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Control of the Transition to Flowering by chromatin modifications

Molecular Plant 2009年第4期2卷 554-564页

作者： Yuehui He Department of Biological Sciences National University of Singapore Singapore 117543 Temasek Life Sciences Laboratory Singapore 117604 Republic of Singapore

The timing of floral transition is critical to reproductive success in angiosperms and is genetically controlled by a network of flowering genes. In Arabidopsis, expression of certain flowering genes is regulated by various chromatin modifications, among which are two central regulators of flowering, namely FLOWERING LOCUS C （FLC） and FLOWERING LOCUS T（FT）. Recent studies have revealed that a number of chromatin-modifying components are involved in activation or repression of FLC expression. Activation of FLC expression is associated with various ＇active＇ chromatln modifications including acetylation of core histone tails, histone H3 lysine-4 （H3K4） methylation, H2B monoubiquitination, H3 lysine-36 （H3K36） di- and tri-methylation and deposition of the histone variant H2A.Z, whereas various ＇repressive＇ histone mod- ifications are associated with FLC repression, including histone deacetylation, H3K4 demethylation, histone H3 lysine-9 （H3K9） and H3 lysine-27 （H3K27） methylation, and histone arginine methylation. In addition, recent studies have revealed that Polycomb group gene-mediated transcriptional-silencing mechanism not only represses FLC expression, but also directly represses FTexpression. Regulation of FLC expression provides a paradigm for control of the expression of other developmental genes in plants through chromatin mechanisms.

关键词： chromatin modification flowering time FLC FT epigenetics.

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Molecular epigenetic mechanisms for the memory of temperature stresses in plants

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Journal of Genetics and Genomics 2022年第11期49卷 991-1001页

作者： Zhaoxu Gao Yue Zhou Yuehui He State Key Laboratory of Protein and Plant Gene Research School of Advanced Agricultural SciencesPeking-Tsinghua Center for Life SciencesPeking UniversityBeijing 100871China Peking University Institute of Advanced Agricultural Sciences WeifangShandong 261325China

The sessile plants encounter various stresses;some are prolonged,whereas some others are *** is crucial for plant growth and development,and plants often encounter adverse high temperature fluctuations(heat stresses)as well as prolonged cold exposure such as seasonal temperature drops in winter when grown in temperate *** plants can remember past temperature stresses to get adapted to adverse local temperature changes to ensure survival and/or reproductive ***,we summarize chromatin-based mechanisms underlying acquired thermotolerance or thermomemory in plants and review recent progresses on molecular epigenetic understanding of‘remembering of prolonged cold in winter’or vernalization,a process critical for various over-wintering plants to acquire competence to flower in the coming *** addition,perspectives on future study in temperature stress memories of economically-important crops are discussed.

关键词： Heat stress Thermomemory Cold memory Vernalization chromatin modification Epigenetics

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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

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Conserved RB functions in development and tumor suppression

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Protein & Cell 2011年第11期2卷 864-878页

作者： Gabriel M.Gordon Wei Du Ben May Department for Cancer Research University of ChicagoChicagoIL 60637USA

The variety of human cancers in which the retinoblastoma protein pRb is inactivated reflects both its broad importance for tumor suppression and its multitude of cellular *** evidence indicates that pRb contributes to a diversity of cellular functions,including cell proliferation,differentiation,cell death,and genome *** performs these diverse functions through the formation of large complexes that include E2F transcription factors and chromatin *** this review we will discuss some of the recent advances made in understanding the structure and function of pRb as they relate to tumor suppression,and highlight research using Drosophila melanogaster that reveals important,evolutionarily conserved functions of the RB family.

关键词： RB E2F Drosophila Rbf cell cycle chromatin modification

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ESR2–HDA6 complex negatively regulates auxin biosynthesis to delay callus initiation in Arabidopsis leaf explants during tissue culture

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Plant Communications 2024年第7期5卷 200-214页

作者： Kyounghee Lee Hobin Yoon Ok-Sun Park Jongbu Lim Sang-Gyu Kim Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Research Institute of Basic Sciences Seoul National UniversitySeoul 08826Korea Interdisciplinary Program in Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Department of Biological Sciences KAISTDaejeon 34141Korea

Plants exhibit an astonishing ability to regulate organ regeneration upon *** of leaf explants promotes the biosynthesis of indole-3-acetic acid(IAA),which is polar-transported to excised regions,where cell fate transition leads to root founder cell specification to induce de novo root *** regeneration capacity of plants has been utilized to develop in vitro tissue culture ***,we report that IAA accumulation near the wounded site of leaf explants is essential for callus formation on 2,4-dichlorophenoxyacetic acid(2,4-D)-rich callus-inducing medium(CIM).Notably,a high concentration of 2,4-D does not compensate for the action of IAA because of its limited efflux;rather,it lowers IAA biosynthesis via a negative feedback mechanism at an early stage of in vitro tissue culture,delaying callus *** auxin negative feedback loop in CIM-cultured leaf explants is mediated by an auxin-inducible APETALA2 transcription factor,ENHANCER OF SHOOT REGENERATION 2(ESR2),along with its interacting partner HISTONE DEACETYLASE 6(HDA6).The ESR2–HDA6 complex binds directly to,and removes the H3ac mark from,the YUCCA1(YUC1),YUC7,and YUC9 loci,consequently repressing auxin biosynthesis and inhibiting cell fate transition on 2,4-D-rich *** findings indicate that negative feedback regulation of auxin biosynthesis by ESR2 and HDA6 interferes with proper cell fate transition and callus initiation.

关键词： auxin biosynthesis negative feedback loop ESR2 HDA6 YUCCA chromatin modification

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Genetic and Epigenetic Understanding of the Seasonal Timing of Flowering

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Plant Communications 2020年第1期1卷 25-37页

作者： Yuehui He Tao Chen Xiaolin Zeng National Key Laboratory of Plant Molecular Genetics&Shanghai Center for Plant Stress Biology Chinese Academy of Sciences Center for Excellence in Molecular Plant SciencesShanghai 201602China

The developmental transition to flowering in many plants is timed by changing seasons,which enables plants to flower at a season that is favorable for seed *** plants grown at high latitudes perceive the seasonal cues of changing day length and/or winter cold(prolonged cold exposure),to regulate the expression of flowering-regulatory genes through the photoperiod pathway and/or vernalization pathway,and thus align flowering with a particular *** studies in the model flowering plant Arabidopsis thaliana have revealed that diverse transcription factors engage various chromatin modifiers to regulate several key flowering-regulatory genes including FLOWERING LOCUS C(FLC)and FLOWERING LOCUS T(FT)in response to seasonal ***,we summarize the current understanding of molecular and chromatin-regulatory or epigenetic mechanisms underlying the vernalization response and photoperiodic control of flowering in ***,the conservation and divergence of regulatory mechanisms for seasonal flowering in crops and other plants are briefly discussed.

关键词： vernalization photoperiodism flowering time FLOWERING LOCUS C FLOWERING LOCUS T chromatin modification

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