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SAKAYAMA HidetoshiGraduate School of Science / Division of BiologyAssociate Professor
Research activity information
■ Award■ Paper
- Dec. 2024, Journal of Asia-Pacific Biodiversity, 17, 712 - 721, English, International magazineTaxonomy, new distribution, and DNA barcoding of the rare alga Chara altaica (Charales, Charophyceae) in Japan[Refereed]Scientific journal
- Oct. 2024, Phycologia, 63, 480 - 489, English, International magazineTaxonomy, morphology and phylogenetic placement of a new species Nitella pluripapillifera sp. nov. (Charales, Charophyta) from Japan[Refereed]
- Oct. 2023, The Journal of Japanese Botany, 98, 247 - 253, English, International magazine[Refereed]Scientific journal
- May 2023, Algal Resources, 16, 17 - 22, JapaneseBasic biology of charophyte green algae: focusing on the evolution of morphologies and genomes[Invited]Scientific journal
- Informa UK Limited, May 2022, Phycologia, 61(4) (4), 425 - 435, English, International magazine[Refereed]Scientific journal
- Mar. 2022, 藻類, 70, 29 - 37, Japanese, Domestic magazine絶滅のおそれのある野生生物の選定・評価検討 —レッドリスト2020藻類—[Refereed]Scientific journal
- Cytoplasmic streaming with extremely high velocity (∼70 μm s-1) occurs in cells of the characean algae (Chara). Because cytoplasmic streaming is caused by myosin XI, it has been suggested that a myosin XI with a velocity of 70 μm s-1, the fastest myosin measured so far, exists in Chara cells. However, the velocity of the previously cloned Chara corallina myosin XI (CcXI) was about 20 μm s-1, one-third of the cytoplasmic streaming velocity in Chara Recently, the genome sequence of Chara braunii has been published, revealing that this alga has four myosin XI genes. We cloned these four myosin XI (CbXI-1, 2, 3, and 4) and measured their velocities. While the velocities of CbXI-3 and CbXI-4 motor domains (MDs) were similar to that of CcXI MD, the velocities of CbXI-1 and CbXI-2 MDs were 3.2 times and 2.8 times faster than that of CcXI MD, respectively. The velocity of chimeric CbXI-1, a functional, full-length CbXI-1 construct, was 60 μm s-1 These results suggest that CbXI-1 and CbXI-2 would be the main contributors to cytoplasmic streaming in Chara cells and show that these myosins are ultrafast myosins with a velocity 10 times faster than fast skeletal muscle myosins in animals. We also report an atomic structure (2.8-Å resolution) of myosin XI using X-ray crystallography. Based on this crystal structure and the recently published cryo-electron microscopy structure of acto-myosin XI at low resolution (4.3-Å), it appears that the actin-binding region contributes to the fast movement of Chara myosin XI. Mutation experiments of actin-binding surface loops support this hypothesis.Feb. 2022, Proceedings of the National Academy of Sciences of the United States of America, 119(8) (8), English, International magazine[Refereed]Scientific journal
- Cold Spring Harbor Laboratory, May 2021, English
Abstract Cytoplasmic streaming with extremely high velocity (~70 μm s−1) occurs in cells of the characean algae (Chara ). Because cytoplasmic streaming is caused by organelle-associated myosin XI sliding along actin filaments, it has been suggested that a myosin XI, which has a velocity of 70 μm s−1, the fastest myosin measured so far, exists inChara cells. However, the previously clonedChara corallina myosin XI (Cc XI) moved actin filaments at a velocity of around 20 μm s−1, suggesting that an unknown myosin XI with a velocity of 70 μm s−1 may be present inChara . Recently, the genome sequence ofChara braunii has been published, revealing that this alga has four myosin XI genes. In the work reported in this paper, we cloned these four myosin XIs (Cb XI-1, 2, 3, and 4) and measured their velocities. While the velocities ofCb XI-3 andCb XI-4 were similar to that ofCc XI, the velocities ofCb XI-1 andCb XI-2 were estimated to be 73 and 66 μm s−1, respectively, suggesting thatCb XI-1 andCb XI-2 are the main contributors to cytoplasmic streaming inChara cells and showing thatCb XI-1 is the fastest myosin yet found. We also report the first atomic structure (2.8 Å resolution) of myosin XI using X-ray crystallography. Based on this crystal structure and the recently published cryo-EM structure of acto-myosin XI at low resolution (4.3 Å), it appears that the actin-binding region contributes to the fast movement ofChara myosin XI. Mutation experiments of actin-binding surface loop 2 support this hypothesis.Significance statement It has been suggested for more than 50 years that the fastest myosin in the biological world, with a velocity of 70 μm s−1, exists in the algaChara because cytoplasmic streaming with a velocity of 70 μm s−1 occurs inChara cells. However, a myosin with that velocity has not yet been identified. In this work, we succeeded in cloning a myosin XI with a velocity of 73 μm s−1, the fastest myosin so far measured. We also successfully crystallized myosin XI for the first time. Structural analyses and mutation experiments suggest that the central regions that define the fast movement ofChara myosin XI are the actin-binding sites. - Mar. 2021, Journal of Asia-Pacific Biodiversity, 14, 15 - 22, English, International magazineNew distributional records, taxonomy, morphology, and genetic variations of the endangered brackish-water species Lamprothamnium succinctum (Charales, Charophyceae) in Japan[Refereed]Scientific journal
- Wiley, Oct. 2020, Phycological Research, 68(4) (4), 263 - 268, English, International magazine[Refereed]Scientific journal
- Springer Science and Business Media LLC, Dec. 2018, Nature Communications, 9(1) (1), 5283, English, International magazine, Co-authored internationally[Refereed]Scientific journal
- Corresponding, Jul. 2018, Cell, 174(2) (2), 448 - 464.e24, English, International magazine, Co-authored internationally[Refereed]Scientific journal
- Last, 2017, FOTTEA, 17(2) (2), 222 - 239, English, International magazine, Co-authored internationally[Refereed]Scientific journal
- Dec. 2016, SCIENTIFIC REPORTS, 6, 39232, English, International magazine[Refereed]Scientific journal
- Sep. 2016, JOURNAL OF PLANT RESEARCH, 129(5) (5), 853 - 862, English, International magazine[Refereed]Scientific journal
- Jul. 2016, PLOS ONE, 11(7) (7), e0158944, English, International magazine[Refereed]Scientific journal
- Jun. 2016, CURRENT BIOLOGY, 26(12) (12), 1622 - 1628, English, International magazine, Co-authored internationally[Refereed]Scientific journal
- Feb. 2016, Knowledge and management of aquatic ecosystems, 417, 12, English, International magazineReconstruction of the former charophyte community out of the oospores identified in Lake Shinji sediments[Refereed]Scientific journal
- Jul. 2015, PHYCOLOGICAL RESEARCH, 63(3) (3), 159 - 166, English, International magazine[Refereed]Scientific journal
- Last, Jul. 2014, PHYCOLOGICAL RESEARCH, 62(3) (3), 222 - 227, English, International magazine[Refereed]Scientific journal
- Jul. 2014, PHYCOLOGICAL RESEARCH, 62(3) (3), 214 - 221, English, International magazine[Refereed]Scientific journal
- Nov. 2013, Plant Physiology, 163(4) (4), 1510 - 1517, English, International magazine, Co-authored internationallyCharacterization of heterotrimeric G-protein complex and its regulator from the green alga Chara braunii expands the evolutionarily breadth of plant G-protein signaling[Refereed]Scientific journal
- Aug. 2013, Journal of Experimental Botany, 64(18) (18), 5553 - 5568, English, International magazine, Co-authored internationallyMolecular and biochemical analysis of the first ARA6 homologue, a RAB5 GTPase, from green algae[Refereed]Scientific journal
- Springer Science and Business Media LLC, Dec. 2011, BMC Research Notes, 4(1) (1), English[Refereed]Scientific journal
- 2011, Journal of Phycology, 47(5) (5), English, International magazine[Refereed]Scientific journal
- Jun. 2010, CYTOLOGIA, 75(2) (2), 211 - 220, English, International magazineMorphology and Molecular Phylogeny of Chara altaica (Charales, Charophyceae), a Monoecious Species of the Section Desvauxia[Refereed]Scientific journal
- Aug. 2009, JOURNAL OF PHYCOLOGY, 45(4) (4), 917 - 927, English, International magazine, Co-authored internationally[Refereed]Scientific journal
- Sep. 2008, PHYCOLOGICAL RESEARCH, 56(3) (3), 202 - 215, English, International magazine[Refereed][Invited]Scientific journal
- Mar. 2008, PHYCOLOGIA, 47(2) (2), 191 - 202, English, International magazineMorphological variation and intraspecific phylogeny of the ubiquitous species Chara braunii (Charales, Charophyceae) in Japan[Refereed]Scientific journal
- Mar. 2007, PHYCOLOGIA, 46(2) (2), 160 - 167, English, International magazine[Refereed]Scientific journal
- 2007, PLANT AND CELL PHYSIOLOGY, 48, S94 - S94, EnglishIntroductory course in life science experiments at the University of Tokyo: Development of unique program for natural sciences
- Dec. 2006, ZOOLOGICAL SCIENCE, 23(12) (12), 1228 - 1228, EnglishIntroductory course in laboratory experiments (basic life sciences) at the University of Tokyo: Developing a new curriculum
- Jul. 2006, PHYCOLOGIA, 45(4) (4), 417 - 421, English, International magazine[Refereed]Scientific journal
- Feb. 2005, JOURNAL OF PHYCOLOGY, 41(1) (1), 195 - 211, English, International magazine[Refereed]Scientific journal
- Nov. 2004, PHYCOLOGIA, 43(6) (6), 672 - 681, English, International magazinePhylogenetic analyses of Nitella subgenus Tieffallenia (Charales, Charophyceae) using nuclear ribosomal DNA internal transcribed spacer sequences[Refereed]Scientific journal
- 2004, 環境科学総合研究所年報, 23, 95 - 99, Japanese車軸藻類の分子同定システムの構築Research institution
- Jan. 2004, PHYCOLOGIA, 43(1) (1), 91 - 104, English, International magazineTaxonomic re-examination of six species of Nitella (Charales, Charophyceae) from Asia, and phylogenetic relationships within the genus based on rbcL and atpB gene sequences[Refereed]Scientific journal
- 2003, Natural History Research, 7, 101 - 105, EnglishChara species that emerged from 40-years-old sediments from Lake Teganuma, central Japan[Refereed]Scientific journal
- Jul. 2002, PHYCOLOGIA, 41(4) (4), 397 - 408, English, International magazineTaxonomic re-examination of Nitella (Charales, Charophyceae) from Japan, based on microscopical studies of oospore wall ornamentation and rbcL gene sequences[Refereed]Scientific journal
- 2000, 山形大学理学部裏磐梯湖沼実験所報, 8, 18 - 35, Japanese福島県裏磐梯高原湖沼群に生育するシャジクモ目藻類(緑色植物)リストResearch institution
- 1999, 山形大学理学部裏磐梯湖沼実験所報, 7, 3 - 23, Japanese福島県裏磐梯高原湖沼群におけるシャジクモ類および沈水維管束植物の分布と生育状況Research institution
- 2018, ライフサイエンス新着論文レビュー, Japaneseシャジクモのゲノムの解読が明かす陸上植物への道および独自の進化Introduction commerce magazine
- Nov. 2017, JOURNAL OF PLANT RESEARCH, 130(6) (6), 1097 - 1097, EnglishOthers
- Lead, Jun. 2017, 海洋と生物, 230, 229–234, Japaneseシャジクモ類の和名について[Invited]Introduction commerce magazine
- 11 Mar. 2016, 日本植物生理学会年会要旨集, 57th, 178, EnglishEvolutional analysis of phosphate transport mechanism in plant cells.
- Lead, エヌ・ティー・エス, Jan. 2013, 遺伝, 67(1) (1), 31–38 - 38, Japanese植物の陸上化–陸上植物の姉妹群シャジクモから見えてくるもの[Invited]Introduction scientific journal
- Lead, 2010, BSJ-Review, 1: 30–35, Japanese植物の上陸作戦=シャジクモの辿った道[Invited]Introduction scientific journal
- Jul. 2009, PHYCOLOGIA, 48(4) (4), 57 - 57, EnglishNATURAL SELECTION OF CHLOROPLAST DNA ACTING IN THE INCIPIENT SPECIATION OF CHARA BRAUNIISummary international conference
- Jul. 2009, PHYCOLOGIA, 48(4) (4), 35 - 35, EnglishNITELLA SUBGENUS TIEFFALLENIA AND SUBGENUS HYELLA: PHYLOGENY BASED ON rbcL GENE SEQUENCES AND OOSPORE MORPHOLOGYSummary international conference
- Jul. 2009, PHYCOLOGIA, 48(4) (4), 114 - 115, EnglishTAXONOMIC REVISION OF CHARA FIBROSA (CHARALES, CHAROPHYCEAE) FROM THE WESTERN PACIFIC BASED ON OOSPORE MORPHOLOGY AND CHLOROPLAST DNA PHYLOGENYSummary international conference
- Lead, 2009, Biophilia, 5: 69-72, Japanese陸上植物の祖先「シャジクモ藻類」の進化学−水中から陸上へのストーリー[Invited]Introduction scientific journal
- May 2008, PHYCOLOGIA, 47(3) (3), 334 - 334, EnglishOthers
- Dec. 2007, JOURNAL OF PHYCOLOGY, 43, 48 - 48, EnglishAnalyses of the ubiquitous species Chara braunii (Charales) in Japan, based on the morphology, chloroplast and nuclear DNA sequencesSummary international conference
- 2007, PLANT AND CELL PHYSIOLOGY, 48, S255 - S255, EnglishIntroductory course in life science experiments at the University of Tokyo: Development of experimental items and DVD materialsSummary international conference
- 01 Dec. 2006, Journal of plant research, 119, 23 - 23, EnglishTaxonomy and ecology of charalean green algae
- Apr. 2005, JOURNAL OF PHYCOLOGY, 41(2) (2), 447 - 447, EnglishOthers
- Yamagata University, Mar. 2005, 山形大学理学部裏磐梯湖沼実験所報, 12, 26 - 41, EnglishTaxonomic reexamination of 17 species of Nitella subgenus Tieffallenia (Charales, Charophyceae) based on internal morphology of the oospore wall and multiple DNA marker sequences
- Yamagata University, Mar. 2005, 山形大学理学部裏磐梯湖沼実験所報, 12, 42 - 43, EnglishTaxonomic significance of internal morphology of the oospore wall in the genus Nitella (Charales, Charophyceae)
- Taxonomic re-examination of six species of Nitella (Charales, Charophyceae) from Asia, and phylogenetic relationships within the genus based on rbcL and atpB gene sequencesSix taxa of Nitella (Charales, Charophyceae), collected from Asia, were investigated using light and scanning electron microscopy (SEM) for the oospores, and sequencing of the gene encoding the large subunit of Rubisco (rbcL), in order to improve our understanding of their taxonomic status. Our SEM observations demonstrated that the oospore morphology of four taxa belonging to the subgenus Tieffallenia [N.megaspora (J.Groves) Sakayama, comb. nov. (= N.pseudoflabellata f.megaspora), N.tumulosa (= N.furcata f.tumulosa), N.gracillima (= N.gracilis f.gracillima) and N.axilliformis (= N.transluc...山形大学, Mar. 2004, 山形大学理学部裏磐梯湖沼実験所報, 11, 24 - 37
- Taxonomic re-examination of Nitella (Charales, Charophyceae) from Japan, based on microscopical studies of oospore wall ornamentation and rbcL gene sequencesNine taxa of Nitella (Charales, Charophyceae) from Japan, including five Japanese or east Asian endemics, were examined to improve understanding of their taxonomic status. The approaches used were light and scanning electron microscopy (SEM) of the oospores and sequencing of the gene (rbcL) encoding the large subunit of Rubisco. The species delineated were N.pulchella (= N.dualis f.pulchella), N.furcata, N.inversa (= N.furcata f.inversa), N.gracilens (= N.furcata f.gracilens), N.pseudoflabellata, N.hyalina, N.spiciformis (= N.gracilis f.spiciformis), N.moriokae (= N.rigida f.moriokae) and N...Yamagata University, Mar. 2003, 山形大学理学部裏磐梯湖沼実験所報, 10, 13 - 24, English
- Yamagata University, Mar. 2003, 山形大学理学部裏磐梯湖沼実験所報, 10, 11 - 11, EnglishFurther taxonomic study of Nitella (Charales, Charophyceae) from East Asia, based on SEM oospore morphology and molecular phylogenetics
- Yamagata University, Mar. 2002, 山形大学理学部裏磐梯湖沼実験所報, 9, 11 - 11, EnglishTaxonomic reexamination of Japanese charales (charophyceae, chlorophyta): a combined analysis of sem observation of the oospore ornamentation and molecular phylogenetic analysis based on rbcL gene sequences
- Yamagata University, Mar. 2002, 山形大学理学部裏磐梯湖沼実験所報, 9, 12 - 12, EnglishTaxonomic studies of Japanese charophytes based on the oospore wall ornamentation and molecular phylogeny
- 山形大学, Mar. 2002, 山形大学理学部裏磐梯湖沼実験所報, 9, 13 - 13, Japanese日本産シャジクモ目の卵胞子の走査電子顕微鏡観察
- 山形大学, Mar. 2001, 山形大学理学部裏磐梯湖沼実験所報, 8, 42 - 42, Japanese東北・北海道地方におけるシャジクモ類の生育分布
- 山形大学, Mar. 2001, 山形大学理学部裏磐梯湖沼実験所報, 8, 44 - 44, Japanese日本産シャジクモ目藻類の生育・分布と分子系統学的研究
- 10 Mar. 1999, 藻類, 47(1) (1), 87 - 87, Japanese山形県下の湖沼群における車軸藻類の分布と生育状況
- Contributor, 環境省, Mar. 2025, Japaneseシャジクモ科. 第5次レッドデータブック:絶滅のおそれのある日本の野生生物 藻類 (環境省編)
- Contributor, 朝倉書店, May 2023, 298-303, Japanese, ISBN: 9784254171815ストレプト植物における多細胞体制進化.原生生物学事典.[Refereed]Scholarly book
- Contributor, 鳥取県生活環境部緑豊かな自然課, Mar. 2023, 216–221, Japanese車軸藻類.レッドデータブックとっとり第3版2022 −鳥取県の絶滅のおそれのある野生動植物−
- Contributor, 創元社, Sep. 2022, 214–219, Japanese藻類.さらに知っておきたい日本の絶滅危惧植物図鑑General book
- Single work, 北隆館, 2017シャジクモ科.新分類 牧野日本植物図鑑Scholarly book
- Others, 京都府自然環境保全課, Apr. 2015, Japanese車軸藻類.京都府レッドデータブック 2015 第2巻 (野生植物・菌類編)Scholarly book
- Contributor, ぎょうせい, Feb. 2015, Japaneseシャジクモ科. レッドデータブック2014 –日本の絶滅のおそれのある野生生物–, 植物II (蘚苔類,藻類,地衣類,菌類) (環境省編)Scholarly book
- Single work, NTS, Jul. 2012, Japaneseレッドリストに載ったシャジクモ目藻類. 藻類ハンドブック[Refereed]Scholarly book
- Single work, NTS, Jul. 2012, Japaneseシャジクモ藻類(シャジクモ目).藻類ハンドブック[Refereed]Scholarly book
- Others, 鳥取県生活環境部公園自然課, 2012, Japaneseレッドデータブックとっとり改訂版 −鳥取県の絶滅のおそれのある野生動植物−Scholarly book
- Single work, 東京大学出版, 2010, Japanese図説生物学Textbook
- Contributor, 環境省自然環境局野生生物課, 2010, Japanese改訂レッドリスト付属説明資料. 藻類Scholarly book
- Contributor, 東京大学出版会, 2009基礎生命科学実験、第2版(DVDつき,東京大学教養学部基礎生命科学実験編集委員会編)
- Single work, 北隆館, 2008シャジクモ科.牧野新日本植物図鑑
- Contributor, 東京大学出版会, 2007基礎生命科学実験(DVDつき,東京大学教養学部基礎生命科学実験編集委員会編)
- 山形県文化環境部環境保護課, 2004山形県で確認された車軸藻類.レッドデータブックやまがた 絶滅危惧野生植物-維管束植物-(山形県野生植物調査研究会編)
- 日本藻類学会第49回大会, Mar. 2025, Japanese, 琉球大学(那覇), Japan, Domestic conference沖縄県から発見されたシャジクモ類の新種トゲマリフラスコモの形態,系統,分類Oral presentation
- 日本藻類学会第49回大会, Mar. 2025, Japanese, 琉球大学(那覇), Japan, Domestic conferenceシャジクモ藻類シャジクモにおける卵胞子発芽に関する研究Poster presentation
- 日本植物分類学会第24回大会, Mar. 2025, Japanese, 高知大学(高知), Japan, Domestic conference気生藻類スミレモ類の日本新産種Trentepohlia dialeptaの分類と系統Poster presentation
- 日本植物学会第88回大会, Sep. 2024, Japanese, 宇都宮大学(宇都宮), Japan, Domestic conferenceシャジクモの形質転換系確立に向けての条件検討Poster presentation
- 日本藻類学会第48回大会, Mar. 2024, Japanese, 神戸大学(神戸), Japan, Domestic conference日本における気生藻類スミレモ類の分類と系統に関する研究:日本新産種Trentepohlia dialeptaを中心にPoster presentation
- 日本植物生理学会第58回年会, Mar. 2024, Japanese, 神戸国際会議場(神戸), Japan, Domestic conference, Co-authored internationallyシャジクモ(Chara braunii)細胞膜Na+共役型リン酸輸送体分子の機能解析Oral presentation
- 日本植物学会第87回大会, Sep. 2023, Japanese, 北海道大学(札幌), Japan, Domestic conferenceストレプト藻類研究の魅力:シャジクモ,アオミドロを中心に[Invited]Invited oral presentation
- The 33rd International Conference on Arabidopsis Research (ICAR2023), Jun. 2023, English, Makuhari Messe, Chiba, Japan, International conferenceStructure and regulation of Arabidopsis Myosin XI, MYA2Poster presentation
- 日本藻類学会第47回大会, Mar. 2023, Japanese, オンライン開催(札幌), Japan, Domestic conference新規培養株で明らかとなった接合藻類ホシミドロ類及びヒザオリ類の系統関係Poster presentation
- 日本植物生理学会第57回年会, Mar. 2023, Japanese, 東北大学(仙台), Japan, Domestic conference多細胞性接合藻アオミドロ属Spirogyra parvulaゲノムの解読と単細胞性接合藻および陸上植物との比較解析Oral presentation
- 日本植物分類学会第22回大会, Mar. 2023, Japanese, 千葉大学(千葉), Domestic conferenceアオミドロ属Spirogyra parvulaのゲノム解析から探る接合藻類単細胞化と遺伝子喪失Oral presentation
- 日本植物分類学会第22回大会, Mar. 2023, Japanese, 千葉大学(千葉), Japan, Domestic conference接合藻類ヒザオリ類ムウゲオチエラ属(Mougeotiella)の1種の接合形態と系統的位置Poster presentation
- 日本植物学会第86回大会, Sep. 2022, Japanese, 京都府立大学(京都), Domestic conference新規培養株と接合誘導を用いたホシミドロ類及びヒザオリ類の系統分類学的研究
- 日本植物学会第86回大会, Sep. 2022, Japanese, 京都府立大学(京都), Japan, Domestic conference多細胞性接合藻類アオミドロのゲノム解読Oral presentation
- 日本植物学会第86回大会, Sep. 2022, Japanese, 京都府立大学(京都), Japan, Domestic conference生物界最速のChara braunii (シャジクモ) のミオシンXIの発見Poster presentation
- 日本応用藻類学会第20回記念大会, Sep. 2022, Japanese, 宮城大学(仙台), Japan, Domestic conference淡水緑藻シャジクモ藻類の基礎生物学[Invited]Invited oral presentation
- 日本藻類学会第46回大会, Mar. 2022, Japaneseアオミドロ類(ストレプト植物門・ホシミドロ藻綱)の葉緑体ゲノム解読に基づく分子系統解析及び一未記載種Poster presentation
- 日本植物分類学会第21回大会, Mar. 2022, Japanese日本産アオミドロ類(ストレプト植物門・ホシミドロ藻綱)の形態比較及び分子系統解析Poster presentation
- 日本植物学会第85回大会, Sep. 2021, Japanese, 東京都立大学(オンライン大会、八王子), Japan, Domestic conferenceアオミドロ類(接合藻類ストレプト植物門)の接合形態比較及び分子系統解析
- 日本植物学会第85回大会, Sep. 2021, Japanese, 東京都立大学(オンライン大会、八王子), Japan, Domestic conference, Co-authored internationallyストレプト植物RAF様キナーゼの機能解析Oral presentation
- 日本藻類学会第45回大会, Mar. 2021, Japanese, オンライン開催(東京), Japan, Domestic conference兵庫県及び京都府から発見された接合藻類アオミドロ属における一未記載種Oral presentation
- 日本植物分類学会第20回大会, Mar. 2021, Japanese, オンライン開催(東京), Japan, Domestic conference新規培養株を用いた接合藻類アオミドロ属及びシロゴニウム属の分子系統と形態比較Oral presentation
- 日本植物学会第84回大会, Sep. 2020, Japanese, Domestic conference, Co-authored internationally車軸藻類Nitella sonderiとその近縁種の分類学的再検討Poster presentation
- 日本植物学会第84回大会, Sep. 2020, Japanese接合藻類アオミドロ属の日本新産種Spirogyra unduliseptumの分類学的再検討Poster presentation
- 日本植物生理学会第61回年会, Mar. 2020, Japanese, 大阪大学(吹田キャンパス), Japan, Domestic conferenceプラスチドシグナルとGUN1機能の進化Oral presentation
- 日本藻類学会第44回大会, Mar. 2020, Japanese, 鹿児島大学(鹿児島), Japan, Domestic conference接合藻類アオミドロ属の新規培養株についての形態観察及び系統解析Poster presentation
- 日本植物分類学会第19回大会, Feb. 2020, Japanese, 岐阜大学(岐阜), Japan, Domestic conference接合藻類アオミドロ属の日本新産種における細胞間隔壁の特徴と系統的位置Poster presentation
- 日本植物学会第83回大会, Sep. 2019, Japanese, 東北大学(仙台), Japan, Domestic conference, Co-authored internationally車軸藻類シャジクモ(Chara braunii)とその近縁種の分類学的再検討Poster presentation
- 日本植物学会第83回大会, Sep. 2019, Japanese, 東北大学(仙台), Domestic conference接合藻類アオミドロ属の西日本産を中心とした新規株の系統解析Oral presentation
- The 5th International Volvox Conference, Jul. 2019, English, Tokyo, Japan, International conferenceFirst discovery of heterothallic sexuality in the genus Spirogyra using culture strainsOral presentation
- The 5th International Volvox Conference, Jul. 2019, English, Tokyo, Japan, International conferenceThe genome and ecological evolution of Chara braunii (Charophyceae, Streptophyta)Poster presentation
- 日本藻類学会第43回大会, Mar. 2019, Japanese, 京都大学, Domestic conference, Co-authored internationallyシャジクモ(Chara)属 Charopsis 節の分類学的再検討Poster presentation
- Plant and Animal Genome XXVII Conference, Jan. 2019, English, San Diego, USA, International conferenceProgress in Streptophyte Algae Genomics and Genetics.Oral presentation
- East Asian Plant Diversity and Conservation 2018, Oct. 2018, English, Hangzhou, China, International conferenceThe genome and ecological evolution of a cosmopolitan freshwater alga Chara braunii (Charales, Streptophyta).Poster presentation
- 日本植物学会第82回大会, Sep. 2018, Japanese, 広島国際会議場, Domestic conferenceシャジクモ細胞膜リン酸輸送体の分子機能解析Oral presentation
- 日本植物学会第82回大会, Sep. 2018, Japanese, 広島国際会議場, Domestic conferenceNIMA関連キナーゼファミリーによる細胞伸長制御の進化的な保存性Oral presentation
- 日本植物分類学会第17回大会, Mar. 2018, Japanese, 金沢歌劇座(金沢), Domestic conference分離集団の薄いショットガンシーケンシングによるシャジクモ遺伝学的地図の構築Poster presentation
- 日本植物分類学会第17回大会, Mar. 2018, Japanese, 金沢歌劇座(金沢), Domestic conference培養株を用いたシャジクモの種内系統と生態型の遺伝的基盤に関する研究Poster presentation
- 第65回日本生態学会大会, Mar. 2018, Japanese, 札幌コンベンションセンター(札幌), Domestic conference西表島の淡水湿地林における着生植物オオタニワタリの空間分布Poster presentation
- 日本藻類学会第42回大会, Mar. 2018, Japanese, 東北大学, Domestic conferenceシャジクモ藻類シャジクモにおけるLEAFY遺伝子ホモログの発現・機能解析Poster presentation
- 65th NIBB Conference Marchantia Workshop 2017, Renaissance of Marchantia polymorpha -the genome and beyond-, Dec. 2017, English, Okazaki, Japan, International conferenceThe genome and ecological evolution of a charalean alga Chara braunii[Invited]Invited oral presentation
- 65th NIBB Conference Marchantia Workshop 2017, Renaissance of Marchantia polymorpha -the genome and beyond-, Dec. 2017, English, Okazaki, Japan, International conferenceGenetic map construction with low depth segregant sequencing in Chara brauniiPoster presentation
- 日本植物学会第81回大会, Sep. 2017, Japanese, 東京理科大(野田), Domestic conference, Co-authored internationally緑色植物の活性酸素生成酵素NADPH oxidase/Rbohの分子進化におけるCa2+依存的活性制御機構の獲得起源Oral presentation
- 日本植物学会第81回大会, Sep. 2017, Japanese, 東京理科大(野田), Domestic conference高速化ミオシンXI導入による単子葉植物ブラキポディウムの表現型解析Oral presentation
- 第58回日本植物生理学会年会, Mar. 2017, Japanese, 鹿児島大学, Domestic conference分離集団の薄いショットガンシーケンシングによるシャジクモ遺伝学的地図の構築Poster presentation
- 日本藻類学会第41回大会, Mar. 2017, Japanese, 高知大学, Domestic conference富士五湖における最近の車軸藻類の分布状況Poster presentation
- 第58回日本植物生理学会年会, Mar. 2017, Japanese, 鹿児島大学, Domestic conference精子を持つ植物で見つかったアデニル酸シクラーゼPoster presentation
- 日本藻類学会第41回大会, Mar. 2017, Japanese, 高知大学, Domestic conferenceシャジクモの生態型の進化に関する研究Poster presentation
- Advanced Genome Science International Symposium, The Start of New Genomics, Jan. 2017, English, 伊藤国際学術研究センター, International conferenceDe novo sequencing of Chara braunii genome and construction of genetic mapPoster presentation
- 近畿植物学会講演会, Nov. 2016, Japanese, 兵庫県民会館, Domestic conference水草ヒルムシロ属の環境応答と種分化[Invited]Invited oral presentation
- 日本植物学会第80回大会, Sep. 2016, Japanese, 沖縄コンベンションセンター, Domestic conference速度改変型ミオシン XI 導入による単子葉植物ブラキポディウムの成長促進Poster presentation
- 日本植物学会第80回大会, Sep. 2016, Japanese, 沖縄コンベンションセンター, Domestic conference, Co-authored internationally藻類・陸上植物の細胞壁空間に ROS を産生する酵素 Rboh の分子進化Poster presentation
- 日本植物学会第80回大会, Sep. 2016, Japanese, 沖縄コンベンションセンター, Domestic conference生物界最速ミオシンである Chara braunii (シャジクモ)のミオシンXIの機能解析Poster presentation
- 日本植物学会第80回大会, Sep. 2016, Japanese, 沖縄コンベンションセンター, Domestic conferenceシャジクモの発生遺伝子の発現プロファイリングに関する研究Poster presentation
- 日本植物学会第80回大会, Sep. 2016, Japanese, 沖縄コンベンションセンター, Domestic conferenceシャジクモの生殖器官のトランスクリプ トーム解析[Invited]Invited oral presentation
- 7th International Research Group on Charophytes Symposium, Sep. 2016, English, Astana, Kazakhstan, International conferenceGenome and transcriptome of charophytesOral presentation
- 7th International Research Group on Charophytes Symposium, Sep. 2016, English, Astana, Kazakhstan, International conference, Co-authored internationallyCharophytes, origin of land plants and terminologyOral presentation
- ICAR 2016 International Conference on Arabidopsis Research, Jun. 2016, English, Gyeongju, Korea, International conferenceGenomes of bryophytes and charophyceansOral presentation
- EMBO Workshop, New model systems for early land plant evolution, Jun. 2016, English, Vienna, Austria, International conferenceGenome sequencing charophyceans, liverworts, and hornworts: making model systems[Invited]Invited oral presentation
- EMBO Workshop, New model systems for early land plant evolution, Jun. 2016, English, Vienna, Austria, International conferenceEvolutionary analyses on ecological differentiation of a cosmopolitan freshwater alga Chara braunii (Charales, Streptophyta)Poster presentation
- 日本藻類学会第40回大会, Mar. 2016, Japanese, Domestic conference, Co-authored internationally日本とオーストラリアから発見された車軸藻類シャジクモ属の新種の形態,系統,分類Poster presentation
- 日本生態学会第63回全国大会, Mar. 2016, Japanese, 仙台国際センター, Domestic conference水生植物の気孔形成と塩ストレス応答Poster presentation
- 第57回日本植物生理学会年会, Mar. 2016, Japanese, 日本植物生理学会, 岩手大学上田キャンパス, Domestic conference植物細胞リン酸輸送機構とその進化についてOral presentation
- (一社)日本植物生理学会第57回年会, Mar. 2016, Japanese, 盛岡, Domestic conferenceEvolutional analysis of phosphate transport mechanism in plant cellsOral presentation
- 平成27年度 近畿植物学会講演会, Nov. 2015, Japanese, 大阪市立大学理学部附属植物園, Domestic conference水生植物の異形葉形成と海水適応Poster presentation
- 日本植物学会第79回大会, Sep. 2015, Japanese, Domestic conferenceシャジクモの遺伝学的解析に向けた交配実験系の確立Oral presentation
- 第56回日本植物生理学会年会, Mar. 2015, Japanese, 東京農業大学, Domestic conference植物細胞リン酸輸送機構とその進化についてOral presentation
- 日本藻類学会第39回大会, Mar. 2015, Japanese, 九州大学箱崎キャンパス(福岡), Domestic conferenceシャジクモの遺伝地図構築に向けたジェノタイピングを用いた交配実験系の確立Poster presentation
- The 2nd International Symposium on Plant Environmental Sensing, Mar. 2015, English, AIST, Odaiba, International conferenceEvolutionary analysis of phosphate transport mechanisms in plant cellsPoster presentation
- International Plant & Animal Genome XXIII Conference, Jan. 2015, English, San Diego, USA, International conference, Co-authored internationallyThe Chara braunii genome sheds light on the origin of land plantsPoster presentation
- International Symposium on Genome Science 2015, Jan. 2015, English, Tokyo, Japan, International conference, Co-authored internationallyThe Chara braunii genomePoster presentation
- International Plant & Animal Genome XXIII Conference, Jan. 2015, English, San Diego, USA, International conferenceThe Chara braunii genome[Invited]Invited oral presentation
- Marchantia Workshop 2014, Dec. 2014, English, Kobe University, International conferenceEvolutional analysis of phosphate trasnport mechanism in plant cellsPoster presentation
- Marchantia Workshop 2014, Dec. 2014, English, Kobe, Japan, International conferenceDe novo assembly and analysis of RNA-seq data from charalean alga, Chara brauniiPoster presentation
- 日本植物学会第78回大会, Sep. 2014, Japanese, 明治大学 生田キャンパス, Domestic conference植物細胞リン酸輸送機構とその進化についてOral presentation
- 日本植物学会第78回大会, Sep. 2014, Japanese, 明治大学生田キャンパス(神奈川), Domestic conference再発見された絶滅種チュウゼンジフラスコモの形態、遺伝的多様性および分類Poster presentation
- 日本植物学会第76会大会, Sep. 2014, Japanese, 明治大学生田キャンパス(神奈川), Domestic conferenceシャジクモゲノムにみる陸上植物の制御因子ホモログ[Invited]Nominated symposium
- 日本進化学会第16回大会, Aug. 2014, Japanese, 高槻現代劇場(大阪), Domestic conference陸上植物に近縁な緑色藻類シャジクモのゲノム解読とアノテーションPoster presentation
- 第55回日本植物生理学会年会, Mar. 2014, Japanese, 富山大学五福キャンパス, Domestic conference植物細胞リン酸輸送機構とその進化についてOral presentation
- 第38回日本藻類学会, Mar. 2014, Japanese, 船橋, Domestic conference広島県宮島で見つかったフラスコモダマシ(車軸藻綱,シャジクモ目)の形態と系統Oral presentation
- 第38回日本藻類学会, Mar. 2014, Japanese, 船橋, Domestic conference愛媛県レッドデータブックに掲載予定の車軸藻類Oral presentation
- 日本植物分類学会第13回大会, Mar. 2014, Japanese, 熊本, Domestic conferenceシャジクモのゲノム解読Oral presentation
- 6th International meeting of the model brown alga Ectocarpus, Mar. 2014, English, Kobe, Japan,, International conferenceEvolutionary analyses on the two ecologically differentiated types of freshwater alga Chara braunii (Charales).Oral presentation
- Ectocarpus, Mar. 2014, English, Kobe, International conferenceDe novo assembly and analysis of RNA-seq data from charalean algae Chara brauniiOral presentation
- 第55回日本植物生理学会年会, Feb. 2014, Japanese, 富山, Domestic conference陸上植物に近縁な緑色藻類シャジクモのゲノム解読Oral presentation
- NGS現場の会・第三回研究会, Sep. 2013, Japanese, 神戸, Domestic conference陸上植物に近縁な緑色藻類シャジクモのゲノム解読Oral presentation
- 第37回日本藻類学会, Mar. 2013, Japanese, 甲府, Domestic conference愛媛県で確認されたシャジクモ属(Chara)についてOral presentation
- 日本藻類学会第37回大会, Mar. 2013, Japanese, 山梨大学, Domestic conferenceシャジクモ(Chara braunii)における EST-SSR マーカーの開発Oral presentation
- 第37回日本藻類学会, Mar. 2013, Japanese, 甲府, Domestic conferenceシャジクモ藻類シャジクモ(Chara braunii)におけるLEAFY遺伝子ホモログの発現解析Oral presentation
- Ectocarpus, Mar. 2013, English, Kobe, International conferenceGenome sequencing of the charophycean green alga, Chara braunii.[Invited]Invited oral presentation
- 日本植物学会第76会大会, Sep. 2012, Japanese, 兵庫県立大学,姫路, Domestic conference絶滅危惧車軸藻類ホシツリモの新産地発見Poster presentation
- 水草研究会第34回大会, Aug. 2012, Japanese, 西条, Domestic conference日本産車軸藻類の分類と生育分布の現状Oral presentation
- 第36回日本藻類学会, Aug. 2012, Japanese, 札幌, Domestic conference沖縄本島における車軸藻類と淡水産大型紅藻類の産地報告Poster presentation
- 日本藻類学会第36回大会, Aug. 2012, Japanese, 札幌, Domestic conferenceシャジクモ藻類シャジクモ(Chara braunii)のRNA-seq解析Oral presentation
- 日本藻類学会第36回大会, Aug. 2012, Japanese, 札幌, Domestic conferenceシャジクモの保全遺伝学に向けたSSRマーカーの新規開発Poster presentation
- 日本藻類学会第36回大会, Jul. 2012, Japanese, 札幌, Domestic conference車軸藻類Chara fibrosa群の分子系統学的解析Oral presentation
- 日本藻類学会第36回大会, Jul. 2012, Japanese, 北海道大学, Domestic conferenceシャジクモ類の保全遺伝学に向けたSSRマーカーの新規開発Oral presentation
- SEB Meeting 2012, Jun. 2012, English, Salzburg, Austria, International conference, Co-authored internationallyCharacterization of the first ARA6 homolog, a Rab5 GTPase, from green algae possibly involved in wound healing.Oral presentation
- 第11回日本植物分類学会, Mar. 2012, Japanese, 大阪, Domestic conference長野県および千葉県に生育するシャジクモ属 (シャジクモ目、シャジクモ科) の未記載種についてPoster presentation
- 第53回日本植物生理学会年会, Mar. 2012, Japanese, 京都産業大学, Domestic conference次世代シーケンサーデータのde novoアセンブリー解析Invited oral presentation
- 第11回日本植物分類学会, Mar. 2012, Japanese, 大阪, Domestic conferenceオオシャジクモ種内(シャジクモ目シャジクモ科)の新規系統に関する分類学的研究Poster presentation
- 日本植物学会第76会大会, 2012, Japanese, 兵庫県立大学, Domestic conferenceゲノム解析から見たシャジクモ類の多細胞化進化[Invited]Nominated symposium
- The International Plant & Animal Genome XX Conference, Jan. 2012, English, San Diego, USA, International conferenceClosterium and Chara genome and transcriptome analysesInvited oral presentation
- 日本植物学会第75会大会, Sep. 2011, Japanese, 東京大学, Domestic conferenceシャジクモ藻類のゲノム解析の現状とシャジクモRNA-seq解析から探る陸上植物の進化[Invited]Nominated symposium
- 第33回水草研究会全国集会, Aug. 2011, Japanese, 群馬, Domestic conference絶滅危惧種の多様性情報学と域外保全技術開発に向けて~シャジクモ類を例に~Poster presentation
- 第33回水草研究会全国集会, Aug. 2011, Japanese, 群馬, Domestic conferenceシャジクモ(Chara braunii)に見られる生態的2型の進化生物学的解析Poster presentation
- 日本藻類学会第35回大会, Mar. 2011, Japanese, 日本藻類学会, 富山, Domestic conference車軸藻類フラスコモ属の系統分類学的解析Oral presentation
- 日本藻類学会第35回大会, Mar. 2011, Japanese, 富山, Domestic conference広範囲な分子系統解析は緑色系二次共生藻の光合成PRK遺伝子が緑色ではない藻類からの起源を示すOral presentation
- 日本植物分類学会第9回大会, Mar. 2010, Japanese, 日本植物分類学会, 愛知, Domestic conference埋土卵胞子由来のシャジクモから示唆された生態的2型間の接合前隔離Oral presentation
- 日本藻類学会第34回大会, Mar. 2010, Japanese, つくば, Domestic conference日本産シャジクモ科藻類の多様性情報データベース構築に向けてPoster presentation
- 日本藻類学会第34回大会, Mar. 2010, Japanese, つくば, Domestic conference日本におけるヒメフラスコモ類Nitella flexilis complex(Charales,Charophyceae)の遺伝的多様性と分類に関する研究Poster presentation
- 日本植物分類学会第9回大会, Mar. 2010, Japanese, 愛知, Domestic conference, Co-authored internationallyシャジクモ科藻類Nitella属の全系統関係の解明と新分類体系の構築に向けてPoster presentation
- 日本植物学会第73回大会, Sep. 2009, Japanese, 山形, Domestic conference植物の上陸作戦=シャジクモの辿った道[Invited]Nominated symposium
- 日本蘚苔類学会第38回大会, Aug. 2009, Japanese, 埼玉, Domestic conference遠縁の系統関係を解析するのに適した核マーカーの開発Oral presentation
- The 9th International Phycological Congress 2009, Aug. 2009, English, Tokyo, Japan, International conferenceTaxonomic revision of Chara fibrosa (Charales, Charophyceae) from the Western Pacific based on oospore morphology and chloroplast DNA phylogenyPoster presentation
- The 9th International Phycological Congress 2009, Aug. 2009, English, Tokyo, Japan, International conference, Co-authored internationallyNitella subgenus Tieffallenia and subgenus Hyella: phylogeny based on rbcL gene sequences and oospore morphologyPoster presentation
- The 9th International Phycological Congress 2009, Aug. 2009, English, Tokyo, Japan, International conferenceNatural selection of chloroplast DNA acting in the incipient speciation of Chara brauniiOral presentation
- 日本植物学会北陸支部平成21年度大会, Jun. 2009, Japanese, 金沢, Domestic conference遠縁の系統関係を解析するのに適した核マーカーの開発Oral presentation
- International Phycological Society
- International Research Group on Charophytes
- SOCIETY OF EVOLUTIONARY STUDIES
- THE ECOLOGICAL SOCIETY OF JAPAN
- JAPANESE SOCIETY FOR PLANT SYSTEMATICS
- THE BOTANICAL SOCIETY OF JAPAN
- THE JAPANESE SOCIETY OF PHYCOLOGY
- 日本学術振興会, 科学研究費助成事業, 基盤研究(C), 新潟大学, 01 Apr. 2023 - 31 Mar. 2026淡水藻類シャジクモの生態的2型における生態的種分化の実証的研究
- 公益財団法人旭硝子財団, 2021年度研究助成, Apr. 2021 - Mar. 2024, Principal investigator絶滅危惧種を多く含む大型淡水藻類の多様性情報データベース構築・域外保全と希少性・保全価値評価Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kanazawa University, Apr. 2021 - Mar. 2024Elucidation of last common ancestor of land plants based on meristem related genesシャジクモの概要ゲノム解読における遺伝子予測ではシャジクモはLEAFY遺伝子を1つ持つ(CbLFY1)と考えられていた。CbLFY1をクローニングする過程で概要ゲノム解読で予想された配列と異なるアイソフォーム(選択的スプライシングにより後半のエクソンが異なる)が見つかり、両方のアイソフォームの全長配列のクローニングを進めた。また、発生段階/細胞毎のqPCRを行い、発現パターンをRNA-seqの結果と比較した。
栄養生殖期のヒメミカヅキモから、YABBY遺伝子(CpYabby)をコードするcDNAの全長クローニングを行った。この遺伝子の機能を調べるために、ゲノム編集による遺伝子破壊用コンストラクトを作成した。このコンストラクトを用いて、ヒメミカヅキモのプラス型(NIES-67)およびマイナス型(NIES-68)株に形質転換を試みたところ、マイナス型株からは薬剤耐性株が取れたものの、プラス型株からは得られなかった。今後、プラス型株についてさらに標的部位を変えたコンストラクトを調製し、あらたに遺伝子破壊を目指す。得られた薬剤耐性株からCpYabby遺伝子を含むゲノム断片を単離し、破壊状況を確認し、有望な株について、クローン化と表現型解析を行う。
ナガサキツノゴケAnthoceros agrestisのYABBY遺伝子、LEAFY遺伝子の5’隣接領域を推定プロモーター候補領域としてクローニングし、ゲートウェイ技術を用いてゼニゴケ向けに開発されたプロモーターレポーター解析用のプラスミドに組み込んだコンストラクトを作成した。このコンストラクトをアグロバクテリウムを介してナガサキツノゴケに導入しプロモーターレポーター株を作出した。 - Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Challenging Research (Exploratory), Challenging Research (Exploratory), Kanazawa University, 28 Jun. 2019 - 31 Mar. 2022Reformation of evolutionary genomics in land plant evolution: from sequence comparison to functional comparison.シャジクモの薬剤耐性について再現性をとるとともに有効濃度をより詳細に調べ、G418 (Geneticin)、ハイグロマイシン、ゼオシンの致死濃度を調べた。半数致死量はG418については2mg/L以下、ハイグロマイシンについては5 mg/L前後、2 mg/L前後であると見られる結果を得た。生存を葉緑素の量で判定する場合の選抜期間としては1週間では不十分で2週間待つ方が良いことがわかった。また、プロモーター候補領域を繋いだプラスミドをパーティクルボンバーメント法で導入することで、βグルクロニダーゼ(GUS)活性をもたらすことも再現できた。この内生プロモーターにハイグロマイシン不活性化酵素のコード領域をつなぎさらに3'隣接領域をターミネーターとして繋いだ融合遺伝子を耐性遺伝子としてパーティクルボンバードメント法によりシャジクモ配偶体組織に導入する実験を行い、ハイグロマイシン処理したところ、一時的にハイグロマイシン耐性を獲得していると判断される結果を得た。しかしながら、そこから細胞分裂を誘導し完全な植物体を再生することはまだできていない。 コレオケーテについてColeochaete scutata CCAC 0493株のRNA-seqのデータをアセンブル解析し、EF1α遺伝子の転写産物候補を得た。今後この5'側隣接ゲノム領域を単離することによって、プロモーター候補が得られると期待される。また、日本の 栃木県 日光市 湯ノ湖 で採取されたとされる株NIES-4262についても培養を行った。
- 公益財団法人市村清新技術財団, 第30回植物研究助成, Apr. 2021 - Mar. 2022, Principal investigator伊豆地方を中心とした大型淡水藻類の多様性情報学的解析と保全Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2018 - 31 Mar. 2021, Principal investigatorIn this study, we examined two strains of Chara braunii, representing two ecotypes. We tried to obtain mutants by treating vegetative cells and oospores with ethylmethanesulfonate (EMS). A mutant with a phenotype of interest is obtained by screening thalli under a specific condition. We also obtained a mutant from long-term cultured material. We compared their phenotypic characteristics with wild type strains, and moved forward with mating experiments and genome analyses using mutant and wild type strains. In order to establish a gene introduction and stable expression system in Chara, moreover, we explored the developmental processes of thalli reproduced from stem cells of vegetative organs in detail, and tried to introduce the exogenous gene into Chara cells.Competitive research funding
- 公益財団法人市村清新技術財団, 第29回植物研究助成, Apr. 2020 - Mar. 2021, Principal investigator伊豆地方を中心とした大型淡水藻類の多様性情報学的解析と保全Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2016 - 31 Mar. 2020, Principal investigatorChara braunii is distributed worldwide, excluding Antarctica, grows in a variety of freshwater environments, and exhibits high morphological variability. The current distribution pattern of C. braunii is thought to be influenced mainly by dispersal by migratory waterfowl and the creation of secondary environments (e.g., rice fields and artificial ponds for irrigation) by rice farming that began mainly in East Asia, which has created new niches for this species. In C. braunii, however, the process of establishment of the current distribution pattern and the evolutionary process of regional variation, mainly in East Asia, have not been clarified. In this study, we collected C. braunii from overseas, mainly from East Asia, and analyzed the genetic diversity, phylogenetic relationships, and phenotypes within this species to clarify the establishment process of the current distribution pattern and diversity of C. braunii.Competitive research funding
- 公益財団法人市村清新技術財団, 第28回植物研究助成, Apr. 2019 - Mar. 2020, Principal investigator伊豆地方を中心とした大型淡水藻類の多様性情報学的解析と保全Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2015 - 31 Mar. 2018, Principal investigatorIn order to investigate the evolution of the multicellular body plan in land plants and charophycean algae, in this study, we compared their multicellular gametophyte and sporophyte generations based on their genes and genomes. We identified the developmental genes specifically expressed in different tissues/cells of C. braunii. Moreover, we explored the expression/function of these developmental genes in charalean algae in detail and discussed the evolution of the multicellular body plan in land plants and charophycean algae. We were also tried to introduce the exogenous gene into Chara cells using the native promoter of the Chara gene by microinjection and particle bombardment.Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Japan Women's University, 01 Apr. 2014 - 31 Mar. 2018Sex determining mechanism in streptophytes approached by the sex determining gene of Closterium peracerosum-strigosum-littorale complexThe CpMinus1 gene is a mt- genome-specific gene from the Closterium peracerosum-strigosum-littorale complex (C. psl. complex). We developed the CpMinus1-expressing mt+ transformants. They showed a weak sexual reaction without mating partners, like as the case of homothallic strains, but tended to form zygotes with mt+ strain but not with mt- strain. The gene expression profile was drastically changed to that of wild mt- strains. We also obtained CpMinus1-knockout mutants from mt- background. The gene expression profile was quite similar to that of wild mt+ cells. We concluded that the CpMinus1 gene was a master gene for the sex determination in C. psl. complex. On the other hand, we could not find the CpMinus2 gene, which would be tightly linked to the CpMinus1 in the genome. Through the Iso-seq data of sexual dimorphic Chara australis, two gene showing weak similarity to the CpMinus1 was found. One of them expressed only in the male strain, although the expression level was very low.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kanazawa University, 01 Apr. 2012 - 31 Mar. 2016Elucidation of Land plant evolution by draft genome sequencing and genetic map construction of Chara brauniiA draft genome sequence of Chara braunii was determined. Chara braunii is a relatively small monoeicous alga in Charales, which we can culture in lab condition and induce reproductive organs in a short time. The draft genome consisted of 1.75 Gbp in 11,808 scaffolds. Half of the sequence is contained in 234 scafolds at least 2.26 Mb long and 90% is contained in 813 scaffolds at least 551,793 bp long. Gene prediction using RNA-seq data and homology to plant proteomes resulted in 36,887 gene models in 35,883 loci. Further to establish the chromosome scale super scaffold, genetic cross between two accessions were performed. PCR-RFLP primers were designed based on SNP data and progeny derived from out-crossing were determined. Random sequencing of the progeny are performed to construct genetic map based superscaffolds.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2012 - 31 Mar. 2015, Principal investigatorIn order to investigate the origin and evolution of the multicellular body plan in land plants and charophycean algae, in this study, we compared their multicellular gametophyte and sporophyte generations based on their genes and genomes. We identified shared genes among land plants and charophycean algae, as well as homologues of the important developmental genes, which have been identified in model species of land plants, from charophycean algae. Moreover, we explored the expression/function of these developmental genes in charalean algae and discussed the origin and evolution of the multicellular body plan in land plants and charophycean algae.Competitive research funding
- 環境研究総合推進費, 2012, Principal investigator絶滅危惧種の多様性情報学と域外保全技術開発:車軸藻類を例にCompetitive research funding
- 環境省, ExTEND2005野生生物の生物学的知見研究, Apr. 2010 - Mar. 2011, Coinvestigatorシャジクモ類の衰退要因解明に向けた環境負荷化学物質の影響に関する生理学的研究
- 財団法人ひょうご科学技術協会, 奨励研究助成, Apr. 2010 - Mar. 2011, Principal investigator陸上植物の2倍体多細胞体制進化の解明Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, 2010 - 2011, Principal investigatorIn order to investigate the origin and evolution of the diploid multicellular sporophytes of land plants, in this study, we performed RNA-seq analysis from different tissues of Chara braunii, which has haploid multicellular gametophyte generation with complex differentiation of cell types and organs. Within contigs obtained in this study, we found many homologues of genes involved in plant development. The phylogenetic, expression and functional analyses in homologues obtained in this study may shed light on the key to understanding the origin and evolution of multicellular sporophytes.Competitive research funding
- 環境研究総合推進費, 2011, Principal investigator絶滅危惧種の多様性情報学と域外保全技術開発:車軸藻類を例にCompetitive research funding
- ニッセイ財団, 環境問題研究助成・若手研究, Oct. 2009 - Sep. 2010, Principal investigator絶滅危惧植物の保全に向けた遺伝子データベース構築 -形態による識別が困難なシャジクモ藻類をモデルに-Competitive research funding
- 日本学術振興会, 科学研究費助成事業 特定領域研究, 特定領域研究, 金沢大学, 2008 - 2009植物の多細胞体制進化の鍵となったゲノム進化の特定ヒメミカヅキモ、シャジクモは、陸上植物に近縁な藻類であり、ヒメミカヅキモは生活環を通じて単細胞性であるが、シャジクモはn世代だけが多細胞体制を作る。n, 2n両世代で多細胞体制を作る陸上植物への進化を解明するため、この2種でEST解析を進めた。 昨年度決定したヒメミカヅキモNIES-67&68株 栄養増殖ステージに加え、A2 ヒメミカヅキモNIES-67株(接合型プラス)性分化誘導ステージ;A3 ヒメミカヅキモNIES-68株(接合型マイナス)性分化誘導ステージ;の完全長cDNAライブラリーを作製し各1万9200クローンについて両端からのESTシークエンスを行った。これにより合計116, 694配列のESTが得られた。この配列を以前から得られていたESTとともにアセンブルし10 620個のcontigを得た。シャジクモについては、B2 シャジクモ生殖器官形成直前ステージ;B3 シャジクモ受精直前ステージの完全長cDNAライブラリーを作製し合計73, 388配列のESTが得られた。 また、ヒメツリガネゴケの受精卵の第一分裂に必要なPpLFY転写因子は陸上植物の2倍体の多細胞体制獲得に関与しているかもしれないのでその相同遺伝子をシャジクモから単離した。 さらにヒメミカヅキモの形質転換の条件を検討し、安定な株を単離できるようにし、ESTから得られた候補遺伝子の機能解析を進めている。 これらの結果は、今後、さらに新型シーケンサーを用いたdeepシーケンシング、ゲノム配列の決定を行い、多細胞体制獲得の鍵が何であったかを解明する基盤となる。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), The University of Tokyo, 2007 - 2009Study on symbiotic systems with Nothofugus species in southern hemisphereIn this study, I examined phylogoenetic relations of some herbivorous insects and its host plants, genus Nothofagus species, which distribute in the Southern Hemisphere. The results of this study are as follows ; 1) In weevils, the species using Nothofagus could be originated independently in Oceania and South America, also. In addition, diversity of both groups were high in Oceania than in South America, 2) In Lepidoptera, closely related species of Nothofagus are used species belongs to same genus in both Oceania and South America, and it is suggested that intercontinental migration had occurred in those moths.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), The University of Tokyo, 2006 - 2008Study of the molecular genetic basis on evolution of multicellular body-plan in plants本研究は、被子植物へと繋がる植物の系統での多様性創生に関わるもっとも重要なステップである多細胞化について着目し、その分子遺伝学的基盤を明らかにすることが目的である。そのため、単細胞生物であるミカヅキモと多細胞化したシャジクモにおいて、遺伝子の網羅的かつ系統的解析を行い、どのような制御機構や遺伝子ネットワークが多細胞化や初期の器官分化において重要な働きをしたかを明らかにする。 シャジクモの栄養成長時の細胞と有性生殖器官からそれぞれRNA を単離し, cDNA を合成した.両者のcDNA について均一化したライブラリーを作製してEST を取得した.約6000 個について配列決定を行い、プロファイリングを行なった。転写制御遺伝子であるLEAFY 遺伝子とKNOX遺伝子について行ない、シャジクモ藻類で初めて単離に成功した。 これらの遺伝子についてDNA 配列決定を行ない、陸上植物の相同遺伝子とともに系統解析を行なうとともに発現解析を行った。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), The University of Tokyo, 2006 - 2008Phylogenetic relationships among almost all species of Nitella (Characeae, Charales)シャジクモ藻類Nitella属は世界中に広く分布し、大部分は特異な形態や生態を示す地域固有種である。本研究で世界中から多くの重要な種を採集し、分子系統解析によってそれらの系統関係を調査した結果、Nitella属は単系統群(共通祖先から派生した種をすべて含むグループ)ではなく、従来の分類体系は実際の系統関係と大きく矛盾していることが明らかになった。本研究の結果に基づいて従来の分類体系の矛盾点を修正し、その成果の一部を国際誌および学会で発表し、新分類体系構築への方向性を示した。