title: Differential UVC-induced gadd45 gene expression in xeroderma pigmentosum cells.
abstract: Xeroderma pigmentosum C (XPC) is a DNA repair factor essential for global genome repair (GGR) in nucleotide excision repair (NER). In the present study we screened for factors regulated by XPC after DNA damage. Ultraviolet C (UVC) irradiation-induced stress response factors were analyzed by a cDNA microarray chip system in HeLa and XP4PA-SV xpc mutant cell lines. The principal component analysis (PCA) method was employed to identify groups of genes with similar expression patterns over time after UVC irradiation. The growth arrest and DNA damage-inducible gene gadd45, as well as a small group of other genes, was found to exhibit an inducible expression pattern after 30min of incubation in xpc mutants but not in HeLa cells. Subsequent studies showed that gadd45 gene expression post-UVC irradiation was also present in the GGR mutant cells xpa and xpd, but not in TCR mutant csb cells. This evidence indicates that gadd45 plays a regulatory role in GGR of NER.
authors.affiliation: Institute of Biomedical Engineering, College of Engineering, College of Medicine, National Cheng-Kung University, Tainan, Taiwan.
authors.forename: Hsien-Chang
authors.initials: HC
authors.lastname: Chang
authors.forename: Ju- He
authors.initials: J
authors.lastname: Tsai
authors.forename: Yueliang Leon
authors.initials: YL
authors.lastname: Guo
authors.forename: Yu-Hsin
authors.initials: YH
authors.lastname: Huang
authors.forename: Han-Ni
authors.initials: HN
authors.lastname: Tsai
authors.forename: Pei-Chien
authors.initials: PC
authors.lastname: Tsai
authors.forename: Wenya
authors.initials: W
authors.lastname: Huang
mesh_terms: D002460:Cell Line; D002470:Cell Survival / Q000528:radiation effects; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics*; D004307:Dose-Response Relationship, Radiation; D005347:Fibroblasts / Q000378:metabolism / Q000528:radiation effects; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000528:radiation effects*; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D025341:Principal Component Analysis; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics; D012867:Skin / Q000166:cytology; D014466:Ultraviolet Rays / Q000009:adverse effects; D000097642:GADD45 Proteins
chemical_list: D004268:DNA-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; D000097642:GADD45 Proteins; C086984:XPC protein, human