The cDNA of the murine counterpart of the human TB2/DP1 (deleted in polyposis) gene, one of the six genes deleted in severe cases of familial adenomatous polyposis (FAP) disease, was isolated and analyzed. The murine transcript is 734-bp long and thereby considerably shorter than the 3100-bp human counterpart. This is due to a completely different 3' untranslated region in mouse which starts immediately after the translational stop codon, thereby deleting a RFLP (restriction-fragment length polymorphism) marker for this disease. The amino acid sequence, however, is 92% conserved between mouse and man. Triggering of murine mast cells by IgE plus antigen results in a decrease of TB2/DP1 mRNA up to 60% after 2 h implying a possible role of this gene in regulation of the allergic effector cell. Reverse transcription-polymerase chain reaction (RT-PCR) analysis shows an ubiquitous expression pattern in a number of mouse cell lines and tissues.
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