Genetic control of the immune response to the radom linear terpolymer of L‐glutamic acid, L‐lysine and L‐leucine (GLleu) by complementing Ir genes

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Abstract
Three levels of humoral responsiveness (none, high or marginal) were noted following secondary immunization with the random linear terpolymer of L-glutamic acid, L-lysine and L-leucine (GLleu). These immune responses were under dual H-2-linked Ir gene control. Gene complementation was observed in appropriate F1 offspring between two nonresponder strains and in selected intra-I region recombinants derived from crossing over between nonresponder parental haplotypes. One of the Ir-GLleu genes, β, was localized within the I-A or I-B subregions. The other Ir-GLleu locus, termed a, was mapped in the I-C or S subregions. Differences in the strain distribution of immune responsiveness to GLleu and a related terpolymer GLphe (which is also under complementing Ir gene control) are primarily attributable to differences among the Ir-GLleu and Er-GLphe β alleles. A correlation exists between the presence of the Ir-GLleu α(+)allele and the gene coding for specificity Ia.7.