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Jenkins, M.C. et al.

Eimeria acervulina: DNA cloning and characterization of recombinant sporozoite and merozoite antigens.

Genes encoding antigens of Eimeria acervulina were cloned from cDNA expression libraries prepared from the sporozoite and merozoite stages in order to examine humoral and cellular immune responses to this protozoan parasite. Two clones expressing surface antigens were characterized by DNA hybridization studies to identify homologous genomic DNA fragments. The proteins they encode were identified by 125I-labeling, immunoblotting, immunofluorescence, and T-cell activation experiments. One, designated cSZ-1, encodes a 130-kDa beta-galactosidase fusion protein which represents a portion of a p240/p160 immunodominant sporozoite surface antigen. Immunofluorescence studies using anti-cSZ-1 sera and live or 1% paraformaldehyde-fixed E. acervulina sporozoites have confirmed this surface locale. Purified cSZ-1 fusion protein, which is not recognized by sera from E. acervulina-infected chickens, induced the activation of immune T lymphocytes in vitro. Another cDNA clone, designated cMZ-8, gives rise to a 150-kDa fusion protein and encodes a portion of a p250 immunodominant merozoite surface antigen. This was established by immunoblotting of 125I-labeled merozoite proteins with anti-cMZ-8 sera and immunofluorescence staining of live and 1% paraformaldehyde-fixed E. acervulina merozoites. Purified cMZ-8 is recognized by sera from E. acervulina-infected chickens and induces a significant activation of immune T lymphocytes in vitro.[1]

References

Eimeria acervulina: DNA cloning and characterization of recombinant sporozoite and merozoite antigens. Jenkins, M.C., Lillehoj, H.S., Dame, J.B. Exp. Parasitol. (1988) [Pubmed]

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