Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Analysis of Two Promoters that Control the Expression of the GTP cyclohydrolase I Gene in Drosophila melanogaster

  • Byun, Jaegoo (Graduate School of Biotechnology, Kyung Hee University) ;
  • Yoon, Jaeseung (Graduate School of Biotechnology, Kyung Hee University) ;
  • Baek, Kwanghee (Graduate School of Biotechnology, Kyung Hee University)
  • Received : 2009.02.13
  • Accepted : 2009.03.05
  • Published : 2009.05.31
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Abstract

GTP cyclohydrolase I (GTPCH) is a key enzyme in the de novo synthesis of tetrahydrobiopterin. Previously, the Drosophila melanogaster GTPCH gene has been shown to be expressed from two different promoters (P1 and P2). In our study, the 5'-flanking DNA regions required for P1 and P2 promoter activities were characterized using transient expression assay. The DNA regions between -98 and +31, and between -73 and +35 are required for efficient P1 and P2 promoter activities, respectively. The regions between -98 and -56 and between -73 and -41 may contain critical elements required for the expression of GTPCH in Drosophila. By aligning the nucleotide sequences in the P1 and P2 promoter regions of the Drosophila melanogaster and Drosophila virilrs GTPCH genes, several conserved elements including palindromic sequences in the regions critical for P1 and P2 promoter activities were identified. Western blot analysis of transgenic flies transformed using P1 or P2 promoter-lacZ fusion plasmids further revealed that P1 promoter expression is restricted to the late pupae and adult developmental stages but that the P2 promoter driven expression of GTPCH is constitutive throughout fly development. In addition, X-gal staining of the embryos and imaginal discs of transgenic flies suggests that the P2 promoter is active from stage 13 of embryo and is generally active in most regions of the imaginal discs at the larval stages.

Keywords

Acknowledgement

Supported by : Kyung Hee University

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