title: Photorepair mutants of Arabidopsis.
abstract: UV radiation induces two major DNA damage products, the cyclobutane pyrimidine dimer (CPD) and, at a lower frequency, the pyrimidine (6-4) pyrimidinone dimer (6-4 product). Although Escherichia coli and Saccharomyes cerevisiae produce a CPD-specific photolyase that eliminates only this class of dimer, Arabidopsis thaliana, Drosphila melanogaster, Crotalus atrox, and Xenopus laevis have recently been shown to photoreactivate both CPDs and 6-4 products. We describe the isolation and characterization of two new classes of mutants of Arabidopsis, termed uvr2 and uvr3, that are defective in the photoreactivation of CPDs and 6-4 products, respectively. We demonstrate that the CPD photolyase mutation is genetically linked to a DNA sequence encoding a type II (metazoan) CPD photolyase. In addition, we are able to generate plants in which only CPDs or 6-4 products are photoreactivated in the nuclear genome by exposing these mutants to UV light and then allowing them to repair one or the other class of dimers. This provides us with a unique opportunity to study the biological consequences of each of these two major UV-induced photoproducts in an intact living system.
authors.affiliation: Section of Plant Biology, University of California, Davis, CA 95616, USA.
authors.forename: C Z
authors.initials: CZ
authors.lastname: Jiang
authors.forename: J
authors.initials: J
authors.lastname: Yee
authors.forename: D L
authors.initials: DL
authors.lastname: Mitchell
authors.forename: A B
authors.initials: AB
authors.lastname: Britt
mesh_terms: D017360:Arabidopsis / Q000235:genetics*; D019755:Carbon-Carbon Lyases / Q000378:metabolism; D004260:DNA Repair; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D011740:Pyrimidine Dimers / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D011740:Pyrimidine Dimers; D019755:Carbon-Carbon Lyases; D004255:Deoxyribodipyrimidine Photo-Lyase