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The Journal of Immunology, 1999, 162: 911-919.
Copyright © 1999 by The American Association of Immunologists

A Role for RAD51 in the Generation of Immunoglobulin Gene Diversity in Rabbits1

Robert A. Barrington*, Michael Fasullo2,{dagger} and Katherine L. Knight3,*

Departments of * Microbiology and Immunology, and {dagger} Radiotherapy, Loyola University of Chicago, Maywood, IL 60153

Ig VDJ genes in rabbit somatically diversify by both hyperpointmutation and gene conversion. To elucidate the mechanism of gene conversion of IgH genes, we cloned a rabbit homologue of RAD51, a gene involved in gene conversion in Saccharomyces cerevisiae (yeast), and tested whether it could complement a yeast rad51 mutant deficient in recombination repair. We found that rabbit RAD51 partially complemented the defect in switching mating types by gene conversion as well as in DNA double-strand break repair after {gamma}-irradiation. Further, by Western blot analysis, we found that levels of Rad51 were higher in appendix-derived B lymphocytes of 6-wk-old rabbits, a time at which IgH genes diversify by somatic gene conversion. We suggest that Rad51 is involved in somatic gene conversion of rabbit Ig genes.




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