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Title: Frequencies of multiple IgL chain gene rearrangements in single normal or kappaL chain-deficient B lineage cells. Author: Yamagami T, ten Boekel E, Andersson J, Rolink A, Melchers F. Journal: Immunity; 1999 Sep; 11(3):317-27. PubMed ID: 10514010. Abstract: PCR analyses of the kappaL chain locus in single B-lineage cells of wild-type, Ckappa-, or JCkappa-deficient homozygous or heterozygous mice often detect multiple in- and out-of-frame rearrangements at the kappaL and lambdaL loci. They are most frequent in small pre-BII cells and equally so in wild-type and kappaL chain-deficient cells. Hence, kappaL chain production appears not to inhibit secondary rearrangements. Around 20% of all small preBII cells express IgL chains in their cytoplasm. Cells with a first productive rearrangement on one allele are favored to enter the immature B cell compartment. Thus, allelic exclusion might be secured by control of accessibility of IgL chain loci for rearrangement and by rapid selection of cells with a fitting over those with a nonfitting IgL chain.[Abstract] [Full Text] [Related] [New Search]