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The cytochrome P450 2C (CYP2C) gene locus was found to include a novel exon 1 sequence with high similarity to the canonical exon 1 of CYP2C18. Rapid amplification of cDNA ends (RACE) and PCR amplifications of human liver cDNA revealed the presence of several intergenic species containing the CYP2C18 exon 1-like sequence spliced to different combinations of exonic and intronic sequences from the CYP2C9 gene. One splice variant was found to have an open reading frame starting at the canonical translation initiation codon of the CYP2C18 exon 1-like sequence. Another variant consisted of the nine typical CYP2C9 exons spliced after the CYP2C18 exon 1-like sequence through a segment of CYP2C9 5' flanking sequences. Moreover, analysis of bacterial artificial chromosome (BAC) clones revealed that the CYP2C18 exon 1-like sequence was located in the intergenic region between the CYP2C19 and CYP2C9 genes. The finding that a solitary exon is spliced with sequences from a neighboring gene may be interpreted as representing a general evolutionary mechanism aimed at using the full expression potential of a cell's genomic informational content.

Intergenic Transcripts Containing a Novel Human Cytochrome P450 2C Exon 1 Spliced to Sequences from the CYP2C9 Gene