PMID- 10585853 OWN - NLM STAT- MEDLINE DCOM- 20000317 LR - 20181113 IS - 0264-6021 (Print) IS - 1470-8728 (Electronic) IS - 0264-6021 (Linking) VI - 344 Pt 3 IP - Pt 3 DP - 1999 Dec 15 TI - Gene structure of mouse BIT/SHPS-1. PG - 667-75 AB - BIT/SHPS-1/SIRPalpha/P84 is a unique molecule with a high degree of homology with immune antigen recognition molecules (immunoglobulin, T-cell receptor and MHC), and is highly expressed in the brain. The extracellular region contains three immunoglobulin-like domains (V-type, C1-type and C1-type), and the intracellular region contains two signalling motifs that interact with SHP-2 protein tyrosine phosphatase. BIT-coated plates support cell-substrate adhesion and neurite extension of neurons, and BIT participates in neuronal signal transduction. Diversity of the V-type domain sequences of human BIT has been reported. In the present study we analysed the structure of the mouse BIT gene (Bit). The protein coding region consists of eight exons corresponding to a signal peptide, a V-type domain, a C1-type domain, a C1-type domain, a transmembrane region and three parts of one cytoplasmic region. The two signalling motifs are encoded in one exon. Four splicing forms of mouse BIT were revealed. We also found the sequence diversity in three mouse strains, namely BALB/c, 129/Sv and C57BL/6. The substitution patterns of amino acids and nucleotides indicate positive pressure to alter the amino acids in the V-type domain in evolution. Immunoblot analyses showed that mouse BIT and human BITalpha are predominantly expressed in the brain. On the bases of these findings we discuss the possibility that BIT contributes to the genetic individuality and diversity of the brain. FAU - Sano, S AU - Sano S AD - Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machida, Tokyo 194-8511, Japan. ssano@libra.ls.m-kagaku.co.jp FAU - Ohnishi, H AU - Ohnishi H FAU - Kubota, M AU - Kubota M LA - eng SI - GENBANK/AB018194 SI - GENBANK/AB023430 SI - GENBANK/AB024500 SI - GENBANK/AB024501 SI - GENBANK/AB024502 SI - GENBANK/AB024503 SI - GENBANK/AB024504 SI - GENBANK/AB024505 SI - GENBANK/AB024506 SI - GENBANK/AB024507 PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - England TA - Biochem J JT - The Biochemical journal JID - 2984726R RN - 0 (Antigens, Differentiation) RN - 0 (DNA, Complementary) RN - 0 (Membrane Glycoproteins) RN - 0 (Neural Cell Adhesion Molecule L1) RN - 0 (Neural Cell Adhesion Molecules) RN - 0 (Receptors, Immunologic) SB - IM MH - Alternative Splicing/genetics MH - Amino Acid Sequence MH - Animals MH - *Antigens, Differentiation MH - Base Sequence MH - Blotting, Southern MH - Blotting, Western MH - Brain/metabolism MH - Cloning, Molecular MH - DNA, Complementary/genetics MH - Exons MH - Gene Expression Regulation MH - Humans MH - Introns MH - Membrane Glycoproteins/chemistry/*genetics MH - Mice MH - Mice, Inbred Strains MH - Molecular Sequence Data MH - *Neural Cell Adhesion Molecule L1 MH - Neural Cell Adhesion Molecules/chemistry/*genetics MH - *Receptors, Immunologic MH - Sequence Homology, Amino Acid MH - Sequence Homology, Nucleic Acid PMC - PMC1220688 EDAT- 1999/12/10 09:00 MHDA- 2000/03/25 09:00 CRDT- 1999/12/10 09:00 PHST- 1999/12/10 09:00 [pubmed] PHST- 2000/03/25 09:00 [medline] PHST- 1999/12/10 09:00 [entrez] PST - ppublish SO - Biochem J. 1999 Dec 15;344 Pt 3(Pt 3):667-75.