The murine B7-1 (mB7-1) molecule expressed on APCs delivers a costimulatory signal for T cell activation through its T cell counter-receptor CD28, resulting in T cell proliferation and IL-2 production. Signaling through the TCR in the absence of CD28 signaling results in T cell anergy. We have analyzed the genomic structure of mB7-1 and here describe the identification of a previously unrecognized sixth exon at the far 3' end of the locus, which encodes an alternative cytoplasmic domain. Reverse transcriptase-PCR amplification of mB7-1 transcripts demonstrates that exon 6 is functionally spliced to the transmembrane-encoding exon 4. Furthermore, using 5' rapid amplification of cDNA ends, we determined that the 5'-untranslated region extends over 1505 bp beyond the previously reported transcriptional start site. In addition, we report the chromosomal location of mB7-1 to chromosome 16, band B5.
CITATION STYLE
Borriello, F., Freeman, G. J., Edelhoff, S., Disteche, C. M., Nadler, L. M., & Sharpe, A. H. (1994). Characterization of the murine B7-1 genomic locus reveals an additional exon encoding an alternative cytoplasmic domain and a chromosomal location of chromosome 16, band B5. The Journal of Immunology, 153(11), 5038–5048. https://doi.org/10.4049/jimmunol.153.11.5038
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