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We have identified two novel splice variants of the metabotropic gamma-aminobutyric acid receptor (GABABR1), designated GABABR1c and GABABR1d, when screening a rat cerebellum cDNA library. GABABR1c has an amino acid sequence identical to GABABR1b, a member of GABABR1 isoforms, and an additional 93-bp insertion that generates an additional 31-amino-acid sequence in the fifth transmembrane region of GABABR1b. Thus, GABABR1c may have a structural variation in the second extracellular loop and fifth transmembrane region. GABABR1d also has an amino acid sequence identical to GABABR1b and an additional insertion of 566 bp that generates a divergent amino acid sequence in the carboxylterminal end. Reverse-transcription polymerase chain reaction analysis showed that in various rat tissues GABABR1c mRNA was ubiquitously expressed and GABABR1d mRNA in forebrain, cerebellum, eye, kidney, and urinary bladder. GABABR1 isoforms may function not only in the central nervous system but also in various peripheral tissues.
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