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Murine Ly-6-encoded molecules play an important role in the antigen-independent activation of lymphocytes. We have described the cloning of a cDNA encoding the protein component of an Ly-6 molecule. Hybridization studies indicated that this cDNA identified multiple DNA fragments on Southern blots. The banding pattern exhibits a restriction fragment length polymorphism from mice bearing either the Ly-6a or the Ly-6b allele. We have employed three independent chromosomal mapping techniques, somatic cell hybrids, in situ hybridization, and strain distribution pattern analysis of the restriction fragment length polymorphism of DNA from recombinant inbred lines, to ascertain the chromosomal origins of these bands. We report that all members of the Ly-6 multigene family are tightly linked on chromosome 15 and have been regionalized by in situ hybridization analysis to band 15E on the distal portion of this chromosome. Linkage analysis has indicated that the Ly-6 genes are located within 1 map unit of Env-54 (a retroviral envelope restriction fragment length polymorphism probe), 3 map units from ins-1, (insulin-related gene), and 4 map units from the protooncogene c-sis. The possible involvement of the Ly-6 lymphocyte activation and differentiation antigen genes in chromosome 15-related lymphoid malignancies is discussed.

Murine Ly-6 multigene family is located on chromosome 15.