated with antimalarial drug resistance were analysed in parasites from children, adults, and new infections occurring after treatment. Twenty-five known single nucleotide polymorphisms from four Plasmodium falciparum genes associated with drug resistance were genotyped by DNA chip technology.

Results

Haplotypes were found to differ between subsets of the host population. A seven-fold mutated haplotype was significantly reduced in adults compared to children and new infections, whereas parasites harbouring fewer mutations were more frequent in adults.

Conclusion

The reduced frequency of highly mutated parasites in chronic infections in adults is likely a result of fitness costs of drug resistance that increases with number of mutations and is responsible for reduced survival of mutant parasites.
Appendix
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Metadata
Title
Heterogeneous distribution of Plasmodium falciparum drug resistance haplotypes in subsets of the host population
Authors
Sonja Schoepflin
Jutta Marfurt
Mary Goroti
Moses Baisor
Ivo Mueller
Ingrid Felger
Publication date
01-12-2008
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2008
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/1475-2875-7-78

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