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The Journal of Immunology, Vol 147, Issue 5 1675-1686, Copyright © 1991 by American Association of Immunologists

ARTICLES

Many variable region genes are utilized in the antibody response of BALB/c mice to the influenza virus A/PR/8/34 hemagglutinin

AJ Caton, SE Stark, J Kavaler, LM Staudt, D Schwartz and W Gerhard
Wistar Institute of Anatomy and Biology, Philadelphia, PA 19104.

We have examined how many different H chain variable (VH) and kappa- chain variable (Vk) germ-line genes are used in the antibody response to the influenza virus A/PR/8/34 hemagglutinin (PR8 HA), and have assessed how the expression of individual VH and/or Vk genes contributes to the generation of specificity for the HA. A panel of 51 hybridoma antibodies that recognize two antigenic regions on the HA were compared for the sequence of their Ig H and L chain V regions. The hybridomas were obtained from 28 individual BALB/c mice that had been immunized with PR8 under a variety of primary and secondary response immunization protocols. The degree and pattern of sequence similarity suggests that 29 different VH genes drawn from seven different VH gene families, and 25 different Vk genes drawn from 12 different Vk gene families were used in this panel. Based on current estimates of the total numbers of VH and Vk genes in the mouse, this suggests that between 2.5 and 10% of the entire VH and Vk germ-line repertoires were used by these hybridomas. Despite this extensive diversity, some V genes were repetitively identified among these hybridomas, and were most often expressed in the context of specific VH/Vk combinations. Because antibodies that used identical VH/Vk combinations also usually displayed similar reactivity patterns with a panel of mutant viruses, this indicates that VH/Vk pairing can be important in establishing the specificity of antibodies for the HA.


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