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The Journal of Immunology, Vol 154, Issue 6 2743-2752, Copyright © 1995 by American Association of Immunologists
ARTICLES |
H Ying, E Nakayama, WH Robinson and JR Parnes
Department of Medicine, Stanford University School of Medicine, CA 94305.
The complete sequence of the CD72 gene from the C57L mouse, including the 5' and 3' flanking sequences, is reported. The gene spans 6830 base pairs and includes nine exons surrounding eight introns. It does not have an obvious TATAA box, so it belongs to a group of genes with TATA- less promoters that are regulated during mammalian immunodifferentiation. cDNA sequence comparisons among CD72a, CD72b, and CD72c alleles have demonstrated two distinct seven amino acid insertion/deletions among these allelic variants. Based on our genomic sequence studies as well as PCR analyses, we found that different strains of mice can alternatively or exclusively use either of two AG sites surrounding the 21-bp insertion/deletions as 3' splice sites in an allele-specific manner. Other alternative splicing events, such as exon skipping, also contribute to CD72 polymorphism. In mouse splenic B cells there are allele-specific distributions of CD72 mRNAs that contain sequences from both exon 3 and exon 4, from either exon 3 or exon 4, or from neither exon 3 nor 4. It is unclear what the in vivo function might be of the proteins encoded by the mRNA forms lacking these exon sequences.
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