2024/04/18 更新

写真a

イケダ ヨウコ
池田 陽子
IKEDA Yoko
所属
資源植物科学研究所 准教授
職名
准教授
外部リンク

学位

  • 理学博士 ( 京都大学大学院 )

研究分野

  • ライフサイエンス / 遺伝学

  • ライフサイエンス / 植物分子、生理科学

学歴

  • 京都大学大学院   理学研究科   生物科学専攻

    2002年4月 - 2007年3月

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  • 岡山大学   Faculty of Agriculture   Department of Agricultural Sciences

    1998年4月 - 2002年3月

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経歴

  • 岡山大学資源植物科学研究所   准教授

    2018年12月 - 現在

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  • 岡山大学資源植物科学研究所   WTT助教

    2013年12月 - 2018年11月

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  • クレルモンオーベルニュ大学   日本学術振興会海外特別研究員

    2012年4月 - 2013年11月

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  • クレルモンオーベルニュ大学   博士研究員

    2011年11月 - 2012年3月

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  • 奈良先端科学技術大学院大学   GCOE特任助教

    2009年10月 - 2011年10月

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  • 奈良先端科学技術大学院大学   博士研究員

    2007年10月 - 2009年9月

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  • 国立遺伝学研究所   博士研究員

    2007年4月 - 2007年9月

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委員歴

  • 日本学術会議   連携会員  

    2023年10月 - 現在   

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  • 日本植物学会   第六期代議員  

    2022年6月   

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    団体区分:学協会

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  • 日本植物生理学会   広報委員  

    2022年3月 - 現在   

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    団体区分:学協会

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  • 日本植物学会   第五期代議員  

    2020年6月 - 現在   

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    団体区分:学協会

  • 日本植物学会   第五期代議員  

    2020年6月 - 2022年5月   

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    団体区分:学協会

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  • 日本植物学会   ダイバーシティ推進委員  

    2020年4月 - 現在   

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    団体区分:学協会

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論文

  • Reinvention of hermaphroditism via activation of a RADIALIS-like gene in hexaploid persimmon. 国際誌

    Kanae Masuda, Yoko Ikeda, Takakazu Matsuura, Taiji Kawakatsu, Ryutaro Tao, Yasutaka Kubo, Koichiro Ushijima, Isabelle M Henry, Takashi Akagi

    Nature plants   8 ( 3 )   217 - 224   2022年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In flowering plants, different lineages have independently transitioned from the ancestral hermaphroditic state into and out of various sexual systems1. Polyploidizations are often associated with this plasticity in sexual systems2,3. Persimmons (the genus Diospyros) have evolved dioecy via lineage-specific palaeoploidizations. More recently, hexaploid D. kaki has established monoecy and also exhibits reversions from male to hermaphrodite flowers in response to natural environmental signals (natural hermaphroditism, NH), or to artificial cytokinin treatment (artificial hermaphroditism, AH). We sought to identify the molecular pathways underlying these polyploid-specific reversions to hermaphroditism. Co-expression network analyses identified regulatory pathways specific to NH or AH transitions. Surprisingly, the two pathways appeared to be antagonistic, with abscisic acid and cytokinin signalling for NH and AH, respectively. Among the genes common to both pathways leading to hermaphroditic flowers, we identified a small-Myb RADIALIS-like gene, named DkRAD, which is specifically activated in hexaploid D. kaki. Consistently, ectopic overexpression of DkRAD in two model plants resulted in hypergrowth of the gynoecium. These results suggest that production of hermaphrodite flowers via polyploidization depends on DkRAD activation, which is not associated with a loss-of-function within the existing sex determination pathway, but rather represents a new path to (or reinvention of) hermaphroditism.

    DOI: 10.1038/s41477-022-01107-z

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  • Epigenetic regulation of ecotype-specific expression of the heat-activated transposon ONSEN. 国際誌

    Kosuke Nozawa, Seiji Masuda, Hidetoshi Saze, Yoko Ikeda, Takamasa Suzuki, Hiroki Takagi, Keisuke Tanaka, Naohiko Ohama, Xiaoying Niu, Atsushi Kato, Hidetaka Ito

    Frontiers in plant science   13   899105 - 899105   2022年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Transposable elements are present in a wide variety of organisms; however, our understanding of the diversity of mechanisms involved in their activation is incomplete. In this study, we analyzed the transcriptional activation of the ONSEN retrotransposon, which is activated by high-temperature stress in Arabidopsis thaliana. We found that its transcription is significantly higher in the Japanese ecotype Kyoto. Considering that transposons are epigenetically regulated, DNA methylation levels were analyzed, revealing that CHH methylation was reduced in Kyoto compared to the standard ecotype, Col-0. A mutation was also detected in the Kyoto CMT2 gene, encoding a CHH methyltransferase, suggesting that it may be responsible for increased expression of ONSEN. CHH methylation is controlled by histone modifications through a self-reinforcing loop between DNA methyltransferase and histone methyltransferase. Analysis of these modifications revealed that the level of H3K9me2, a repressive histone marker for gene expression, was lower in Kyoto than in Col-0. The level of another repressive histone marker, H3K27me1, was decreased in Kyoto; however, it was not impacted in a Col-0 cmt2 mutant. Therefore, in addition to the CMT2 mutation, other factors may reduce repressive histone modifications in Kyoto.

    DOI: 10.3389/fpls.2022.899105

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  • Single-cell RNA-seq analysis reveals ploidy-dependent and cell-specific transcriptome changes in Arabidopsis female gametophytes. 国際誌

    Qingxin Song, Atsumi Ando, Ning Jiang, Yoko Ikeda, Z Jeffrey Chen

    Genome biology   21 ( 1 )   178 - 178   2020年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Polyploidy provides new genetic material that facilitates evolutionary novelty, species adaptation, and crop domestication. Polyploidy often leads to an increase in cell or organism size, which may affect transcript abundance or transcriptome size, but the relationship between polyploidy and transcriptome changes remains poorly understood. Plant cells often undergo endoreduplication, confounding the polyploid effect. RESULTS: To mitigate these effects, we select female gametic cells that are developmentally stable and void of endoreduplication. Using single-cell RNA sequencing (scRNA-seq) in Arabidopsis thaliana tetraploid lines and isogenic diploids, we show that transcriptome abundance doubles in the egg cell and increases approximately 1.6-fold in the central cell, consistent with cell size changes. In the central cell of tetraploid plants, DEMETER (DME) is upregulated, which can activate PRC2 family members FIS2 and MEA, and may suppress the expression of other genes. Upregulation of cell size regulators in tetraploids, including TOR and OSR2, may increase the size of reproductive cells. In diploids, the order of transcriptome abundance is central cell, synergid cell, and egg cell, consistent with their cell size variation. Remarkably, we uncover new sets of female gametophytic cell-specific transcripts with predicted biological roles; the most abundant transcripts encode families of cysteine-rich peptides, implying roles in cell-cell recognition during double fertilization. CONCLUSIONS: Transcriptome in single cells doubles in tetraploid plants compared to diploid, while the degree of change and relationship to the cell size depends on cell types. These scRNA-seq resources are free of cross-contamination and are uniquely valuable for advancing plant hybridization, reproductive biology, and polyploid genomics.

    DOI: 10.1186/s13059-020-02094-0

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  • Reprogramming of the Developmental Program of Rhus javanica During Initial Stage of Gall Induction by Schlechtendalia chinensis. 査読 国際誌

    Tomoko Hirano, Seisuke Kimura, Tomoaki Sakamoto, Ayaka Okamoto, Takumi Nakayama, Takakazu Matsuura, Yoko Ikeda, Seiji Takeda, Yoshihito Suzuki, Issei Ohshima, Masa H Sato

    Frontiers in plant science   11   471 - 471   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Insect galls are unique organs that provide shelter and nutrients to the gall-inducing insects. Although insect galls are fascinating structures for their unique shapes and functions, the process by which gall-inducing insects induce such complex structures is not well understood. Here, we performed RNA-sequencing-based comparative transcriptomic analysis of the early developmental stage of horned gall to elucidate the early gall-inducing process carried out by the aphid, Schlechtendalia chinensis, in the Chinese sumac, Rhus javanica. There was no clear similarity in the global gene expression profiles between the gall tissue and other tissues, and the expression profiles of various biological categories such as phytohormone metabolism and signaling, stress-response pathways, secondary metabolic pathways, photosynthetic reaction, and floral organ development were dramatically altered. Particularly, master transcription factors that regulate meristem, flower, and fruit development, and biotic and abiotic stress-responsive genes were highly upregulated, whereas the expression of genes related to photosynthesis strongly decreased in the early stage of the gall development. In addition, we found that the expression of class-1 KNOX genes, whose ectopic overexpression is known to lead to the formation of de novo meristematic structures in leaf, was increased in the early development stage of gall tissue. These results strengthen the hypothesis that gall-inducing insects convert source tissues into fruit-like sink tissues by regulating the gene expression of host plants and demonstrate that such manipulation begins from the initial process of gall induction.

    DOI: 10.3389/fpls.2020.00471

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  • Life-course monitoring of endogenous phytohormone levels under field conditions reveals diversity of physiological states among barley accessions. 査読

    Takashi Hirayama, Daisuke Saisho, Takakazu Matsuura, Satoshi Okada, Kotaro Takahagi, Asaka Kanatani, Jun Ito, Hiroyuki Tsuji, Yoko Ikeda, Keiichi Mochida

    Plant & cell physiology   61 ( 8 )   1438 - 1448   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Agronomically important traits often develop during the later stages of crop growth as consequences of various plant-environment interactions. Therefore, the temporal physiological states that change and accumulate during the crop's life course can significantly affect the eventual phenotypic differences in agronomic traits among crop varieties. Thus, to improve productivity, it is important to elucidate the associations between temporal physiological responses during the growth of different crop varieties and their agronomic traits. However, data representing the dynamics and diversity of physiological states in plants grown under field conditions is sparse. In this study, we quantified the endogenous levels of five phytohormones-auxin, cytokinins, abscisic acid, jasmonate, and salicylic acid-in the leaves of eight diverse barley (Hordeum vulgare) accessions grown under field conditions sampled weekly over their life course to assess the ongoing fluctuations in hormone levels in the different accessions under field growth conditions. Notably, we observed enormous changes over time in the development-related plant hormones, such as auxin and cytokinins. Using 3' RNA-seq-based transcriptome data from the same samples, we investigated the expression of barley genes orthologous to known hormone-related genes of Arabidopsis throughout the life course. These data illustrated the dynamics and diversity of the physiological states of these field-grown barley accessions. Together our findings provide new insights into plant-environment interaction, highlighting that there is cultivar diversity in physiological responses during growth under field conditions.

    DOI: 10.1093/pcp/pcaa046

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  • Regulation of the Poly(A) Status of Mitochondrial mRNA by Poly(A)-Specific Ribonuclease Is Conserved among Land Plants. 査読

    Mai Kanazawa, Yoko Ikeda, Ryuichi Nishihama, Shohei Yamaoka, Nam-Hee Lee, Katsuyuki T Yamato, Takayuki Kohchi, Takashi Hirayama

    Plant & cell physiology   61 ( 3 )   470 - 480   2020年3月

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    記述言語:英語  

    Regulation of the stability and the quality of mitochondrial RNA is essential for the maintenance of mitochondrial and cellular functions in eukaryotes. We have previously reported that the eukaryotic poly(A)-specific ribonuclease (PARN) and the prokaryotic poly(A) polymerase encoded by AHG2 and AGS1, respectively, coordinately regulate the poly(A) status and the stability of mitochondrial mRNA in Arabidopsis. Mitochondrial function of PARN has not been reported in any other eukaryotes. To know how much this PARN-based mitochondrial mRNA regulation is conserved among plants, we studied the AHG2 and AGS1 counterparts of the liverwort, Marchantia polymorpha, a member of basal land plant lineage. We found that M. polymorpha has one ortholog each for AHG2 and AGS1, named MpAHG2 and MpAGS1, respectively. Their Citrine-fused proteins were detected in mitochondria of the liverwort. Molecular genetic analysis showed that MpAHG2 is essential and functionally interacts with MpAGS1 as observed in Arabidopsis. A recombinant MpAHG2 protein had a deadenylase activity in vitro. Overexpression of MpAGS1 and the reduced expression of MpAHG2 caused an accumulation of polyadenylated Mpcox1 mRNA. Furthermore, MpAHG2 suppressed Arabidopsis ahg2-1 mutant phenotype. These results suggest that the PARN-based mitochondrial mRNA regulatory system is conserved in land plants.

    DOI: 10.1093/pcp/pcz212

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  • Transcriptome Analysis and Identification of a Transcriptional Regulatory Network in the Response to H2O2 査読

    Ayaka Hieno, Hushna Ara Naznin, Keiko Inaba-Hasegawa, Tomoko Yokogawa, Natsuki Hayami, Mika Nomoto, Yasuomi Tada, Takashi Yokogawa, Mieko Higuchi-Takeuchi, Kosuke Hanada, Minami Matsui, Yoko Ikeda, Yuko Hojo, Takashi Hirayama, Kazutaka Kusunoki, Hiroyuki Koyama, Nobutaka Mitsuda, Yoshiharu Y. Yamamoto

    Plant Physiology   2019年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Society of Plant Biologists ({ASPB})  

    DOI: 10.1104/pp.18.01426

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  • Overexpression of Prunus DAM6 inhibits growth, represses bud break competency of dormant buds and delays bud outgrowth in apple plants 査読

    Yamane, Hisayo, Wada, Masato, Honda, Chikako, Matsuura, Takakazu, Ikeda, Yoko, Hirayama, Takashi, Osako, Yutaro, Gao-Takai, Mei, Kojima, Mikiko, Sakakibara, Hitoshi, Tao, Ryutaro

    PLOS ONE   14 ( 4 )   e0214788   2019年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PUBLIC LIBRARY SCIENCE  

    Most deciduous fruit trees cultivated in the temperate zone require a genotype-dependent amounts of chilling exposure for dormancy release and bud break. In Japanese apricot (Prunus mume), DORMANCY-ASSOCIATED MADS-box 6 (PmDAM6) may influence chilling-mediated dormancy release and bud break. In this study, we attempted to elucidate the biological functions of PmDAM6 related to dormancy regulation by analyzing PmDAM6-overexpressing transgenic apple (Malusspp.). We generated 35S:PmDAM6 lines and chemically inducible overexpression lines, 35S:PmDAM6-GR. In both overexpression lines, shoot growth was inhibited and early bud set was observed. In addition, PmDAM6 expression repressed bud break competency during dormancy and delayed bud break. Moreover, PmDAM6 expression increased abscisic acid levels and decreased cytokinins contents during the late dormancy and bud break stages in both 35S:PmDAM6 and 35S:PmDAM6-GR. Our analysis also suggested that abscisic acid levels increased during dormancy but subsequently decreased during dormancy release whereas cytokinins contents increased during the bud break stage in dormant Japanese apricot buds. We previously revealed that PmDAM6 expression is continuously down-regulated during dormancy release toward bud break in Japanese apricot. The PmDAM6 expression pattern was concurrent with a decrease and increase in the abscisic acid and cytokinins contents, respectively, in dormant Japanese apricot buds. Therefore, we hypothesize that PmDAM6 represses the bud break competency during dormancy and bud break stages in Japanese apricot by modulating abscisic acid and cytokinins accumulation in dormant buds.

    DOI: 10.1371/journal.pone.0214788

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  • Global transcriptome analyses reveal that infection with chrysanthemum stunt viroid (CSVd) affects gene expression profile of chrysanthemum plants, but the genes involved in plant hormone metabolism and signaling may not be silencing target of CSVd-siRNAs 査読

    Takino H, Kitajima S, Hirano S, Oka M, Matsuura T, Ikeda Y, Kojima M, Takebayashi Y, Sakakibara H, Mino M

    Plant Gene   18 ( Article100181 )   100181 - 100181   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.plgene.2019.100181

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  • Loss of CG methylation in Marchantia polymorpha causes disorganization of cell division and reveals unique DNA methylation regulatory mechanisms of non-CG methylation. 査読

    Ikeda Y, Nishihama R, Yamaoka S, Arteaga-Vazquez MA, Aguilar-Cruz A, Grimanelli D, Pogorelcnik R, Martienssen RA, Yamato KT, Kohchi T, Hirayama T, Mathieu O

    Plant and Cell Physiology   59 ( 12 )   2421 - 2431   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1093/pcp/pcy161

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  • FACT complex is required for DNA demethylation at heterochromatin during reproduction in Arabidopsis 査読

    Jennifer M. Frost, M. Yvonne Kim, Guen Tae Park, Ping-Hung Hsieh, Miyuki Nakamura, Samuel J. H. Lin, Hyunjin Yoo, Jaemyung Choi, Yoko Ikeda, Tetsu Kinoshita, Yeonhee Choi, Daniel Zilberman, Robert L. Fischer

    Proceedings of the National Academy of Sciences of the United States of America   115 ( 20 )   E4720 - E4729   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:National Academy of Sciences  

    The DEMETER (DME) DNA glycosylase catalyzes genome-wide DNA demethylation and is required for endosperm genomic imprinting and embryo viability. Targets of DME-mediated DNA demethylation reside in small, euchromatic, AT-rich transposons and at the boundaries of large transposons, but how DME interacts with these diverse chromatin states is unknown. The STRUCTURE SPECIFIC RECOGNITION PROTEIN 1 (SSRP1) subunit of the chromatin remodeler FACT (facilitates chromatin transactions), was previously shown to be involved in the DME-dependent regulation of genomic imprinting in Arabidopsis endosperm. Therefore, to investigate the interaction between DME and chromatin, we focused on the activity of the two FACT subunits, SSRP1 and SUPPRESSOR of TY16 (SPT16), during reproduction in Arabidopsis. We found that FACT colocalizes with nuclear DME in vivo, and that DME has two classes of target sites, the first being euchromatic and accessible to DME, but the second, representing over half of DME targets, requiring the action of FACT for DME-mediated DNA demethylation genome-wide. Our results show that the FACT-dependent DME targets are GC-rich heterochromatin domains with high nucleosome occupancy enriched with H3K9me2 and H3K27me1. Further, we demonstrate that heterochromatin-associated linker histone H1 specifically mediates the requirement for FACT at a subset of DME-target loci. Overall, our results demonstrate that FACT is required for DME targeting by facilitating its access to heterochromatin.

    DOI: 10.1073/pnas.1713333115

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  • Insights into Land Plant Evolution Garnered from the Marchantia polymorpha Genome. 査読 国際誌

    John L Bowman, Takayuki Kohchi, Katsuyuki T Yamato, Jerry Jenkins, Shengqiang Shu, Kimitsune Ishizaki, Shohei Yamaoka, Ryuichi Nishihama, Yasukazu Nakamura, Frédéric Berger, Catherine Adam, Shiori Sugamata Aki, Felix Althoff, Takashi Araki, Mario A Arteaga-Vazquez, Sureshkumar Balasubrmanian, Kerrie Barry, Diane Bauer, Christian R Boehm, Liam Briginshaw, Juan Caballero-Perez, Bruno Catarino, Feng Chen, Shota Chiyoda, Mansi Chovatia, Kevin M Davies, Mihails Delmans, Taku Demura, Tom Dierschke, Liam Dolan, Ana E Dorantes-Acosta, D Magnus Eklund, Stevie N Florent, Eduardo Flores-Sandoval, Asao Fujiyama, Hideya Fukuzawa, Bence Galik, Daniel Grimanelli, Jane Grimwood, Ueli Grossniklaus, Takahiro Hamada, Jim Haseloff, Alexander J Hetherington, Asuka Higo, Yuki Hirakawa, Hope N Hundley, Yoko Ikeda, Keisuke Inoue, Shin-Ichiro Inoue, Sakiko Ishida, Qidong Jia, Mitsuru Kakita, Takehiko Kanazawa, Yosuke Kawai, Tomokazu Kawashima, Megan Kennedy, Keita Kinose, Toshinori Kinoshita, Yuji Kohara, Eri Koide, Kenji Komatsu, Sarah Kopischke, Minoru Kubo, Junko Kyozuka, Ulf Lagercrantz, Shih-Shun Lin, Erika Lindquist, Anna M Lipzen, Chia-Wei Lu, Efraín De Luna, Robert A Martienssen, Naoki Minamino, Masaharu Mizutani, Miya Mizutani, Nobuyoshi Mochizuki, Isabel Monte, Rebecca Mosher, Hideki Nagasaki, Hirofumi Nakagami, Satoshi Naramoto, Kazuhiko Nishitani, Misato Ohtani, Takashi Okamoto, Masaki Okumura, Jeremy Phillips, Bernardo Pollak, Anke Reinders, Moritz Rövekamp, Ryosuke Sano, Shinichiro Sawa, Marc W Schmid, Makoto Shirakawa, Roberto Solano, Alexander Spunde, Noriyuki Suetsugu, Sumio Sugano, Akifumi Sugiyama, Rui Sun, Yutaka Suzuki, Mizuki Takenaka, Daisuke Takezawa, Hirokazu Tomogane, Masayuki Tsuzuki, Takashi Ueda, Masaaki Umeda, John M Ward, Yuichiro Watanabe, Kazufumi Yazaki, Ryusuke Yokoyama, Yoshihiro Yoshitake, Izumi Yotsui, Sabine Zachgo, Jeremy Schmutz

    Cell   171 ( 2 )   287 - 304   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The evolution of land flora transformed the terrestrial environment. Land plants evolved from an ancestral charophycean alga from which they inherited developmental, biochemical, and cell biological attributes. Additional biochemical and physiological adaptations to land, and a life cycle with an alternation between multicellular haploid and diploid generations that facilitated efficient dispersal of desiccation tolerant spores, evolved in the ancestral land plant. We analyzed the genome of the liverwort Marchantia polymorpha, a member of a basal land plant lineage. Relative to charophycean algae, land plant genomes are characterized by genes encoding novel biochemical pathways, new phytohormone signaling pathways (notably auxin), expanded repertoires of signaling pathways, and increased diversity in some transcription factor families. Compared with other sequenced land plants, M. polymorpha exhibits low genetic redundancy in most regulatory pathways, with this portion of its genome resembling that predicted for the ancestral land plant. PAPERCLIP.

    DOI: 10.1016/j.cell.2017.09.030

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  • The SAL-PAP Chioroplast Retrograde Pathway Contributes to Plant Immunity by Regulating Glucosinolate Pathway and Phytohormone Signaling 査読

    Yasuhiro Ishiga, Mutsumi Watanabe, Takako Ishiga, Takayuki Tohge, Takakazu Matsuura, Yoko Ikeda, Rainer Hoefgen, Alisdair R. Fernie, Kirankumar S. Mysore

    MOLECULAR PLANT-MICROBE INTERACTIONS   30 ( 10 )   829 - 841   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYTOPATHOLOGICAL SOC  

    Chloroplasts have a crucial role in plant immunity against pathogens. Increasing evidence suggests that phytopathogens target chloroplast homeostasis as a pathogenicity mechanism. In order to regulate the performance of chloroplasts under stress conditions, chloroplasts produce retrograde signals to alter nuclear gene expression. Many signals for the chloroplast retrograde pathway have been identified, including chlorophyll intermediates, reactive oxygen species, and metabolic retrograde signals. Although there is a reasonably good understanding of chloroplast retrograde signaling in plant immunity, some signals are not well understood. In order to understand the role of chloroplast retrograde signaling in plant immunity, we investigated Arabidopsis chloroplast retrograde signaling mutants in response to pathogen inoculation. sail mutants (fiyl-2 and alx8) responsible for the SALT-PAP retrograde signaling pathway showed enhanced disease symptoms not only to the hemibiotrophic pathogen Pseudomonas syringae pv. tomato DC3000 but, also, to the necrotrophic pathogen Pectobacterium carotovorum subsp. carotovorum EC1. Glucosinolate profiles demonstrated the reduced accumulation of aliphatic glucosinolates in the fiyI-2 and alx8 mutants compared with the wild-type Col-0 in response to DC3000 infection. In addition, quantification of multiple phytohormones and analyses of their gene expression profiles revealed that both the salicylic acid (SA)- and jasmonic acid (JA)-mediated signaling pathways were down-regulated in the fiy1-2 and alx8 mutants. These results suggest that the SALT-PAP chloroplast retrograde pathway is involved in plant immunity by regulating the SA- and JA-mediated signaling pathways.

    DOI: 10.1094/MPMI-03-17-0055-R

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  • Global profiling of phytohormone dynamics during combined drought and pathogen stress in Arabidopsis thaliana reveals ABA and JA as major regulators 査読

    Aarti Gupta, Hiroshi Hisano, Yuko Hojo, Takakazu Matsuura, Yoko Ikeda, Izumi C. Mori, Muthappa Senthil-Kumar

    SCIENTIFIC REPORTS   7 ( 1 )   4017   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATURE PUBLISHING GROUP  

    Global transcriptome studies demonstrated the existence of unique plant responses under combined stress which are otherwise not seen during individual stresses. In order to combat combined stress plants use signaling pathways and 'cross talk' mediated by hormones involved in stress and growth related processes. However, interactions among hormones' pathways in combined stressed plants are not yet known. Here we studied dynamics of different hormones under individual and combined drought and pathogen infection in Arabidopsis thaliana by liquid chromatography-mass spectrometry (LC-MS) based profiling. Our results revealed abscisic acid (ABA) and salicylic acid (SA) as key regulators under individual drought and pathogen stress respectively. Under combined drought and host pathogen stress (DH) we observed non-induced levels of ABA with an upsurge in SA and jasmonic acid (JA) concentrations, underscoring their role in basal tolerance against host pathogen. Under a non-host pathogen interaction with drought (DNH) stressed plants, ABA, SA and JA profiles were similar to those under DH or non-host pathogen alone. We propose that plants use SA/JA dependent signaling during DH stress which antagonize ABA biosynthesis and signaling pathways during early stage of stress. The study provides insights into hormone modulation at different time points during combined stress.

    DOI: 10.1038/s41598-017-03907-2

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  • Ectopic accumulation of linalool confers resistance to Xanthomonas citri subsp citri in transgenic sweet orange plants 査読

    Takehiko Shimada, Tomoko Endo, Ana Rodriguez, Hiroshi Fujii, Shingo Goto, Takakazu Matsuura, Yuko Hojo, Yoko Ikeda, Izumi C. Mori, Takashi Fujikawa, Leandro Pena, Mitsuo Omura

    TREE PHYSIOLOGY   37 ( 5 )   654 - 664   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS  

    In order to clarify whether high linalool content in citrus leaves alone induces strong field resistance to citrus canker caused by Xanthomonas citri subsp. citri (Xcc), and to assess whether this trait can be transferred to a citrus type highly sensitive to the bacterium, transgenic 'Hamlin' sweet orange (Citrus sinensis L. Osbeck) plants over-expressing a linalool synthase gene (CuSTS3-1) were generated. Transgenic lines (LIL) with the highest linalool content showed strong resistance to citrus canker when spray inoculated with the bacterium. In LIL plants inoculated by wounding (multiple-needle inoculation), the linalool level was correlated with the repression of the bacterial titer and up-regulation of defense-related genes. The exogenous application of salicylic acid, methyl jasmonate or linalool triggered responses similar to those constitutively induced in LIL plants. The linalool content in Ponkan mandarin leaves was significantly higher than that of leaves from six other representative citrus genotypes with different susceptibilities to Xcc. We propose that linalool-mediated resistance might be unique to citrus tissues accumulating large amounts of volatile organic compounds in oil cells. Linalool might act not only as a direct antibacterial agent, but also as a signal molecule involved in triggering a non-host resistance response against Xcc.

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  • Arabidopsis proteins with a transposon-related domain act in gene silencing 査読

    Yoko Ikeda, Thierry Pelissier, Pierre Bourguet, Claude Becker, Marie-Noelle Pouch-Pelissier, Romain Pogorelcnik, Magdalena Weingartner, Detlef Weigel, Jean-Marc Deragon, Olivier Mathieu

    NATURE COMMUNICATIONS   8   15122   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATURE PUBLISHING GROUP  

    Transposable elements (TEs) are prevalent in most eukaryotes, and host genomes have devised silencing strategies to rein in TE activity. One of these, transcriptional silencing, is generally associated with DNA methylation and short interfering RNAs. Here we show that the Arabidopsis genes MAIL1 and MAIN define an alternative silencing pathway independent of DNA methylation and short interfering RNAs. Mutants for MAIL1 or MAIN exhibit release of silencing and appear to show impaired condensation of pericentromeric heterochromatin. Phylogenetic analysis suggests not only that MAIL1 and MAIN encode a retrotransposon-related plant mobile domain, but also that host plant mobile domains were captured by DNA transposons during plant evolution. Our results reveal a role for Arabidopsis proteins with a transposon-related domain in gene silencing.

    DOI: 10.1038/ncomms15122

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  • Phytohormones in red seaweeds: a technical review of methods for analysis and a consideration of genomic data 査読

    Izumi C. Mori, Yoko Ikeda, Takakazu Matsuura, Takashi Hirayama, Koji Mikami

    BOTANICA MARINA   60 ( 2 )   153 - 170   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WALTER DE GRUYTER GMBH  

    Emerging studies suggest that seaweeds contain phytohormones; however, their chemical entities, biosynthetic pathways, signal transduction mechanisms, and physiological roles are poorly understood. Until recently, it was difficult to conduct comprehensive analysis of phytohormones in seaweeds because of the interfering effects of cellular constituents on fine quantification. In this review, we discuss the details of the latest method allowing simultaneous profiling of multiple phytohormones in red seaweeds, while avoiding the effects of cellular factors. Recent studies have confirmed the presence of indole-3-acetic acid (IAA), N-6-(Delta(2)-isopentenyl) adenine (iP), (+)-abscisic acid (ABA), and salicylic acid, but not of gibberellins and jasmonate, in Pyropia yezoensis and Bangia fuscopurpurea. In addition, an in silico genome-wide homology search indicated that red seaweeds synthesize iP and ABA via pathways similar to those in terrestrial plants, although genes homologous to those involved in IAA biosynthesis in terrestrial plants were not found, suggesting the epiphytic origin of IAA. It is noteworthy that these seaweeds also lack homologues of known factors involved in the perception and signal transduction of IAA, iP, and ABA. Thus, the modes of action of these phytohormones in red seaweeds are unexpectedly dissimilar to those in terrestrial plants.

    DOI: 10.1515/bot-2016-0056

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  • NADPH-dependent thioredoxin reductase C plays a role in nonhost disease resistance against Pseudomonas syringae pathogens by regulating chloroplast-generated reactive oxygen species 査読

    Yasuhiro Ishiga, Takako Ishiga, Yoko Ikeda, Takakazu Matsuura, Kirankumar S. Mysore

    PEERJ   4   e1938   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PEERJ INC  

    Chloroplasts are cytoplasmic organelles for photosynthesis in eukaryotic cells. In addition, recent studies have shown that chloroplasts have a critical role in plant innate immunity against invading pathogens. Hydrogen peroxide is a toxic by-product from photosynthesis, which also functions as a signaling compound in plant Innate immunity. Therefore, it is important to regulate the level of hydrogen peroxide In response to pathogens. Chloroplasts maintain components of the redox detoxificaption system including enzymes such as 2-Cys peroxiredoxins (2-Cys Prxs), and NA dependent thioredoxin reductase C (NTRC). However, the significance of 2-Cys Prxs and NTRC in the molecular basis of nonhost' disease resistance is largely unknown. We W response to nonhost Pseudomonas evaluated the roles of Prxs and NTRC using lmock-out mutants of Arabidopsis in syringae pathogens. Plants lacking functional NTRC showed localized cell death (LCD) accompanied by the elevated accumulationf hydrogen peroxide in response to nonhost pathogens. Interestingly, the Arabidopsis :311-rcmutant showed enhancedep bacterial growth,and diseae analyses sesnuascesepsnbilit including ofnonhost pathogens. Furthermore, thex ression profiles of the salicylic acid (SA) and jasmonic acid (JA)-mediated signaling pathways and phytonormon SA and JA revealed that the Arabidopsis ntrc mutant shows elevated JA-mediated signaling pathways in response to non host pathogen. These results suggest the critical role of NTRC in plant innate immunity against nonhost P. syringae pathogens.

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  • Epigenome confrontation triggers immediate reprogramming of DNA methylation and transposon silencing in Arabidopsis thaliana F1 epihybrids 査読

    Melanie Rigal, Claude Becker, Thierry Pelissier, Romain Pogorelcnik, Jane Devos, Yoko Ikeda, Detlef Weigel, Olivier Mathieu

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   113 ( 14 )   E2083 - E2092   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATL ACAD SCIENCES  

    Genes and transposons can exist in variable DNA methylation states, with potentially differential transcription. How these epialleles emerge is poorly understood. Here, we show that crossing an Arabidopsis thaliana plant with a hypomethylated genome and a normally methylated WT individual results, already in the F1 generation, in widespread changes in DNA methylation and transcription patterns. Novel nonparental and heritable epialleles arise at many genic loci, including a locus that itself controls DNA methylation patterns, but with most of the changes affecting pericentromeric transposons. Although a subset of transposons show immediate resilencing, a large number display decreased DNA methylation, which is associated with de novo or enhanced transcriptional activation and can translate into transposon mobilization in the progeny. Our findings reveal that the combination of distinct epigenomes can be viewed as an epigenomic shock, which is characterized by a round of epigenetic variation creating novel patterns of gene and TE regulation.

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  • Light Inhibition of Shoot Regeneration Is Regulated by Endogenous Abscisic Acid Level in Calli Derived from Immature Barley Embryos 査読

    Kazuhide Rikiishi, Takakazu Matsuura, Yoko Ikeda, Masahiko Maekawa

    PLOS ONE   10 ( 12 )   e0145242   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PUBLIC LIBRARY SCIENCE  

    Shoot regeneration in calli derived from immature barley embryos is regulated by light conditions during the callus-induction period. Barley cultivars Kanto Nijo-5 (KN5) and K-3 (K3) showed lower efficiency of shoot regeneration in a 16-h photoperiod during callus-induction than those in continuous darkness, whereas shoot regeneration was enhanced in cultures under a 16-h photoperiod in Golden Promise (GP) and Lenins (LN). These cultivars were classified as photo-inhibition type (KN5 and K3) or photo-induction type (GP and LN) according to their response to light. Contents of endogenous plant hormones were determined in calli cultured under a 16-h photoperiod and continuous darkness. In photo-inhibition type, higher accumulation of abscisic acid (ABA) was detected in calli cultured under a 16-h photoperiod, whereas calli showed lower levels of endogenous ABA in continuous darkness. However, cultivars of photo-induction type showed lower levels of ABA in calli cultured under both light conditions, similarly to photo-inhibition type in continuous darkness. Exogenous ABA inhibited the callus growth and shoot regeneration independent of light conditions in all cultivars. In photo-inhibition type, lower levels of endogenous ABA induced by ABA biosynthesis inhibitor, fluridone, reduced the photo-inhibition of shoot regeneration. Expression of ABA biosynthesis gene, HvNCED1, in calli was regulated by the light conditions. Higher expression was observed in calli cultured under a 16-h photoperiod. These results indicate that ABA biosynthesis could be activated through the higher expression of HvNCED1 in a 16-h photoperiod and that the higher accumulations of ABA inhibit shoot regeneration in the photo-inhibition type cultivars.

    DOI: 10.1371/journal.pone.0145242

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  • Comprehensive quantification and genome survey reveal the presence of novel phytohormone action modes in red seaweeds. 査読

    Mikami, K, Mori, I.C, Matsuura, T, Ikeda, Y, Kojima, M, Sakakibara, H, Hirayama, T

    J. Applied Phycology   28   2539 - 2548   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Plant Imprinted Genes Identified by Genome-wide Approaches and Their Regulatory Mechanisms 査読

    Yoko Ikeda

    PLANT AND CELL PHYSIOLOGY   53 ( 5 )   809 - 816   2012年5月

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

    Genomic imprinting is an epigenetic phenomenon found in mammals and flowering plants that leads to differential allelic gene expression depending on their parent of origin. In plants, genomic imprinting primarily occurs in the endosperm, and it is associated with seed development. The imprinted expression is driven by the epigenetic memory programmed in each lineage of female and male germlines. Several imprinted genes have been identified based on genetic studies in maize and Arabidopsis. Recent advances in genome-wide analyses made it possible to identify multiple imprinted genes including many nuclear proteins, such as transcription factors and chromatin-related proteins in different plant species. Some of these genes are conserved in Arabidopsis, rice and maize, but many are species specific. Genome-wide analyses also clarified the regulation mechanism of imprinted genes orchestrated by DNA methylation and histone methylation marks. Additionally, genetic analyses using Arabidopsis revealed new regulatory factors of DNA demethylation and imprinting and shed light on the more precise mechanisms.

    DOI: 10.1093/pcp/pcs049

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  • HMG Domain containing SSRP1 is required for DNA demethylation and genomic imprinting in arabidopsis 査読

    Yoko Ikeda, Yuki Kinoshita, Daichi Susaki, Yuriko Ikeda, Megumi Iwano, Seiji Takayama, Tetsuya Higashiyama, Tetsuji Kakutani, Tetsu Kinoshita

    Developmental Cell   21 ( 3 )   589 - 596   2011年9月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:3  

    In Arabidopsis, DEMETER (DME) DNA demethylase contributes to reprogramming of the epigenetic state of the genome in the central cell. However, other aspects of the active DNA demethylation processes remain elusive. Here we show that Arabidopsis SSRP1, known as an HMG domain-containing component of FACT histone chaperone, is required for DNA demethylation and for activation and repression of many parentally imprinted genes in the central cell. Although loss of DNA methylation releases silencing of the imprinted FWA-GFP, double ssrp1-3;. met1-3 mutants surprisingly showed limited activation of maternal FWA-GFP in the central cell, and only became fully active after several nuclear divisions in the endosperm. This behavior was in contrast to the dme-1;. met1 double mutant in which hypomethylation of FWA-GFP by met1 suppressed the DNA demethylation defect of dme-1. We propose that active DNA demethylation by DME requires SSRP1 function through a distinctly different process from direct DNA methylation control. © 2011 Elsevier Inc.

    DOI: 10.1016/j.devcel.2011.08.013

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  • DNA demethylation: A lesson from the garden 査読

    Yoko Ikeda, Tetsu Kinoshita

    Chromosoma   118 ( 1 )   37 - 41   2009年

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    出版者・発行元:1  

    Gene silencing by DNA methylation is well documented and known to be essential for various biological phenomena in many organisms. In contrast, the processes that convert the silent state of a gene whose DNA is methylated and predicted to form facultative heterochromatin to the actively transcribed state remain elusive. In Arabidopsis, recent studies have shown that the DNA glycosylases DEMETER (DME) and REPRESSOR OF SILENCING1 (ROS1) participate in DNA demethylation. DME is necessary for genomic imprinting in the endosperm, while ROS1 is involved in pruning DNA methylation patterns in transposons and genic regions of vegetative tissues. These findings provide us with molecular clues for understanding the underlying mechanisms of DNA demethylation and gene activation. In this review, we will consider and discuss the processes of controlling gene activation through DNA demethylation, which are predicted to include the recognition of target sequences, DNA demethylation, the transformation of the chromatin to the active state, and transcription. Many of these processes remain poorly understood at this stage. © Springer-Verlag 2008.

    DOI: 10.1007/s00412-008-0183-3

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  • Genomic imprinting: A balance between antagonistic roles of parental chromosomes 査読

    Tetsu Kinoshita, Yoko Ikeda, Ryo Ishikawa

    Seminars in Cell and Developmental Biology   19 ( 6 )   574 - 579   2008年12月

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    出版者・発行元:6  

    Maternally and paternally derived chromosomes might be expected to contribute equally to the various cellular and developmental processes in placental mammals and flowering plants. However, this is not true even in the case of the self-pollinated plant, Arabidopsis, which has identical DNA sequences in both parental genomes. The reason for this is that some genes, called "imprinted genes", are expressed exclusively from paternally or maternally inherited chromosomes. As a result, parental chromosomes express a distinct set of genes and play different roles in biological processes. Here, we review and compare roles of genomic imprinting in flowering plants and placental mammals. © 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.semcdb.2008.07.018

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  • Molecular basis of late-flowering phenotype caused by dominant epi-alleles of the FWA locus in Arabidopsis 査読

    Yoko Ikeda, Yasushi Kobayashi, Ayako Yamaguchi, Mitsutomo Abe, Takashi Araki

    PLANT AND CELL PHYSIOLOGY   48 ( 2 )   205 - 220   2007年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS  

    The late-flowering phenotype of dominant fwa mutants is caused by hypomethylation in the FWA locus leading to ectopic expression of a homeodomain leucine zipper (HD-ZIP) protein. However, little is known about whether FWA has any role in regulation of flowering and how ectopically expressed FWA delays flowering. Through analysis of FWA expression in wild-type seedlings, it was shown that FWA is not expressed during the vegetative phase. This suggests that FWA has no role in flowering. The previous reports that fwa suppressed the precocious-flowering phenotype of plants overexpressing FLOWERING LOCUS T (FT) suggest that the flowering pathway(s) either at and/or downstream of FT is blocked by FWA. Comparison of gene expression profiles in three genetic backgrounds ectopically expressing FWA and their respective wild types failed to detect common changes, ruling out the possibility that FWA acts through transcriptional misregulation. Yeast two-hybrid analysis and in vitro pull-down assay showed that FWA protein can specifically interact with FT protein. The importance of protein interaction with FT in delaying flowering was supported by studies involving N-terminal and C-terminal truncations of FWA. The C-terminal truncation with abolished interaction did not delay flowering when overexpressed, while the N-terminal truncation, which retains interaction, did. Specific interaction of FWA with FT enabled us to use FWA protein as a specific inhibitor of FT protein function. Through tissue-specific ectopic expression of FWA, further support for the shoot apex being the site of action of FT protein was provided.

    DOI: 10.1093/pcp/pcl061

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  • FD, a bZIP protein mediating signals from the floral pathway integrator FT at the shoot apex 査読

    M Abe, Y Kobayashi, S Yamamoto, Y Daimon, A Yamaguchi, Y Ikeda, H Ichinoki, M Notaguchi, K Goto, T Araki

    SCIENCE   309 ( 5737 )   1052 - 1056   2005年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER ASSOC ADVANCEMENT SCIENCE  

    FLOWERING LOCUS T (FT) is a conserved promoter of flowering that acts downstream of various regulatory pathways, including one that mediates photoperiodic induction through CONSTANS (CO), and is expressed in the vasculature of cotyledons and leaves. A bZIP transcription factor, FD, preferentially expressed in the shoot apex is required for FT to promote flowering. FD and FT are interdependent partners through protein interaction and act at the shoot apex to promote floral transition and to initiate floral development through transcriptional activation of a floral meristem identity gene, APETALA1 (AP1). FT may represent a long-distance signal in flowering.

    DOI: 10.1126/science.1115983

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  • Flagella are required for complete virulence of Pseudomonas syringae pv. tabaci: genetic analysis with flagella-defective mutants, ΔfliC andΔfliD, in host tobacco plants. 査読

    Ichinose, Y, Shimizu, R, Ikeda, Y, Taguchi, F, Marutani, M, Mukaihara, T, Inagaki, Y, Toyoda, K, Shiraishi, T

    Journal of General Plant Pathology   69 ( 4 )   244 - 249   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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▼全件表示

書籍等出版物

  • In Protocols for macroalgae research.

    Matsuura, T, Mori, I. C, Ikeda, Y, Hirayama, T, Mikami, K( 担当: 分担執筆 ,  範囲: Comprehensive phytohormone quantification in the red alga Pyropia yezoensis by liquid chromatography–mass spectrometry.)

    CRC Press  2018年 

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  • Nuclear Functions in Plant Transcription, Signaling and Development.

    Ikeda, Y, Nishimura, T( 担当: 分担執筆 ,  範囲: CHAPTER 2: The role of DNA methylation in transposable element silencing and genomic imprinting.)

    Springer  2015年 

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  • 細胞工学 Vol.30

    池田陽子, 木下哲( 担当: 分担執筆 ,  範囲: HOT PRESS)

    2011年 

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  • 細胞工学 別冊 植物細胞工学 シリーズ 24 植物のエピジェネティクス

    池田陽子, 木下哲( 担当: 分担執筆 ,  範囲: 4-2 ゲノムインプリンティング)

    2008年 

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MISC

  • ゼニゴケにおける生殖を介したDNAメチル化の伝達機構

    池田陽子, 池田陽子, 中村光希, 十川太輔, 西浜竜一, 山岡尚平, 荒木崇, 河内孝之, MATHIEU Olivier, 大和勝幸

    日本植物学会大会研究発表記録(CD-ROM)   87th   2023年

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  • 形質予測モデル構築にむけた茎頂メリステムの連続的な発生ステート推移の解明

    井藤純, 野村有子, 高萩航太郎, 岡田聡史, 久下修平, 佐藤奈緒, 新井駿一, 松本大輝, 杉村みどり, 関緑, 服部公央亮, 梅崎太造, 池田陽子, 最相大輔, 持田恵一, 平山隆志, 辻寛之

    日本植物生理学会年会(Web)   63rd   2022年

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  • ライフコースデータを用いたデータ科学に基づく形質予測モデル構築

    平山隆志, 最相大輔, 井藤純, 服部公央亮, 岡田聡史, 池田陽子, 梅崎太造, 辻寛之, 持田恵一

    日本植物生理学会年会(Web)   63rd   2022年

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  • ゼニゴケMpROS1a,MpROS1xによるDNA脱メチル化制御

    池田陽子, 中村光希, 十川太輔, 西浜竜一, 山岡尚平, 荒木崇, 河内孝之, 大和勝幸

    日本植物学会大会研究発表記録(CD-ROM)   86th   2022年

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  • 状態形質を利用したデータ科学に基づく新たな形質予測モデル構築手法の開発

    平山隆志, 岡田聡史, 最相大輔, 井藤純, 服部公央亮, 池田陽子, 梅崎太造, 辻寛之, 持田恵一

    日本分子生物学会年会プログラム・要旨集(Web)   44th   2021年

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  • 先制育種’を指向する生活環横断的なオオムギのゲノム研究

    最相大輔, 岡田聡史, 金谷麻加, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 持田恵一, 持田恵一, 持田恵一, 平山隆志

    育種学研究   23   2021年

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  • 圃場トランスクリプトームデータを用いたオオムギ生活環の生長トラジェクトリ解析

    岡田聡史, 最相大輔, 金谷麻加, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 井上小槙, 上原由紀子, 清水みなみ, 持田恵一, 持田恵一, 持田恵一, 平山隆志

    育種学研究   23   2021年

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  • 圃場でのオオムギ生活環の擬時間変遷

    最相大輔, 岡田聡史, 金谷麻加, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 持田恵一, 持田恵一, 持田恵一, 平山隆志

    育種学研究   23   2021年

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  • 六倍体カキにおけるRADIALIS様遺伝子を介した両性花性の再構築

    増田佳苗, 池田陽子, 松浦恭和, 川勝泰二, 田尾龍太郎, 久保康隆, 牛島幸一郎, HENRY Isabelle M., 赤木剛士, 赤木剛士

    園芸学研究 別冊   20 ( 2 )   2021年

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  • ゼニゴケの新規DNAメチル化制御機構:植物と動物の狭間で

    池田陽子, 十川太輔, 西浜竜一, 山岡尚平, 荒木崇, 河内孝之, 平山隆志, 大和勝幸

    日本植物学会大会研究発表記録(CD-ROM)   84th   2020年

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  • 圃場オオムギを用いた時系列クロマチン修飾解析

    池田陽子, 金谷麻加, 井上小槙, 最相大輔, 井藤純, 辻寛之, 持田恵一, 持田恵一, 持田恵一, 平山隆志

    日本植物生理学会年会(Web)   60th   2019年

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  • PARN及びPAPはコケ類におけるミトコンドリアmRNAのポリ(A)状態を調節する

    KANAZAWA Mai, IKEDA Yoko, NISHIHAMA Ryuichi, YAMAOKA Shohei, KOCHI Takayuki, HIRAYAMA Takashi

    日本RNA学会年会要旨集   18th   2016年

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  • Control of genomic imprinting by ALARM CLOCK1 gene in Arabidopsis

    Yoko Ikeda, Yuki Kinoshita, Tetsuji Kakutani, Tetsu Kinoshita

    GENES & GENETIC SYSTEMS   83 ( 6 )   534 - 534   2008年12月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:GENETICS SOC JAPAN  

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  • Molecular basis of late-flowering phenotype caused by dominant epi-alleles of the FWA locus in Arabidopsis (vol 48, pg 205, 2007)

    Yoko Ikeda, Yasushi Kobayashi, Ayako Yamaguchi, Mitsutomo Abe, Takashi Araki

    PLANT AND CELL PHYSIOLOGY   48 ( 3 )   562 - 562   2007年3月

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

    DOI: 10.1093/pcp/pcm026

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  • GL2-class HD-ZIP protein FWA delays flowering through specific interaction with FT protein

    Yoko Ikeda, Ayako Yamaguchi, Mitsutomo Abe, Takashi Araki

    PLANT AND CELL PHYSIOLOGY   48   S113 - S113   2007年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Long-distance signals to promote floral transition in Arabidopsis

    M Abe, Y Daimon, S Yamamoto, A Yamaguchi, Y Ikeda, M Notaguchi, T Araki

    PLANT AND CELL PHYSIOLOGY   47   S2 - S2   2006年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Dissection of flowering pathways using GL2-class HD-ZIP protein FWA

    Y Ikeda, M Abe, T Araki

    PLANT AND CELL PHYSIOLOGY   47   S65 - S65   2006年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Moleculer basis of late-flowering phenotype in dominant fwa mutants

    Y Ikeda, M Abe, T Araki

    PLANT AND CELL PHYSIOLOGY   46   S96 - S96   2005年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Reevaluation of the florigen hypothesis: A molecular genetic approach with Arabidopsis

    T Araki, Y Daimon, S Yamamoto, A Yamaguchi, Y Ikeda, M Notaguchi, M Kobayashi, K Goto, M Abe

    PLANT AND CELL PHYSIOLOGY   46   S10 - S10   2005年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Functional analysis of Arabidopsis FD protein by the C-terminal modification

    S Yamamoto, Y Ikeda, M Abe, T Araki

    PLANT AND CELL PHYSIOLOGY   46   S95 - S95   2005年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Dissection of flowering pathways using a GL2-type HD-ZIP gene FWA

    Y Ikeda, Y Kobayashi, M Abe, T Araki

    PLANT AND CELL PHYSIOLOGY   45   S71 - S71   2004年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Integration of regulatory pathways by flowering-genes FT and FD

    M Abe, S Yamamoto, Y Daimon, A Yamaguchi, Y Ikeda, H Ichinoki, M Notaguchi, T Araki

    PLANT AND CELL PHYSIOLOGY   45   S20 - S20   2004年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Dissection of flowering pathways using a GL2-type HD-ZIP gene FWA

    Y Ikeda, Y Kobayashi, M Abe, T Araki

    PLANT AND CELL PHYSIOLOGY   44   S133 - S133   2003年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • The importance of post-translational modification of bacterial HR-elicitor, flagellin on HR-inducing ability and pathogenicity

    F Taguchi, Y Ikeda, R Shimizu, K Takeuchi, Y Inagaki, T Shiraishi, Y Ichinose

    PLANT AND CELL PHYSIOLOGY   43   S201 - S201   2002年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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受賞

  • 奨励賞受賞

    2019年5月   日本エピジェネティクス研究会  

    池田 陽子

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  • 年会長賞

    2009年5月   日本エピジェネティクス研究会  

    池田 陽子

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共同研究・競争的資金等の研究

  • 植物進化過程における転写サイレンシング機能獲得機構

    研究課題/領域番号:22K06266  2022年04月 - 2025年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    池田 陽子

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    配分額:4160000円 ( 直接経費:3200000円 、 間接経費:960000円 )

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  • DNAメチル化ダイナミクス解析による生殖過程のDNAメチル化消去・維持機構の解明

    研究課題/領域番号:22H04693  2022年04月 - 2024年03月

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    池田 陽子

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    配分額:8580000円 ( 直接経費:6600000円 、 間接経費:1980000円 )

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  • 減数分裂におけるDNAメチル化の消去・維持機構の解明

    研究課題/領域番号:20H05391  2020年04月 - 2022年03月

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    池田 陽子

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    配分額:8320000円 ( 直接経費:6400000円 、 間接経費:1920000円 )

    DNAメチル化は'非ゲノム情報'のうち唯一世代を超えて安定的に伝わることが証明されている修飾であり、クロマチンとの相互作用を介して遺伝子の発現制御に関わることが知られている。DNAメチル化の次世代への伝達機構については、動物と植物の間で違いがみられ、動物では生殖系列でDNAメチル化がリプログラミングされ、雌雄のゲノムの差が生じる一方、被子植物では減数分裂後、胚乳系列でのみDNAメチル化が解除され、卵及び精細胞ではDNAメチル化が維持される。そのため植物ではDNAメチル化の変化が次の世代に伝わりうるとされている。
    そこで、植物特有のDNAメチル化維持機構がどのように進化してきたかを明らかにするため、本研究では、進化上、陸上植物の基部に位置するゼニゴケを用い解析を進めた。これまでに、我々の解析により、ゼニゴケにおけるDNAメチル化制御機構は被子植物と共通した特徴だけでなく、異なる制御の特徴を持つことを示唆する結果が得られている。本研究では特に、ゼニゴケの減数分裂前後におけるDNAメチル化の制御機構に焦点を当て、解析を行った。
    今年度は、ゼニゴケのDNAメチル化の詳細な解析を進めるための育成環境や生殖器の誘導条件など、実験に必要な材料の準備を行った。環境が整い、サンプリングの技術等の条件が整い、次世代シーケンサを用いたゲノムワイドバイサルファイト解析を行う状況が整った。また、ゼニゴケにおいてDNAメチル化に関与する因子の変異体を作成し、詳細な機能解析を進めている。

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  • 植物における新規転写型遺伝子サイレンシング機構の解析

    2018年04月 - 2022年03月

    文部科学省  科学研究費助成事業 基盤研究(C) 

    池田 陽子

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    担当区分:研究代表者  資金種別:競争的資金

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  • レトロトランスポゾン転写制御機構の解析

    2015年04月 - 2018年03月

    文部科学省  科学研究費助成事業 若手研究(B) 

    池田 陽子

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    担当区分:研究代表者  資金種別:競争的資金

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  • 組織特異的なヘテロクロマチンサイレンシングに関わる新規因子の解析

    2014年04月 - 2015年03月

    文部科学省  科学研究費助成事業 研究活動スタート支援 

    池田 陽子

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    担当区分:研究代表者  資金種別:競争的資金

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担当授業科目

  • 情報伝達機構解析学演習 (2023年度) 前期  - その他

  • 情報伝達機構解析学演習 (2023年度) 後期  - その他

  • 情報伝達機構解析学演習 (2023年度) 後期  - その他

  • 情報伝達機構解析学演習 (2023年度) 後期  - その他

  • 情報伝達機構解析学演習 (2023年度) 前期  - その他

  • 情報伝達機構解析学演習 (2023年度) 前期  - その他

  • 情報伝達機構解析学特別演習 (2023年度) 通年  - その他

  • 植物エピゲノム解析学 (2023年度) 前期  - その他

  • 植物エピゲノム解析学 (2023年度) 前期  - その他

  • 植物生理学1 (2023年度) 第3学期  - 金1,金2

  • 植物生理学2 (2023年度) 第4学期  - 金1,金2

  • 特別研究 (2023年度) その他  - その他

  • 環境応答システム学 (2023年度) 後期  - 火5~8

  • 環境応答システム学 (2023年度) 後期  - 火5~8

  • 生物資源科学特別研究 (2023年度) 通年  - その他

  • 情報伝達機構解析学演習 (2022年度) 前期  - その他

  • 情報伝達機構解析学演習 (2022年度) 後期  - その他

  • 情報伝達機構解析学演習 (2022年度) 後期  - その他

  • 情報伝達機構解析学演習 (2022年度) 前期  - その他

  • 植物エピゲノム解析学 (2022年度) 前期  - その他

  • 植物生理学1 (2022年度) 第3学期  - 金1,金2

  • 環境応答システム学 (2022年度) 後期  - 火5~8

  • 生物資源科学特別研究 (2022年度) 通年  - その他

  • 情報伝達機構解析学演習 (2021年度) 前期  - その他

  • 情報伝達機構解析学演習 (2021年度) 後期  - その他

  • 情報伝達機構解析学演習 (2021年度) 後期  - その他

  • 情報伝達機構解析学演習 (2021年度) 前期  - その他

  • 植物エピゲノム解析学 (2021年度) 前期  - その他

  • 植物生理学1 (2021年度) 第3学期  - 金1,金2

  • 環境応答システム学 (2021年度) 後期  - 火5~8

  • 生物資源科学特別研究 (2021年度) 通年  - その他

  • 情報伝達機構解析学演習 (2020年度) 前期  - その他

  • 情報伝達機構解析学演習 (2020年度) 後期  - その他

  • 情報伝達機構解析学演習 (2020年度) 後期  - その他

  • 情報伝達機構解析学演習 (2020年度) 前期  - その他

  • 植物エピゲノム解析学 (2020年度) 特別  - その他

  • 環境応答システム学 (2020年度) 後期  - その他

  • 生物資源科学特別研究 (2020年度) 通年  - その他

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