Analysis of the GAT B Repertoire

  • Michel Fougereau
  • José Rocca-Serra
  • Claudine Schiff
  • Cécile Tonnelle


Synthetic polypeptides(1) were first used as structurally well-defined models to understand the antigenicity of proteins, for which the exact nature of any given epitope was and still remains far from clear, except in a very few cases.(2,3) They subsequently proved decisive tools to discover genes which regulate the immune response in the guinea pig(4) and the mouse.(5) Among synthetic polypeptides, the (Glu60Ala30Tyr10) n random terpolymer, known as “GAT,” has been extensively used. This polymer, with molecular weights usually ranging between 30,000 and 100,000, is recognized by the immune system mostly through conformational epitopes,(6) and contains a high amount of α-helix. Genetic control of the immune response to GAT has been largely documented in the mouse, allowing definition of responder and nonresponder strains,(7) the later being of the H-2 P , H-2 q , and H-2 s haplotypes. As “nonresponder” (NR) strains could be forced to make anti-GAT antibodies provided the synthetic polypeptide was coupled to a carrier, such as methylated BSA,(8) the absence of response in NR strains was not due to a deficient repertoire at the B-cell level. In fact, a more detailed analysis of anti-GAT antibodies produced by both responder and “nonresponder” strains indicated that the repertoires looked very similar with respect to idiotypic specificities identified on GAT-specific antibodies.(9)


Light Chain Heavy Chain Synthetic Polypeptide Antibody Heavy Chain Allotypic Specificity 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Michel Fougereau
    • 1
  • José Rocca-Serra
    • 1
  • Claudine Schiff
    • 1
  • Cécile Tonnelle
    • 1
  1. 1.Centre d’Immunologie INSERM-CNRS de Marseille-LuminyFrance

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