| 2005 |
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| Are extensive T cell epitope polymorphisms in the Plasmodium falciparum
circumsporozoite antigen, a leading sporozoite vaccine candidate, selected by immune pressure? |
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| Kumkhaek, C., Phra-Ek, K., Renia, L., Singhasivanon, P., Looareesuwan, S., Hirunpetcharat, C.,
White, N. J., Brockman, A., Gruner, A. C., Lebrun, N., Alloueche, A., Nosten, F., Khusmith, S., and Snounou, G. |
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| Department of Microbiology and Immunology, Mahidol University, Bangkok,
Thailand |
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| Abstract: Protective cellular immune responses depend on MHC presentation of pathogen-derived
Ag fragments. MHC diversity renders this process sensitive to point mutations coding for altered amino acid sequence of the short target Ag-derived
peptides epitopes. Thus, in a given host, a pathogen with an altered epitope sequence will be more likely to escape detection and elimination by the
immune system. At a population level, selection by immune pressure will increase the likelihood of polymorphism in important pathogen antigenic
epitopes. This mechanism of immune evasion is found in viruses and other pathogens. The detection of polymorphic hot spots in an Ag is often taken as
a strong indication of its role in protective immunity. We provide evidence that polymorphisms in the T cell epitopes of a malaria vaccine candidate are
unlikely to have been selected by immune pressure in the human host |
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| Published in:J.Immunol. 175[6], 3935-3939. 15-9-2005. |
