Distinct haplotypes of dhfr and dhps among Plasmodium falciparum isolates in an area of high level of sulfadoxine-pyrimethamine (SP) resistance in eastern Sudan

Salma Al-Saai, Amani Kheir, Abdel Muhsin A Abdel-Muhsin, Aisha Al-Ghazali, Davis Nwakanma, Göte Swedberg, Hamza A. Babiker

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Abstract

Typing of polymorphic microsatellites that are linked to drug resistance genes has shed light on the origin and pattern of spread of some anti-malarial drugs. Recent surveys revealed spread of a high-level pyrimethemine resistant lineage of Plasmodium falciparum, of Asian origin, across Africa. Here, we examined mutations in dihydrofolate reductase, dhfr [chromsosome 4], the dihydropteroate synthase, dhps [chromosome 8] associated with resistance to sulfadoxine-pyrimethamine (SP), and neighboring microsatellites among P. falciparum isolates in Asar village, eastern Sudan. This area lies at the fringes of malaria endemicity, where the remote P. falciparum parasites have some distinct genetic characteristics. Overall, 89% (84/94) of the examined isolates carried double mutations at dhfr (N51I and S108N), but the 59R and I164L mutations were not seen. Similarly, the majority, 43% (35/81) of the isolates carried double mutations at dhps (437G, 540E). Analysis of neighboring microsatellites revealed one major dhfr haplotype with mutations (51I, 108N) and one dhps haplotype with mutations (436S, 437G, 540E). These haplotypes differ from the major ones thought to drive resistance to SP across Africa. The resistant haplotypes of dhfr and dhps, in Asar, share some microsatellites with the wild genotypes suggesting that they were generated locally. Among isolates successfully examined, 40% shared identical haplotypes of the 2 loci, comprising a dominant resistant lineage. Undoubtedly, this lineage plays an important role in clinical failure to SP in this area.

Original languageEnglish
Pages (from-to)778-783
Number of pages6
JournalInfection, Genetics and Evolution
Volume9
Issue number5
DOIs
Publication statusPublished - Sep 2009

Fingerprint

sulfadoxine
pyrimethamine
Sudan
Plasmodium falciparum
Haplotypes
mutation
haplotypes
Microsatellite Repeats
Mutation
microsatellite repeats
Dihydropteroate Synthase
dihydrofolate reductase
drug resistance
Chromosomes, Human, Pair 8
Tetrahydrofolate Dehydrogenase
antimalarials
malaria
Antimalarials
Drug Resistance
Malaria

Keywords

  • dhfr
  • dhps haplotypes
  • Evolution
  • Plasmodium falciparum
  • Pyrimethamine
  • Sudan
  • Sulfadoxine resistance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Molecular Biology
  • Microbiology
  • Infectious Diseases
  • Microbiology (medical)

Cite this

Distinct haplotypes of dhfr and dhps among Plasmodium falciparum isolates in an area of high level of sulfadoxine-pyrimethamine (SP) resistance in eastern Sudan. / Al-Saai, Salma; Kheir, Amani; Abdel-Muhsin, Abdel Muhsin A; Al-Ghazali, Aisha; Nwakanma, Davis; Swedberg, Göte; Babiker, Hamza A.

In: Infection, Genetics and Evolution, Vol. 9, No. 5, 09.2009, p. 778-783.

Research output: Contribution to journalArticle

Al-Saai, Salma ; Kheir, Amani ; Abdel-Muhsin, Abdel Muhsin A ; Al-Ghazali, Aisha ; Nwakanma, Davis ; Swedberg, Göte ; Babiker, Hamza A. / Distinct haplotypes of dhfr and dhps among Plasmodium falciparum isolates in an area of high level of sulfadoxine-pyrimethamine (SP) resistance in eastern Sudan. In: Infection, Genetics and Evolution. 2009 ; Vol. 9, No. 5. pp. 778-783.
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AU - Abdel-Muhsin, Abdel Muhsin A

AU - Al-Ghazali, Aisha

AU - Nwakanma, Davis

AU - Swedberg, Göte

AU - Babiker, Hamza A.

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