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Related Experiment Videos

An introduction to antigenic variation in trypanosomes

G A Cross, A A Holder, G Allen

    The American Journal of Tropical Medicine and Hygiene
    |September 1, 1980
    PubMed
    Summary

    Salivarian trypanosomes evade immune responses through antigenic variation, switching cell surface variant surface glycoproteins (VSGs). Amino acid diversity in VSGs creates antigenic variation, aiding parasite survival.

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    Area of Science:

    • Parasitology
    • Immunology
    • Molecular Biology

    Background:

    • Salivarian trypanosomes evade host immune responses through a sophisticated mechanism.
    • Antigenic variation, mediated by the expression of diverse surface proteins, is central to this evasion strategy.

    Purpose of the Study:

    • To investigate the molecular mechanisms underlying antigenic variation in salivarian trypanosomes.
    • To understand the role of variant surface glycoproteins (VSGs) in immune evasion.

    Main Methods:

    • Analysis of amino acid sequences of VSGs from Trypanosoma brucei.
    • Biochemical characterization of VSG C-terminal glycosyl side chains.

    Main Results:

    • Trypanosomes exhibit extensive amino acid sequence diversity in VSGs, leading to antigenic diversity.
    • A conserved C-terminal glycosyl side chain is present on VSGs, suggesting a role in post-translational modification.

    Conclusions:

    • Antigenic variation via VSG expression is a key survival mechanism for trypanosomes.
    • The conserved glycosyl side chain likely facilitates proteolytic processing of VSGs, aiding in their display and immune evasion.

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