title: The Protein Arginine Methylase 5 (PRMT5/SKB1) Gene Is Required for the Maintenance of Root Stem Cells in Response to DNA Damage.
abstract: Plant root stem cells and their surrounding microenvironment, namely the stem cell niche, are hypersensitive to DNA damage. However, the molecular mechanisms that help maintain the genome stability of root stem cells remain elusive. Here we show that the root stem cells in the skb1 (Shk1 kinase binding protein 1) mutant undergoes DNA damage-induced cell death, which is enhanced when combined with a lesion of the Ataxia-telangiectasia mutated (ATM) or the ATM/RAD3-related (ATR) genes, suggesting that the SKB1 plays a synergistically effect with ATM and ATR in DNA damage pathway. We also provide evidence that SKB1 is required for the maintenance of quiescent center (QC), a root stem cell niche, under DNA damage treatments. Furthermore, we report decreased and ectopic expression of SHORTROOT (SHR) in response to DNA damage in the skb1 root tips, while the expression of SCARECROW (SCR) remains unaffected. Our results uncover a new mechanism of plant root stem cell maintenance under DNA damage conditions that requires SKB1.
authors.affiliation: State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Qiuling
authors.initials: Q
authors.lastname: Li
authors.affiliation: State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Graduate University of the Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100039, China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Yue
authors.affiliation: State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; The State Key Laboratory of Plant Genomics, Center for Genome Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Yongbiao
authors.initials: Y
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Molecular and Developmental Biology, Center for Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: slbao@genetics.ac.cn.
authors.forename: Shilai
authors.initials: S
authors.lastname: Bao
mesh_terms: D017360:Arabidopsis / Q000166:cytology* / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D064007:Ataxia Telangiectasia Mutated Proteins / Q000378:metabolism; D016923:Cell Death / Q000235:genetics; D004249:DNA Damage; D059565:G2 Phase Cell Cycle Checkpoints / Q000235:genetics; D059566:M Phase Cell Cycle Checkpoints / Q000235:genetics; D018519:Meristem / Q000166:cytology; D009154:Mutation; D018517:Plant Roots / Q000166:cytology*; D011484:Protein-Arginine N-Methyltransferases / Q000235:genetics* / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*
chemical_list: C576589:ATM protein, Arabidopsis; D029681:Arabidopsis Proteins; C524490:PRMT5 protein, Arabidopsis; D011484:Protein-Arginine N-Methyltransferases; C576892:ATR protein, Arabidopsis; D064007:Ataxia Telangiectasia Mutated Proteins
keywords: Arabidopsis; DNA damage; QC maintenance; Root stem cells; SKB1/PRMT5