© 1994 Oxford University Press
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Interindividual difference in expression of human Ah receptor and related P450 genes
Department of Biochemistry, Saitama Cancer Center Research Institute 818 Komuro, Ina, Saitama 362, Japan
1Department of Epidemiology, Saitama Cancer Center Research Institute 818 Komuro, Ina, Saitama 362, Japan
The genomic clones of human aryl hydrocarbon receptor (Ahr) and Ahr nuclear translocator (Arnt) were isolated, and the structures of exon-intron junctions of these genes were partially determined. Based on the sequence information, a quantitative RT-PCR analysis was developed, and the expression of these genes was studied in various human tissues. mRNAs for Ahr and Arnt were widely expressed in human tissues and abundantly in lung. Individual difference in expression levels of Ahr and Arnt mRNA was observed in liver, lung and blood. In order to examine whether expression levels of Ahr and Arnt were associated with those of CYP1A1, we studied the expression of these mRNAs in blood among 20 healthy subjects, taking account of individuals' cigarette smoking habits. We found that the expression levels of CYP1Al appeared to associate with those of Ahr and Arnt mRNAs (P 
0.06), and also that the expression of Ahr and Arnt was influenced by cigarette smoking. The expression of human Ahr and Arnt is reported here for the first time, providing a quantitative RT-PCR analysis as a useful tool for further studies.
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