Hamid MMA, Mohammed SB, El Hassan IM. Genetic Diversity of Plasmodium falciparum Field Isolates in Central Sudan Inferred by PCR Genotyping of Merozoite Surface Protein 1 and 2.
NORTH AMERICAN JOURNAL OF MEDICAL SCIENCES 2013;
5:95-101. [PMID:
23641369 PMCID:
PMC3624726 DOI:
10.4103/1947-2714.107524]
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Abstract
BACKGROUND
Characterization of Plasmodium falciparum diversity is commonly achieved by amplification of the polymorphic regions of the merozoite surface proteins 1 (MSP1) and 2 (MSP2) genes.
AIMS
The present study aimed to determine the allelic variants distribution of MSP1 and MSP2 and multiplicity of infection in P. falciparum field isolates from Kosti, central Sudan, an area characterized by seasonal malaria transmission.
MATERIALS AND METHODS
Total 121 samples (N = 121) were collected during a cross-sectional survey between March and April 2003. DNA was extracted and MSP1 and MSP2 polymorphic loci were genotyped.
RESULTS
The total number of alleles identified in MSP1 block 2 was 11, while 16 alleles were observed in MSP2 block 3. In MSP1, RO33 was found to be the predominant allelic type, carried alone or in combination with MAD20 and K1 types, whereas FC27 family was the most prevalent in MSP2. Sixty two percent of isolates had multiple genotypes and the overall mean multiplicity of infection was 1.93 (CI 95% 1.66-2.20). Age correlated with parasite density (P = 0.017). In addition, a positive correlation was observed between parasite densities and the number of alleles (P = 0.022).
CONCLUSION
Genetic diversity in P. falciparum field isolates in central Sudan was high and consisted of multiple clones.
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