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Isolation and expression of cDNA encoding the murine homologues of CD1.

Balk S.P., Bleicher P.A., Terhorst C.

The cDNA encoding the murine CD1.1 and CD1.2 gene products were isolated and their complete nucleotide sequence was determined. The nucleotide sequence and genomic organization of these molecules were similar to human CD1. The sequences in the alpha 1-alpha 3 domains were almost identical to previously reported genomic clones from a different strain, indicating limited polymorphism among these molecules. The predicted amino acid sequence in the transmembrane region and in the cytoplasmic tail was identical for CD1.1 and CD1.2. The two cDNA were also homologous in the 5' untranslated region but diverged in the 3' untranslated region. In contrast to human CD1, which is expressed at high levels in thymus, the expression of CD1 message in murine thymus was not detected in either thymus leukemia Ag positive or negative strains. Cell expressing murine CD1.1 were generated after transfer of the CD1.1 cDNA into murine cell lines. Immunoprecipitation with a rat anti-mouse CD1.1 mAb showed that the transfected CD1 was expressed on the cell surface as a beta 2-microglobulin-linked heterodimer. These results demonstrate that the murine and human CD1 genes, although encoding homologous transmembrane glycoproteins, are expressed in distinct tissues and may serve different functions.

J. Immunol. 146:768-774(1991) [PubMed] [Europe PMC]

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