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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1980 Jun;77(6):3630–3634. doi: 10.1073/pnas.77.6.3630

Nucleotide sequence of immunoglobulin heavy chain joining segments between translocated VH and mu constant regions genes.

O Bernard, N M Gough
PMCID: PMC349671  PMID: 6251474

Abstract

To investigate the mechanism of recombination of immunoglobulin heavy chain variable and constant region genes, we have determined the nucleotide sequence of a large portion of the recombination region between an active C mu gene and its associated VH gene, isolated from an IgM-secreting mouse plasmacytoma, HPC76. By comparison with the sequence of the mu mRNA, we determined the exact boundaries of the intervening sequence between the VH76 and C mu genes. The rearranged VH76 gene encodes up to amino acid 116 without interruption, the 3' 39 nucleotides (the JH76 region) being derived from an embryonic JH segment (JH315) whose sequence was recently determined [Early, P., Huang, H., Davis, M., Calame, K. & Hood, L. (1980) Cell 195, 981-992]. The active JH76 does not use the first two codons of the embryonic JH315 from which it is derived. This indicates that V-J recombination is important in generating diversity within the third hypervariable region of heavy chains. We have identified another JH segment (JHA4), located 336 nucleotides 3' to the rearranged JH76 segment. This JH segment is expressed in the heavy chains of anti-levan myeloma proteins, which have truncated third hypervariable regions. We propose that the nucleotide sequence 5' to JHA4 is important for generating V region genes with shortened third hypervariable regions.

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Selected References

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