Gene structure and expression of the rat cytochrome P450IIC13, a polymorphic, male-specific cytochrome in the P450IIC subfamily

Biochemistry. 1991 Nov 12;30(45):10844-9. doi: 10.1021/bi00109a006.


The male-specific CYP2C13 gene has been isolated from two independent rat genomic libraries. This gene spans more than 50 kb and contains eight introns which are subject to the GT-AG rule. Two allelic forms of the CYP2C13 gene were identified. Determination of the exonic sequences revealed that one of them encodes cytochrome P450(+g) and the other encodes cytochrome P450(-g). Using allele-specific restriction enzyme sites, a good correlation between the genotype and the phenotype of CYP2C13 was shown. Nucleotide substitutions between the (+g) and the (-g) genes exist not only in the exons but also in the introns and the 5'-flanking region. Although five nucleotide differences were identified within 287 base pairs of the (+g) and (-g) 5'-flanking regions, the transcription initiation sites were identical. In addition to a canonical TATA box located 31 base pairs upstream of the start site of transcription, putative binding sites for the liver-enriched and liver-specific transcription factors HNF1/LF-B1/APF, HNF3, HNF4/AF-1, C/EBP, LAP, and eH-TF/TGT3 and the ubiquitous factors NF-1 and OTF-1 were identified.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bacteriophage lambda / genetics
  • Base Sequence
  • Cloning, Molecular
  • Cytochrome P-450 Enzyme System / genetics*
  • DNA / genetics
  • DNA / isolation & purification
  • Escherichia coli / genetics
  • Exons
  • Genes
  • Genomic Library
  • Introns
  • Liver / enzymology*
  • Male
  • Molecular Sequence Data
  • Oligodeoxyribonucleotides
  • Oligonucleotide Probes
  • Rats
  • Rats, Inbred F344
  • Rats, Inbred Strains
  • Restriction Mapping
  • Sex Characteristics


  • Oligodeoxyribonucleotides
  • Oligonucleotide Probes
  • DNA
  • Cytochrome P-450 Enzyme System

Associated data

  • GENBANK/J05352