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Genetics, Vol 132, 799-811, Copyright © 1992
INVESTIGATIONS |
Germ Line Variable Regions That Match Hypermutated Sequences in Genes Encoding Murine Anti-Hapten Antibodies
V. David, N. L. Folk and N. Maizels
Present address: Department of Radiology, Brigham and Women's Hospital, 75 Francis Street, Boston, Massachusetts 02115.
We asked whether there are germ line immunoglobulin variable (V) segments that match sites of hypermutation in V regions encoding murine antibodies. Murine germ line DNA was probed with a panel of short deoxyoligonucleotides identical in sequence to segments of hypermutated V regions from hybridomas generated in the BALB/c response to the hapten 2-phenyloxazolone (Ox). Germ line sequences that match mutations in both heavy and k light chain V regions were identified, and clones of some of these germ line V segments were obtained. Comparison of these clones with hypermutated V regions revealed regions of identity ranging in size from 7 to over 50 nucleotides. In an effort to separate the effects of antigen selection from the mutagenic process, we also searched for matches to a panel of silent mutations in V(H) regions from germinal center B cells. Fourteen silent mutations occur among a collection of 36 hypermutated V(H) regions from two separate germinal centers of C57BL/6 mice stimulated with the hapten 4-hydroxy-3-nitrophenyl. Matches to nine of these silent mutations can be found among published sequences of C57BL/6 V(H) regions of the J558 family. Taken together, these data are consistent with the possibility that a template-dependent mutational process, like gene conversion, may contribute to somatic hypermutation.
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