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Plasmodium falciparum: sequence diversity and antibody recognition of the Merozoite surface protein-2 (MSP-2) in Brazilian Amazonia
Authors:Tonon Angela Pedroso  Hoffmann Erika Hellena Esther  Silveira Lucimeire Antonelli da  Ribeiro Adálton Guimarães  Gonçalves Clara Rosa da Silva  Ribolla Paulo Eduardo Martins  Wunderlich Gerhard  Ferreira Marcelo Urbano
Institution:Departamento de Parasitologia, Instituto de Ciências Biomédicas da Universidade de S?o Paulo, Av. Prof. Lineu Prestes 1374, Cidade Universitária, 05508-900 S?o Paulo, Brazil.
Abstract:The merozoite surface protein-2 (MSP-2) of Plasmodium falciparum comprises repeats flanked by dimorphic domains defining the allelic families FC27 and IC1. Here, we examined sequence diversity at the msp-2 locus in Brazil and its impact on MSP-2 antibody recognition by local patients. Only 25 unique partial sequences of msp-2 were found in 61 isolates examined. The finding of identical msp-2 sequences in unrelated parasites, collected 6-13 years apart, suggests that no major directional selection is exerted by variant-specific immunity in this malaria-endemic area. To examine antibody cross-reactivity, recombinant polypeptides derived from locally prevalent and foreign MSP-2 variants were used in ELISA. Foreign IC1-type variants, such as 3D7 (currently tested for human vaccination), were less frequently recognized than FC27-type and local IC1-type variants. Antibodies discriminated between local and foreign IC1-type variants, but cross-recognized structurally different local IC1-type variants. The use of evolutionary models of MSP-2 is suggested to design vaccines that minimize differences between local parasites and vaccine antigens.
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