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Drosophila damage-specific DNA-binding protein 1 (D-DDB1) is controlled by the DRE/DREF system
Kei-ichi Takata1, Gen Ishikawa, Fumiko Hirose
1Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda-shi, Chiba-ken 278-8510, Japan.
Nucleic Acids Research
|August 31, 2002
Summary
Researchers cloned the Drosophila gene d-ddb1, a homolog of human DNA repair protein DDB1. The study reveals D-DDB1
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- The human damage-specific DNA-binding protein (DDB) complex, including the p127 subunit, is known to recognize DNA lesions like (6-4) photoproducts.
- Understanding homologs in other organisms can elucidate conserved DNA repair mechanisms and functions.
Purpose of the Study:
- To clone and characterize the Drosophila homolog of the human DDB p127 subunit.
- To investigate the function of the Drosophila D-DDB1 protein in DNA repair, cell proliferation, and development.
Main Methods:
- Gene cloning and characterization.
- RNA interference (RNAi) to generate d-ddb1 knockout cells.
- UV and methyl methanesulfonate (MMS) treatment to assess DNA repair capacity.
- Analysis of d-ddb1 transcript levels and protein localization during development and in response to DNA damage.
Main Results:
- The Drosophila gene d-ddb1, encoding a homolog of human DDB p127, was successfully cloned.
- d-ddb1 knockout cells exhibited sensitivity to UV radiation, indicating a role in DNA repair.
- d-ddb1 transcript levels increased following UV or MMS treatment.
- d-ddb1 expression is regulated by the DRE/DREF system, typically associated with proliferation genes.
- d-ddb1 transcription varied significantly during development, with high levels in unfertilized eggs.
- D-DDB1 protein localization shifted between cellular compartments, notably during spermatogenesis and in response to UV irradiation.
Conclusions:
- D-DDB1 functions as a DNA repair factor in Drosophila.
- D-DDB1's regulation by the DRE/DREF system suggests a link to cell proliferation.
- The developmental expression pattern indicates D-DDB1 has roles beyond direct DNA damage response.
- D-DDB1 is involved in both DNA repair and cellular processes like proliferation and development.