Organization of the CYP1A cluster on human chromosome 15: implications for gene regulation

Pharmacogenetics. 2001 Feb;11(1):1-6. doi: 10.1097/00008571-200102000-00001.


The sequence and organization of the CYP1A cluster on human chromosome 15 was determined. A human genomic clone from a BAC library, containing both CYP1A1 and CYP1A2 genes, was isolated and sequenced. The results of Southern blot analysis using human genomic DNA were compatible with the structure of the BAC clone. The CYP1A1 and CYP1A2 genes are separated by a 23 kb segment that contains no other open reading frames. The CYP1A1 and CYP1A2 genes are in opposite orientation, revealing that the 5' flanking region is in common between the two genes. Analysis of the sequence obtained revealed the presence of xenobiotic response elements (XREs) previously reported for CYP1A1 and CYP1A2 and several additional consensus sequences for putative XREs. The presence of all the XREs upstream of both genes suggest that some of the regulatory elements known to control CYP1A1 gene expression, could also control CYP1A2 gene expression.

MeSH terms

  • Chromosomes, Human, Pair 15 / genetics*
  • Cytochrome P-450 CYP1A1 / biosynthesis
  • Cytochrome P-450 CYP1A1 / genetics*
  • Cytochrome P-450 CYP1A2 / biosynthesis
  • Cytochrome P-450 CYP1A2 / genetics*
  • Gene Expression Regulation*
  • Gene Order*
  • Genetic Markers
  • Humans
  • Molecular Sequence Data
  • Multigene Family*
  • Restriction Mapping


  • Genetic Markers
  • Cytochrome P-450 CYP1A1
  • Cytochrome P-450 CYP1A2

Associated data

  • GENBANK/AF253322