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[Analysis of the frequency of allelic exclusion of immunoglobulin light chain genes and molecular characteristics of immunoglobulins secreted by hybridomas with expression of both allelic genes].

The investigation of 750 B-lymphocyte hybridoma clones obtained by fusion of mouse myeloma and newborn heterozygous Igk-la/Igk-1b rat splenocytes has revealed that 9,8% of Ig kappa-chain genes are rearranged productively. Seventeen hybridomas secrete kappa-chains of both allelic variants. The analysis of IgM molecules of nine such clones demonstrated that in six cases only one L-chain allotype is present in IgM. Thus for the first time the high frequency of selective association of H and L chains was shown. Evidently this selectively may function as one of the allelic exclusion mechanisms at the Ig assembly stage.