Frequencies of multiple IgL chain gene rearrangements in single normal or kappaL chain-deficient B lineage cells.
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.
Yamagami
T
T
Basel Institute for Immunology, Switzerland.
ten Boekel
E
E
Andersson
J
J
Rolink
A
A
Melchers
F
F
D000483:Alleles; D000818:Animals; D001402:B-Lymphocytes; D019070:Cell Lineage; D015328:Gene Rearrangement, B-Lymphocyte, Light Chain; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL
D007145:Immunoglobulin kappa-Chains