Extreme polymorphism in a vaccine antigen and risk of clinical malaria: implications for vaccine development.

Abstract:

:Vaccines directed against the blood stages of Plasmodium falciparum malaria are intended to prevent the parasite from invading and replicating within host cells. No blood-stage malaria vaccine has shown clinical efficacy in humans. Most malaria vaccine antigens are parasite surface proteins that have evolved extensive genetic diversity, and this diversity could allow malaria parasites to escape vaccine-induced immunity. We examined the extent and within-host dynamics of genetic diversity in the blood-stage malaria vaccine antigen apical membrane antigen-1 in a longitudinal study in Mali. Two hundred and fourteen unique apical membrane antigen-1 haplotypes were identified among 506 human infections, and amino acid changes near a putative invasion machinery binding site were strongly associated with the development of clinical symptoms, suggesting that these residues may be important to consider in designing polyvalent apical membrane antigen-1 vaccines and in assessing vaccine efficacy in field trials. This extreme diversity may pose a serious obstacle to an effective polyvalent recombinant subunit apical membrane antigen-1 vaccine.

journal_name

Sci Transl Med

authors

Takala SL,Coulibaly D,Thera MA,Batchelor AH,Cummings MP,Escalante AA,Ouattara A,Traoré K,Niangaly A,Djimdé AA,Doumbo OK,Plowe CV

doi

10.1126/scitranslmed.3000257

subject

Has Abstract

pub_date

2009-10-14 00:00:00

pages

2ra5

issue

2

eissn

1946-6234

issn

1946-6242

journal_volume

1

pub_type

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