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. 1993 Aug 15;294(Pt 1):173–180. doi: 10.1042/bj2940173

Species-specific induction of cytochrome P-450 4A RNAs: PCR cloning of partial guinea-pig, human and mouse CYP4A cDNAs.

D R Bell 1, N J Plant 1, C G Rider 1, L Na 1, S Brown 1, I Ateitalla 1, S K Acharya 1, M H Davies 1, E Elias 1, N A Jenkins 1, et al.
PMCID: PMC1134581  PMID: 8363569

Abstract

PCR was used to demonstrate the presence of a conserved region and to clone novel members of the cytochrome P-450 4A gene family from guinea pig, human and mouse cDNAs. This strategy is based on the sequences at nucleotides 925-959 and at the haem binding domain (nucleotides 1381-1410) of the rat CYP4A1 gene. Murine Cyp4a clones showed high sequence identity with members of the rat gene family, but CYP4A clones from human and guinea pig were equally similar to the rat/mouse genes, suggesting that the rat/mouse line had undergone gene duplication events after divergence from human and guinea-pig lines. The mouse Cyp4a-12 clone was localized to chromosome 4 using interspecific backcross mapping, in a region of synteny with human chromosome 1. The assignment of the human CYP4A11 gene to chromosome 1 was confirmed by somatic cell hybridization. An RNAase protection assay was shown to discriminate between the murine Cyp4a-10 and Cyp4a-12 cDNAs. Treatment of mice with the potent peroxisome proliferator methylclofenapate (25 mg/kg) induced Cyp4a-10 RNA in liver, and to a lesser extent in kidney; there was no sex difference in this response. Cyp4a-12 RNA was present at high levels in male control liver and kidney samples, and was not induced by treatment with methylclofenapate. However, Cyp4a-12 RNA was present at low levels in control female liver and kidney RNA, and was greatly induced in both organs by methylclofenapate. Guinea pigs were exposed to methylclofenapate (50 mg/kg), but there was no significant induction of the guinea-pig CYP4A13 RNA. These findings are consistent with a species difference in response to peroxisome proliferators between the rat/mouse and the guinea pig.

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Selected References

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