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Nucleic Acids Research, 2002, Vol. 30, No. 17 3795-3808
© 2002 Oxford University Press

Drosophila damage-specific DNA-binding protein 1 (D-DDB1) is controlled by the DRE/DREF system

Kei-ichi Takata, Gen Ishikawa, Fumiko Hirose1 and Kengo Sakaguchi*

Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda-shi, Chiba-ken 278-8510, Japan and 1 Aichi Cancer Center Research Instituite, Nagoya, Aichi 464-8681, Japan

*To whom correspondence should be addressed. Tel: +81 471 24 1501; Fax: +81 471 23 9767; Email: kengo{at}rs.noda.tus.ac.jp

We succeeded in cloning the gene, termed d-ddb1, for a Drosophila homolog of the p127 subunit of the human damage-specific DNA-binding protein, thought to recognize (6–4) photoproducts and related structures. In Drosophila, the gene product (D-DDB1) also appeared to play a role as a repair factor, d-ddb1 knockout Kc cells generated with a RNAi method being sensitive to UV. In addition, UV or methyl methanesulfonate treatment increased d-ddb1 transcripts. However, we found that the gene is controlled by the DRE/DREF system, which is generally responsible for activating the promoters of proliferation-related genes. Moreover, during Drosophila development, the transcription of d-ddb1 changed greatly, with the highest levels in unfertilized eggs, indicating that external injury to DNA is not essential to D-DDB1 function. Interestingly, as with UV irradiation-induced transfer of D-DDB1 to the nucleus from the cytoplasm, during spermatogenesis the protein transiently shifted from one cell compartment to the other. The results indicate that D-DDB1 not only contributes to the DNA repair system, but also has a role in cell proliferation and development.


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