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We have previously reported that the VH region amino acid sequence of a phosphocholine (PC)-binding hybridoma antibody of CBA/J origin, HP101 6G6 (6G6), differs extensively from the VH regions of other PC-binding antibodies. The sequence of 6G6 VH appears to be derived from a gene homologous to the BALB/c V11 gene, a member of the PC VH (T15 VH) gene family not normally used to encode PC-binding antibodies. The 6G6 VH sequence differs from the translated sequence of V11 by six amino acids, four of which occur at the same position in other members of this gene family. This coincidence led to the proposal that the 6G6 VH gene was derived by gene conversion involving three genes of the PC VH gene family. We report here the nucleic acid sequence of the rearranged VH gene of hybridoma 6G6. This sequence supports our previous suggestion of gene conversion by confirming those differences, relative to the BALB/c V11 gene sequence, that are encoded by other members of this gene family, and extends this correlation to include three silent base pair substitutions as well. In addition, 5' noncoding region sequence and Southern blot analysis using probes derived from the coding and 5' noncoding regions confirm that the 6G6 VH gene is likely to be derived from the V11 homologue in CBA/J mice, and suggest that all three genes believed to be involved in the generation of the 6G6 VH gene are present in the CBA/J genome, a prerequisite for their involvement in gene conversion.

Evidence for gene conversion among immunoglobulin heavy chain variable region genes.