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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Characterization of a cDNA for rat P-450g, a highly polymorphic, male-specific cytochrome in the P-450IIC subfamily.

Cytochrome P-450g (IIC13) is a highly polymorphic, male-specific rat liver isozyme which is a member of the P-450IIC subfamily. A cDNA, c5126 (1737 bp), for P-450g was isolated from a lambda gt11 library synthesized from (+g) male rat liver mRNA. Sequence analysis of the clone, c5126, revealed an open reading frame of 1473 nucleotides, which encodes for a 490 amino acid polypeptide possessing the 30 NH2-terminal residues reported for cytochrome P-450 (M-3) (P-450g) [Matsumoto et al. (1986) J. Biochem. 100, 1359-1371]. A high degree of sequence similarity (greater than 70%) exists between c5126 and the published sequences of cDNAs for members of the IIC subfamily, while its sequence similarity to other subfamilies ( IA, IIB, and IIIA) was much lower (less than 55%). RNA blot analysis utilizing an oligonucleotide probe specific for P-450g revealed that P-450g mRNA was expressed in livers of male but not female Sprague-Dawley (CD) and ACI rats, indicating that the sex difference was regulated pretranslationally. Furthermore, expression of P-450g mRNA was age dependent in livers of male ACI rats (a homozygous, phenotypically high P-450g strain). However, the mRNA for P-450g was expressed equally in livers of outbred male CD rats representing either the high (+g) or the low (-g) phenotype and of inbred ACI rats (+g) representing the high phenotype, indicating that the defect in (-g) rats does not reflect differences in expression of P-450g mRNA.[1]

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