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The Polycomb Complex PRC1:Composition and Function in Plants

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Journal of Genetics and Genomics 2013年第5期40卷 231-238页

作者： Anne molitor Wen-Hui Shen institut de biologie moléculaire des plantes du CNRS Université de Strasbourg12 rue du Général Zimmer67084 StrasbourgFrance institut J.-P.Bourgin UMR1318 INRA-AgroParisTechINRAroute de Saint Cyr78026 VersaillesFrance

Polycomb group（PcG） proteins are crucial epigenetic regulators conferring transcriptional memory to cell *** assemble into multi-protein complexes,e.g.,Polycomb Repressive Complex 1 and 2（PRC1,PRC2）,which are thought to act in a sequential manner to stably maintain gene ***2 induces histone H3 lysine 27（H3K27） trimethylation（H3K27me3）,which is subsequently read by PRCl that further catalyzes H2A monoubiquitination（H2Aub1）,creating a transcriptional silent chromatin ***2 components are conserved in plants and have been extensively characterized in *** contrast,PRCl composition and function are more diverged between animals and *** more recently,PRC1 existence in plants has been *** we review the aspects of plant specific and conserved PRC1 and highlight critical roles of PRC1 components in seed embryonic trait determinacy,shoot stem cell fate determinacy,and flower development in Arabidopsis.

关键词： Epigenetics Chromatin Histone modifications Polycomb PRC1 Arabidopsis development

The Multilayer’s Control of ARGONAUTE 1 Contents

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molecular Plant 2020年第1期13卷 1-3页

作者： Jean molinier institut de biologie moleculaire des plantes 12 Rue du General Zimmer67000 StrasbourgFrance

ARGONAUTE proteins(AGO)are key effectors of the RNA silencing pathways involved in the regulation of gene expression and in antiviral defense(Vaucheret,2008).Among the 10 AGO proteins present in Arabidopsis,AG01 is essential for plant development and defense response,participating in both microRNA(miRNA)-and small interfering RNA(siRNA)-mediated gene silencing(Vaucheret,2008).Given that AG01 depletion is lethal,only hypomorphic mutant plants are viable and display a large variety of developmental phenotypes(Vaucheret,2008).Importantly,the fine tuning of AG01 content is an important process orchestrated by several different pathways(Cho et al.,2016).It was recently described that the mode of action of AG01 is not only restricted to the posttranscriptional gene silencing pathway taking place in the ***,several nuclear AG01 functions have been identified(Bajczyk et al.,2019).Thus,the characterization of the different AG01 pools implies that specific subcellular pathways might trigger AGOI turnover and that complex regulatory processes might interplay to specifically fine tune AG01 content.

关键词： viable depletion restricted

TARGET： A Transient Transformation System for Genome-Wide Transcription Factor Target Discovery

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molecular Plant 2013年第3期6卷 978-980页

作者： Bastiaan O.R. Bargmann Amy Marshall-Colon Idan Efroni Sandrine Ruffel Kenneth D. Birnbaum Gloria M. Coruzzi Gabriel Krouk Center for Genomics and Systems Biology Department of Biology New York University New York NY 10003 USA Biochimie et Physiologie mol~culaire des plantes UMR 5004 CNRS/ INRA/SupAgro-M/UM2 Institut de Biologie Integrative des Plantes-Claude Grignon Montpellier France

dear Editor, determining the fundamental structure of gene regulatory networks （GRN） is a major challenge of systems biology. In particular, inferring GRN structure from comprehensive gene expression and transcription factor （TF）-promoter interaction data sets has become an increasingly sought-after aim in both fundamental and agronomical research in plant biology （Bonneau et al., 2007; Ruffel et al., 2010）.

关键词： TARGET Transient Transformation

A Non-canonical Transferred DNA Insertion at the BRI1 Locus in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2009年第4期51卷 367-373页

作者： Zhong Zhao Yan Zhu Mathieu Erhardt Ying Ruan Wen-Hui Shen Pre-National Laboratory of Crop Germplasm Innovation and Utilization Hunan Agricultural University Changsha 410128 China institut de biologie moléculaire des plantes du CNRS (UPR 2357) Université de Strasbourg (LIDS) 12 rue du Général Zimmer 67084 Strasbourg cedex France

Agrobacterium-mediated transformation is widely used in transgenic plant engineering and has been proven to be a powerful tool for insertional mutagenesis of the plant gsnome. The transferred DNA （T-DNA） from Agrobacterium is integrated into the plant genome through illegitimate recombination between the T-DNA and the plant DNA. Contrasting to the canonical insertion, here we report on a locus showing a complex mutation associated with T-DNA insertion at the BRI1 gene in Arabidopsis thaliana. We obtained a mutant line, named salads for its phenotype of dwarf stature and proliferating rosette. molecular characterization of this mutant revealed that in addition to T-DNA a non-T-DNA-Iocalized transposon from bacteria was inserted in the Arabidopsis genome and that a region of more than 11.5 kb of the Arabidopsis genome was deleted at the insertion site. The deleted region contains the braesinosteroid receptor gene BRI1 and the transcription factor gene WRKY13. Our finding reveals non-canonical T-DNA insertion, implicating horizontal gene transfer and cautioning the use of T-DNA as mutagen in transgenic research.

关键词： Agrobacterium Arabidopsis BRI1 gene flux transposon Tn5393 T-DNA transformation.

Dynamic Regulation of deLLA Protein Activity： SPINDLY and SECRET AGENT Unmasked!

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molecular Plant 2017年第6期10卷 785-787页

作者： Lucie Camut Jean-Michel Daviere Patrick Achard institut de biologie moleculaire des plantes CNRS Universite de Strasbourg 12 rue du General Zimmer 67084 Strasbourg Cedex France

Plants are sessile organisms that integrate growth responses to multiple endogenous and environmental signals. The deLLA family of transcription regulators, first identified as key repressors of gibberellin （GA） signaling, have emerged as a central node of integration, thus providing a mechanism for environmentally responsive growth regulation （Oh et al., 2014）.

关键词： Dynamic Regulation deLLA Protein Activity SECRET AGENT Unmasked

A Pivotal Role of deLLAs in Regulating Multiple Hormone Signals

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molecular Plant 2016年第1期9卷 10-20页

作者： Jean-Michel Daviere Patrick Achard institut de biologie moleculaire des plantes (IBMP) UPR2357 associe avec l'Universite de Strasbourg 12 rue General Zimmer 67084 Strasbourg Cedex France

Plant phenotypic plasticity is controlled by diverse hormone pathways, which integrate and convey infor- mation from multiple developmental and environmental signals. Moreover, in plants many processes such as growth, development, and defense are regulated in similar ways by multiple hormones. Among them, gibberellins （GAs） are phytohormones with pleiotropic actions, regulating various growth processes throughout the plant life cycle. Previous work has revealed extensive interplay between GAs and other hor- mones, but the molecular mechanism became apparent only recently. molecular and physiological studies have demonstrated that deLLA proteins, considered as master negative regulators of GA signaling, inte- grate multiple hormone signaling pathways through physical interactions with transcription factors or reg- ulatory proteins from different families. In this review, we summarize the latest progress in GA signaling and its direct crosstalk with the main phytohormone signaling, emphasizing the multifaceted role of deLLA proteins with key components of major hormone signaling pathways.

关键词： gibberellins deLLAs hormone crosstalk plant development phenotypic plasticity

Chromatin-remodeling factor OsINO80 is involved in regulation of gibberellin biosynthesis and is crucial for rice plant growth and development

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Journal of Integrative Plant Biology 2018年第2期60卷 144-159页

作者： Chao Li Yuhao Liu Wen-Hui Shen Yu Yu Aiwu Dong State Key Laboratory of Genetic Engineering Collaborative Innovation Center of Genetics and Development Institute of Plant Biology School of Life Sciences Fudan University Shanghai 200433 China institut de biologie moléculaire des plantes UPR2357 CNRSUniversité de Strasbourg 12 rue du General Zimmer 67084 Strasbourg CedexFrance

The phytohormone gibberellin（GA） plays essential roles in plant growth and development. Here,we report that OsINO80, a conserved ATP-dependent chromatin-remodeling factor in rice（Oryza sativa）, functions in both GA biosynthesis and diverse biological processes. OsINO80-knockdown mutants, derived from either T-DNA insertion or RNA interference, display typical GA-deficient phenotypes, including dwarfism, reduced cell length, late flowering, retarded seed germination and impaired reproductive development. Consistently, transcriptome analyses reveal that OsINO80 knockdown results in downregulation by more than two-fold of over 1,000 genes, including the GA biosynthesis genes CPS_1 and GA_3ox_2, and the dwarf phenotype of OsINO80-knockdown mutants can be rescued by the application of exogenous GA3. Chromatin immunoprecipitation（Ch IP） experiments show that OsINO80 directly binds to the chromatin of CPS1 and GA_3ox_2 loci. Biochemical assays establish that OsINO80 specially interacts with histone variant H_2A.Z and the H_2A.Z enrichments at CPS_1 and GA_3ox_2 are decreased in OsINO80-knockdown mutants. Thus, our study identified a rice chromatin-remodeling factor,OsINO80, and demonstrated that OsINO80 is involved in regulation of the GA biosynthesis pathway and plays critical functions for many aspects of rice plant growth and development.

关键词： GA Chromatin-remodeling factor OsINO80 is involved in regulation of gibberellin biosynthesis and is crucial for rice plant growth and development Figure

Epigenomic Modification and Epigenetic Regulation in Rice

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Journal of Genetics and Genomics 2012年第7期39卷 307-315页

作者： Yu Zhao Dao-Xiu Zhou National Key Laboratory for Crop Genetic Improvement Huazhong Agricultural University Wuhan 430070 China institut de biologie des plantes Universite' Paris sud Orsay 91405 France

Epigenomes including genome-wide histone modification and DNA methylation profiles are important for genome activity and fof defining gene expression patterns of plant development and responses to various environmental conditions. Rice is the most important crop plant and serves as a model for cereal genomics. Rice epigenomic landscape is emerging and the function of chromatin modification regulators in gene expression, transposon repression and plant development is being characterized. Epigenomic variation that gives rise to stable or transgenerational heritable epialleles related to variation of important agronomical traits or stress responses is being characterized in rice. Implication of epigenomic variation in rice heterosis is being exploited.

关键词： Epigenetics Epigenomics Ot3,za sativa

An update on histone lysine methylation in plants

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Progress in Natural Science:Materials International 2009年第4期19卷 407-413页

作者： Yu Yu a, Zhongyuan Bu a, Wen-Hui Shen b, Aiwu Dong a,a State Key Laboratory of Genetic Engineering, institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai 200433, China b institut de biologie moléculaire des plantes (IBMP), Laboratoire Propre du CNRS (UPR 2357) conventionné avec l’Université LouisPasteur Strasbourg, 67084 Strasbourg Cédex, France State Key Laboratory of Genetic Engineering Institute of Plant Biology School of Life Sciences Fudan University Shanghai 200433 China institut de biologie moléculaire des plantes (IBMP) Laboratoire Propre du CNRS (UPR 2357) conventionné avec l’Université Louis Pasteur Strasbourg 67084 Strasbourg Cédex France

Histone methylation plays crucial roles in epigenetic regulation. The SET domain proteins are now recognized as generally having methyltransferase activity targeted to specific lysine residues of histones. The enzymes and their specific histone lysine methylation have enormous impacts on the regulation of chromatin structure and function. In this review, we discuss recent advances made on histone lysine methylations and their diverse functions in plant growth and development.

关键词： Chromatin modification Histone Lysine methylation SET domain protein Plant