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. 1986 Apr 25;14(8):3311–3323. doi: 10.1093/nar/14.8.3311

Variation in the gene encoding a major merozoite surface antigen of the human malaria parasite Plasmodium falciparum.

J L Weber, W M Leininger, J A Lyon
PMCID: PMC339774  PMID: 3517809

Abstract

Plasmodium falciparum merozoites have a variable surface protein of about 195,000 molecular weight which may be involved in strain-specific immunity. We have cloned and sequenced a major portion of the gene encoding this antigen from the CAMP strain and have located sites of preferred mung bean nuclease cleavage around the gene. These sites depend on reaction conditions, but at 40% formamide and 2 units of mung bean nuclease per microgram DNA, the intact gene was excised from the chromosome. Comparison of the CAMP strain gene with the same gene from other strains of P. falciparum by matching available DNA sequences and by DNA hybridization revealed five regions of homology separated by divergent segments. Two of the variable regions encoded three amino acid repeats, predominantly Ser-Gly-Thr and Thr-Glu-Glu. Implications of these findings on the function of the antigen, and possible mechanisms for generation of variants are discussed.

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Selected References

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