title: DNA repair in higher plants; photoreactivation is the major DNA repair pathway in non-proliferating cells while excision repair (nucleotide excision repair and base excision repair) is active in proliferating cells.
abstract: We investigated expression patterns of DNA repair genes such as the CPD photolyase, UV-DDB1, CSB, PCNA, RPA32 and FEN-1 genes by northern hybridization analysis and in situ hybridization using a higher plant, rice (Oryza sativa L. cv. Nipponbare). We found that all the genes tested were expressed in tissues rich in proliferating cells, but only CPD photolyase was expressed in non-proliferating tissue such as the mature leaves and elongation zone of root. The removal of DNA damage, cyclobutane pyrimidine dimers and (6-4) photoproducts, in both mature leaves and the root apical meristem (RAM) was observed after UV irradiation under light. In the dark, DNA damage in mature leaves was not repaired efficiently, but that in the RAM was removed rapidly. Using a rice 22K custom oligo DNA microarray, we compared global gene expression patterns in the shoot apical meristem (SAM) and mature leaves. Most of the excision repair genes were more strongly expressed in SAM. These results suggested that photoreactivation is the major DNA repair pathway for the major UV-induced damage in non-proliferating cells, while both photoreactivation and excision repair are active in proliferating cells.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan.
authors.forename: Seisuke
authors.initials: S
authors.lastname: Kimura
authors.forename: Yasue
authors.initials: Y
authors.lastname: Tahira
authors.forename: Toyotaka
authors.initials: T
authors.lastname: Ishibashi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Mori
authors.forename: Toshio
authors.initials: T
authors.lastname: Mori
authors.forename: Junji
authors.initials: J
authors.lastname: Hashimoto
authors.forename: Kengo
authors.initials: K
authors.lastname: Sakaguchi
mesh_terms: D002455:Cell Division; D004249:DNA Damage; D004260:DNA Repair / Q000235:genetics*; D020869:Gene Expression Profiling; D017343:Genes, Plant / Q000235:genetics*; D018519:Meristem / Q000166:cytology / Q000235:genetics; D008969:Molecular Sequence Data; D020411:Oligonucleotide Array Sequence Analysis; D012275:Oryza / Q000166:cytology* / Q000235:genetics*; D018514:Plant Structures / Q000166:cytology / Q000235:genetics; D011740:Pyrimidine Dimers / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism
chemical_list: D011740:Pyrimidine Dimers; D012333:RNA, Messenger; D018749:RNA, Plant