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Malaria Journal
Published in: Malaria Journal 1/2011

Open Access 01-12-2011 | Research

Molecular markers of antifolate resistance in Plasmodium falciparum isolates from Luanda, Angola

Authors: Bianca E Gama, Guilhermina AL Pereira-Carvalho, Florbela JI Lutucuta Kosi, Natália K Almeida de Oliveira, Filomeno Fortes, Philip J Rosenthal, Virgílio E do Rosário, Cláudio Tadeu Daniel-Ribeiro, Maria de Fátima Ferreira-da-Cruz

Published in: Malaria Journal | Issue 1/2011

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Abstract

Background

Plasmodium falciparum malaria remains a leading health problem in Africa and its control is seriously challenged by drug resistance. Although resistance to the sulphadoxine-pyrimethamine (SP) is widespread, this combination remains an important component of malaria control programmes as intermittent preventive therapy (IPT) for pregnant women and children. In Angola, resistance patterns have been poorly characterized, and IPT has been employed for pregnant women since 2006. The aim of this study was to assess the prevalence of key antifolate resistance mediating polymorphisms in the pfdhfr and pfdhps genes in P. falciparum samples from Angola.

Methods

Plasmodium falciparum samples collected in Luanda, in 2007, were genotyped by amplification and DNA forward and reverse sequencing of the pfdhfr and pfdhps genes.

Results

The most prevalent polymorphisms identified were pfdhfr 108N (100%), 51I (93%), 59R (57%) and pfdhps 437G (93%). Resistance-mediating polymorphisms in pfdhps less commonly observed in West Africa were also identified (540E in 10%, 581G in 7% of samples).

Conclusion

This study documents an important prevalence of 4 P. falciparum polymorphisms that predicts an antifolate resistance in Luanda. Further, some samples presented additional mutations associated to high-level resistance. These results suggest that the use of SP for IPT may no longer be warranted in Angola.
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Metadata
Title
Molecular markers of antifolate resistance in Plasmodium falciparum isolates from Luanda, Angola
Authors
Bianca E Gama
Guilhermina AL Pereira-Carvalho
Florbela JI Lutucuta Kosi
Natália K Almeida de Oliveira
Filomeno Fortes
Philip J Rosenthal
Virgílio E do Rosário
Cláudio Tadeu Daniel-Ribeiro
Maria de Fátima Ferreira-da-Cruz
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2011
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/1475-2875-10-248

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