PMID: 19141848Jan 15, 2009Paper

Genetic mapping of the duffy binding protein (DBP) ligand domain of Plasmodium vivax from unstable malaria region in the Middle East

The American Journal of Tropical Medicine and Hygiene
Laleh BabaeekhoNavid Dinparast Djadid

Abstract

The region II of Plasmodium vivax Duffy binding protein (PvDBP-II) contains the critical binding residues, which is a major target for development of naturally acquired immunity. Several studies showed sequence polymorphisms in PvDBP-II, which may inhibit antibodies recognition. Therefore, in this study the level of PvDBP-II polymorphism within and among P. vivax populations from re-emerged areas in north and endemic areas in south of Iran were evaluated by sequencing analysis in 75 isolates for the first time. Fourteen non-synonymous and one synonymous mutations were identified and none of the amino acid substitutions were directly involved in erythrocyte binding. Only 6 out of 14 detected mutations have been found among northern isolates, including D384G, R390H, N417K, L424I, W437R, and I503K. In total, two and nine different variants have been identified among northern and southern isolates, respectively. High association of the amino acid frequencies for codons 417, 437, and 503 were found among northern (85% for trio association and 100% for N417K with W437R), and southern (36% for trio association and 98% for N417K with W437R) samples. Polymorphisms at positions R308S, K371E, D384G, K386N, R390H, N417K, L424I, W437R, and ...Continue Reading

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