Structure and promoter analysis of the cytochrome P-450 aromatase gene of the teleost fish, medaka (Oryzias latipes)

Minoru Tanaka, Sachiko Fukada, Michiya Matsuyama, Yoshitaka Nagahama

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108 Citations (Scopus)


We isolated the structural gene encoding cytochrome P-450 aromatase (P-450arom), for the first time from a nonmammalian vertebrate, the medaka (a teleost fish, Oryzias latipes), using the rainbow trout P-450arom cDNA as a probe. The structure of the entire P-450arom gene, the nucleotide sequence of its 5' flanking region, and the transcriptional initiation sites were determined. The medaka P-450arom gene consists of nine exons, but spans only 2.6 kb, being much smaller than the human P-450arom gene (at least 70 kb), as a result of extremely small introns (medaka, 73-213 bp vs. human, 1.3-10 kbp). The splicing junctions are located at exactly the same positions as those found in the human P-450arom. The deduced amino acid sequence is 51-52% identical to those of mammals and chicken, and 75% identical to the rainbow trout amino acid sequence. Genomic Southern blots revealed the presence of a single medaka gene. Promoter analyses indicated two major transcription initiation sites 60 and 61 bp upstream from a putative initiation codon. The promoter region of medaka P-450arom gene also contains potential Ad4BP sites and estrogen responsive element (ERE) half-sites. These results suggest that the basic structural organization of P-450arom genes and the regulatory mechanisms of expression are well conserved throughout the vertebrates

Original languageEnglish
Pages (from-to)719-725
Number of pages7
JournalJournal of biochemistry
Issue number4
Publication statusPublished - Apr 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology


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