Abstract
Idiotope Ac38, a V region determinant of the lambda 1 chain-bearing, germ line encoded antibody B1-8, is expressed at high frequency (approximately 1/40) in lambda 1 chain-bearing B cells. Here, we describe the isolation of lambda-positive hybridomas from C57BL/6 mice which had been immunized with antibody Ac38, the antibody recognizing idiotope Ac38. In Northern blot analysis, mRNA isolated from 10 such hybridomas hybridizes with a cDNA probe from the VH gene expressed in the cell line B1-8. Amino acid sequence analysis of the VH regions of four of the hybridoma proteins reveals that they are all derived from related, though distinct, germ line VH genes. In one case the sequence data suggest that extensive somatic mutation has taken place. Only one of the four sequences derives from the same VH gene that is expressed in the cell line B1-8. Together with earlier evidence, the present data demonstrate that the Ac38 idiotope is a marker for at least five VH and three D region genes in the C57BL/6 germ line. This explains the high frequency at which this idiotope is expressed in the B cell population. In addition, our sequence determinations identify two VH genes in the C57BL/6 strain which are closely related (and possibly allelic) to two known BALB/c VH genes. One of these genes is the gene expressed in the BALB/c myeloma MOPC 104E.
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