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. 1988 Apr;85(8):2662–2666. doi: 10.1073/pnas.85.8.2662

Chromosomal organization of the cytochrome P450-2C gene family in the mouse: a locus associated with constitutive aryl hydrocarbon hydroxylase.

R R Meehan 1, R M Speed 1, J R Gosden 1, D Rout 1, J J Hutton 1, B A Taylor 1, J Hilkens 1, V Kroezen 1, J Hilgers 1, M Adesnik 1, et al.
PMCID: PMC280058  PMID: 2895926

Abstract

Cytochromes P-450 represent a superfamily of enzymes with a central role in the metabolism of drugs, chemical toxins, and carcinogens. We have used genetic analysis to establish the complexity and catalytic function of a recently identified constitutively expressed murine hepatic cytochrome P-450 encoded by P450-2C. Southern blotting analysis shows that there are at least seven or eight genes within this family in the mouse and rat and that DNA restriction fragment length variants between different mouse inbred strains are observed. Analysis of recombinant inbred strains derived from these parent strains shows (i) these genes are clustered within 1 centimorgan, (ii) this gene family does not correspond to any of the known cytochrome P-450 loci or map near any well-characterized genomic markers, and (iii) this gene family segregates to within 1-2 centimorgans of a locus controlling constitutive aryl hydrocarbon hydroxylase activity in mice. With use of Chinese hamster/mouse somatic cell hybrids, the P450-2C locus was assigned to a region of mouse chromosome 19 that appears to be syntenic with the previously mapped human P450C2C locus on human chromosome 10. By in situ hybridization to mitotic mouse chromosomes, we have localized this region to the tip of chromosome 19. These results are discussed in relation to the physiological roles of this P-450 family in foreign compound metabolism and steroid oxidations.

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