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Immunoglobulin lambda gene rearrangement can precede kappa gene rearrangement
1Department of Microbiology and Immunology, University of California, San Francisco 94143-0414.
Developmental Immunology
|January 1, 1990
Summary
B lymphocyte differentiation involves immunoglobulin gene rearrangement. This study supports the stochastic theory, showing lambda-chain gene generation occurs independently of kappa locus status in mouse pre-B cells.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- B lymphocyte differentiation generates immunoglobulin genes through segment joining.
- Mouse pre-B cells have a functional heavy-chain gene but lack a light-chain gene.
- Two light-chain loci, kappa and lambda, exist, with kappa loci rarely in germ-line configuration when lambda genes are rearranged.
Purpose of the Study:
- To investigate the mechanism of light-chain immunoglobulin gene rearrangement in B lymphocytes.
- To differentiate between the ordered rearrangement theory and the stochastic theory of immunoglobulin gene rearrangement.
Main Methods:
- Analysis of lambda-chain gene generation in mouse pre-B cells.
- Assessment of kappa locus germ-line arrangement status in relation to lambda rearrangement.
Main Results:
- Lambda-chain genes are generated irrespective of whether the kappa locus retains its germ-line arrangement.
- This finding contradicts the ordered rearrangement theory, which predicts kappa rearrangement failure before lambda rearrangement.
Conclusions:
- The results strongly support the stochastic theory of immunoglobulin gene rearrangement.
- Lambda-chain gene rearrangement occurs at a slower intrinsic rate than kappa-chain gene rearrangement.