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. 1991 Sep 15;88(18):7933–7937. doi: 10.1073/pnas.88.18.7933

Somatic mutation in constant regions of mouse lambda 1 light chains.

N Motoyama 1, H Okada 1, T Azuma 1
PMCID: PMC52419  PMID: 1910169

Abstract

To study the distribution of somatic mutation, we determined nucleotide sequences of rearranged lambda 1-chain genomic DNA from four hybridomas obtained from C57BL/6 mice that had been immunized with (4-hydroxy-3-nitrophenyl)acetyl-conjugated chicken gamma globulin. In total, 114 nucleotide substitutions were observed, with neither insertion nor deletion. Sixty-one mutations occurred in the variable-joining region genes (V lambda 1-J lambda 1) and 49 in joining-constant (J lambda 1-C lambda 1) introns. Although frequency decreased with distance from the V lambda 1-J lambda 1 coding region, somatic mutations occurred in the entire J lambda 1-C lambda 1 intron and even in the C lambda 1 region. We found four nucleotide substitutions in C lambda 1 genes, all of which were replacement mutations. Therefore, the mechanism responsible for somatic mutation is operative into the C lambda 1 exons. Nucleotide sequences of rearranged but inactive lambda 2-chain genes from two hybridomas were also examined and compared with those of lambda 1-chain genes. The clustering of replacement mutations in complementarity-determining regions in the inactive lambda 2-chain genes similar to the active lambda 1-chain genes suggested a mechanism that induces somatic mutation preferentially in this region even in the absence of antigenic selection.

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Selected References

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