Replication Protein A (RPA1a) Is Required for Meiotic and Somatic DNA Repair but Is Dispensable for DNA Replication and Homologous Recombination in Rice

Publication Type:Journal Article
Year of Publication:2009
Authors:Chang, Y, Gong, L, Yuan, W, Li, X, Chen, G, Li, X, Zhang, Q, Wu, C
Journal:Plant Physiology
Date Published:2009
ISBN Number:00320889
Keywords:Oryza, Oryza sativa

Replication protein A (RPA), a highly conserved single-stranded DNA-binding protein in eukaryotes, is a stable complex comprising three subunits termed RPA1, RPA2, and RPA3. RPA is required for multiple processes in DNA metabolism such as replication, repair, and homologous recombination in yeast (Saccharomyces cerevisiae) and human. Most eukaryotic organisms, including fungi, insects, and vertebrates, have only a single RPA gene that encodes each RPA subunit. Arabidopsis (Arabidopsis thaliana) and rice (Oryza sativa), however, possess multiple copies of an RPA gene. Rice has three paralogs each of RPA1 and RPA2, and one for RPA3. Previous studies have established their biochemical interactions in vitro and in vivo, but little is known about their exact function in rice. We examined the function of OsRPAla in rice using a T-DNA insertional mutant. The osrpala mutants had a normal phenotype during vegetative growth but were sterile at the reproductive stage. Cytological examination confirmed that no embryo sac formed in female meiocytes and that abnormal chromosomal fragmentation occurred in male meiocytes after anaphase I. Compared with wild type, the osrpala mutant showed no visible defects in mitosis and chromosome pairing and synapsis during meiosis. In addition, the osrpala mutant was hypersensitive to ultraviolet-C irradiation and the DNA-damaging agents mitomycin C and methyl methanesulfonate. Thus, our data suggest that OsRPAla plays an essential role in DNA repair but may not participate in, or at least is dispensable for, DNA replication and homologous recombination in rice.

Short Title:Plant Physiology
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