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The human C3a receptor (C3aR) mediates the activation of cells by the potent proinflammatory chemoattractant C3a, an anaphylatoxin, generated in the early phase of an inflammatory reaction by proteolytic cleavage of the complement component C3. To understand the molecular mechanisms that regulate C3aR gene expression, we initiated studies to determine its genomic and mRNA organization. We now report the following novel findings: (1) The C3aR is a single-copy gene as shown by Southern hybridization of human genomic DNA. (2) Using PCR amplification of DNA from monochromosomal somatic cell hybrid and radiation hybrid panels, the C3aR locus was mapped to chromosome 12p13. (3) Genomic DNA clones encompassing the C3aR locus were isolated from a human genomic DNA library and characterized by restriction mapping, Southern blotting, PCR analysis and DNA sequencing. Comparison of the genomic with the known cDNA sequences revealed a single 6-kb intron sequence located 1 1 bp upstream of the ATG initiation codon. The open reading frame and the complete 3' untranslated region are encoded on a single exon.
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