Genomic DNA sequence, expression, and chromosomal localization of the human B1 bradykinin receptor gene BDKRB1

We have cloned and sequenced the human B1 bradykinin receptor gene (BDKRB1), which contains an uninterrupted coding exon. A putative promoter was identified by linking various lengths of the 5'-flanking region of the B1 receptor gene coding sequence to a CAT reporter and assaying for CAT activity. Deletion analysis showed that a 300-bp fragment in the promoter region is sufficient to direct the synthesis of the reporter and that an enhancer-like element is present between -1842 and -812. A genomic Southern blot using the B1 cDNA revealed that the receptor is encoded by a single-copy gene. The gene is located on chromosome 14q32.1-q32.2, in close proximity to the B2 receptor gene. Northern blot analysis identified a 1.7- to 1.8-kb mature mRNA transcript of the B1 receptor gene in the kidney and pancreas. A widespread tissue distribution of the B1 gene expression was identified by RT-PCR-Southern blot analysis using specific oligonucleotide probes.