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The Journal of Immunology, Vol 155, Issue 5 2445-2452, Copyright © 1995 by American Association of Immunologists

ARTICLES

Allelic differences in the VHOx-1 gene explain the absence of a B cell clonal dominance in the primary response of C57BL/6 mice to phthalate

DB Winter, ME Diamond, M Abu-hadid, S Falkenberg and RB Bankert
Department of Molecular Immunology, Rosewell Park Cancer Institute, Unit of the New York State Department of Health, Buffalo 14263, USA.

A highly conserved Id (CRIXmp-1) associated with the murine (BALB/c) humoral immune response to the hapten phthalate (Xmp) is conspicuously absent in C57BL/6 mice. The absence of this Id in C57BL/6 mice is shown here to be due to the absence of the appropriate VH gene (VHOx-1) usage in the Xmp response. To determine whether the failure to utilize this VH was due to an active suppression or to the lack of the requisite VH gene in the available repertoire, VHOx-1 gene-specific primers were used to amplify the germ-line VHOx-1 gene from genomic DNA from BALB/c and C57BL/6 mice. The germ-line coding sequence of the C57BL/6 allele of the VHOx-1 gene is 99% similar to the germ-line coding sequence of the BALB/c allele. Amplification of cDNA made from splenic RNA from C57BL/6 mice confirmed that this gene is expressed. There are four nucleotide differences that lead to three amino acid changes in the predicted protein sequence. Each change is either in or immediately adjacent to a complementarity-determining region (CDR). Two of these changes are unique to the C57BL/6 allele and are not shared with CRIXmp- 1-expressing strains. These two changes are predicted to alter the Xmp binding capabilities of the C57BL/6 allelic form of this VH gene, thereby explaining the absence of the Xmp-1 clonotype, which is dominant in the primary Xmp immune response of most other strains of mice.


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K. J. Seidl, J. A. Wilshire, J. D. MacKenzie, A. B. Kantor, L. A. Herzenberg, and L. A. Herzenberg
Predominant VH genes expressed in innate antibodies are associated with distinctive antigen-binding sites
PNAS, March 2, 1999; 96(5): 2262 - 2267.
[Abstract] [Full Text] [PDF]


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