Critical comparison of molecular genotyping methods for detection of drug resistant Plasmodium falciparum

L. C. Ranford-Cartwright, K. L. Johnston, A. M. Abdel-Muhsin, B. K. Khan, H. A. Babiker

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We have critically evaluated 3 techniques for the detection of mutations conferring drug resistance of P1asmodium falciparum, using samples containing known numbers of well-characterized parasites and artificial mixtures of these parasites at known proportions. We compared the sensitivity and specificity of mutation-specific polymerase chain reaction (MS-PCR), polymerase chain reaction followed by restriction enzyme digestion at polymorphic sites (PCR/RFLP), and a dot-blot/probe hybridization technique, for detection of point mutations at nucleotide 323 of the P. falciparum dihydrofolate reductase gene (dhfr) that confer resistance to the antimalarial drug pyrimethamine. We have also investigated the benefits in terms of sensitivity and reproducibility of the incorporation of radiolabelled nucleotides into the PCR/RFLP assay. We found that MS-PCR was very sensitive-at least 10 parasites could be detected in a sample-but non-specific amplification resulted in erroneous typing of some samples. PCR/RFLP was less sensitive; 10 parasites per sample could not always be detected, but the technique was specific. The addition of radiolabelled nucleotides to the assay did not markedly improve the sensitivity but the results were easier to read and there was less subjectivity in scoring the results. The dot-blot/probe hybridization technique was specific and sensitive, with similar levels of specificity and sensitivity to PCR/RFLP. On balance, the dot-blot/probe hybridization technique seems best suited to large-scale epidemiological surveys of genes associated with antimalarial drug resistance.

Original languageEnglish
Pages (from-to)568-572
Number of pages5
JournalTransactions of the Royal Society of Tropical Medicine and Hygiene
Volume96
Issue number5
DOIs
Publication statusPublished - Sep 2002

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Plasmodium falciparum
Polymerase Chain Reaction
Restriction Fragment Length Polymorphisms
Pharmaceutical Preparations
Parasites
Nucleotides
Antimalarials
Drug Resistance
Mutation
Sensitivity and Specificity
Pyrimethamine
Tetrahydrofolate Dehydrogenase
Point Mutation
Genes
Digestion
Enzymes

Keywords

  • Dihydrofolate
  • Drug resistance
  • Genotyping techniques
  • Malaria
  • Plasmodium falciparum
  • Pyrimethamine
  • Reductase

ASJC Scopus subject areas

  • Parasitology
  • Medicine(all)

Cite this

Critical comparison of molecular genotyping methods for detection of drug resistant Plasmodium falciparum. / Ranford-Cartwright, L. C.; Johnston, K. L.; Abdel-Muhsin, A. M.; Khan, B. K.; Babiker, H. A.

In: Transactions of the Royal Society of Tropical Medicine and Hygiene, Vol. 96, No. 5, 09.2002, p. 568-572.

Research output: Contribution to journalArticle

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