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Published online 24 February 2004

Nucleic Acids Research, 2004, Vol. 32, No. 4 1318-1324
© 2004 Oxford University Press

Transcriptional regulation of the Drosophila catalase gene by the DRE/DREF system

So Young Park, Young-Shin Kim1, Dong-Jin Yang and Mi-Ae Yoo*

Department of Molecular Biology and 1 Research Institute of Genetic Engineering, Pusan National University, Busan 609-735, Korea

*To whom correspondence should be addressed. Tel: +82 51 510 2278; Fax: +82 51 513 9258; Email: mayoo{at}pusan.ac.kr

Reactive oxygen species (ROS) cause oxidative stress and aging. The catalase gene is a key component of the cellular antioxidant defense network. However, the molecular mechanisms that regulate catalase gene expression are poorly understood. In this study, we have identified a DNA replication-related element (DRE; 5'-TATCGATA) in the 5'-flanking region of the Drosophila catalase gene. Gel mobility shift assays revealed that a previously identified factor called DREF (DRE- binding factor) binds to the DRE sequence in the Drosophila catalase gene. We used site-directed mutagenesis and in vitro transient transfection assays to establish that expression of the catalase gene is regulated by DREF through the DRE site. To explore the role of DRE/DREF in vivo, we established transgenic flies carrying a catalase–lacZ fusion gene with or without mutation in the DRE. The ß-galactosidase expression patterns of these reporter transgenic lines demonstrated that the catalase gene is upregulated by DREF through the DRE sequence. In addition, we observed suppression of the ectopic DREF-induced rough eye phenotype by a catalase amorphic Catn1 allele, indicating that DREF activity is modulated by the intracellular redox state. These results indicate that the DRE/DREF system is a key regulator of catalase gene expression and provide evidence of cross-talk between the DRE/DREF system and the antioxidant defense system.


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