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2018 Fiscal Year Annual Research Report

New modeling and mathematical analysis for pattern formations in life sciences

Research Project

Project/Area Number 18H01139
Research InstitutionRyukoku University

Principal Investigator

森田 善久  龍谷大学, 理工学部, 教授 (10192783)

Co-Investigator(Kenkyū-buntansha) 神保 秀一  北海道大学, 理学研究院, 教授 (80201565)
岩見 真吾  九州大学, 理学研究院, 准教授 (90518119)
李 聖林  広島大学, 理学研究科, 准教授 (50620069)
村川 秀樹  九州大学, 数理学研究院, 助教 (40432116)
宮路 智行  明治大学, 研究・知財戦略機構, 特任准教授 (20613342)
Project Period (FY) 2018-04-01 – 2022-03-31
KeywordsTuring不安定性 / 細胞極性モデル / 反応拡散方程式 / フロント波の伝播 / 細胞接着モデル / ウィルス感染モデル / 安定性解析
Outline of Annual Research Achievements

これまで以下の成果を得ている。
1)細胞極性のモデル方程式についての研究を遂行した。領域を細胞質、境界を細胞膜に見立て、(バルクな)領域内を拡散する物質と、境界(膜)上を拡散する物質が、境界条件によってやり取りされる数理モデルを考える。このようなモデルは、空間次元の異なる領域と境界におけるそれぞれの拡散方程式をカップルしてできており、新しい数学的な研究対象である。総質量が保存される場合について、空間的に一様な定常解の線形化安定性を調べ、拡散の効果によって不安定化する条件を導いた。この拡散による不安定化の現象は、Turing タイプの不安定化として特徴付けられる。この成果は論文としてまとめ現在投稿中である。2)李は、局在化現象が起こるあるタイプの細胞極性の数理モデルにおいて、空間的に非一様な効果を入れた場合を研究した。局在化を表すスパイク形状の解が運動する過程とその定常状態を数学的に記述することに成功し、その成果は論文として出版さている。3)森田と神保は、複雑な領域での拡散伝播の効果を研究するため、複数の半直線を一点でつないだ分岐・合流点を持つ星状領域において、反応拡散方程式のフロント波の伝播と、分岐・合流点で伝播が阻止される現象について数学的な解析を行ない、安定定常解の出現によって伝播の阻止が生じる条件を得た。この成果は論文として出版されている。4)村川は、細胞接着の数理モデルの研究を進め数値計算の新しいスキームに関する評価を得た。5)岩見は、ウィルス感染の実験データをもとに数理モデルの改良を進めており、新しいモデルの提案を行った。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

研究課題の具体的な問題として設定していた細胞極性の数理モデルについての解析が進み数学的な成果が得られた。また、間接的に関連した問題についてもいくつか成果が得られており、順調に進展していると評価できる。

Strategy for Future Research Activity

以下のような課題について、セミナーや研究打合せを行いながら研究を進めていく。また、関連した研究をしている専門家を招いて情報交換を行う。
1)細胞極性モデルの解が示す空間パターンの形状についてのさらに詳しい研究を進める。2)バルク・側方拡散モデルの研究を細胞極性モデルの解析に応用する。3)ウイルス感染の空間的効果を取り入れた数理モデルについて研究を進める。

  • Research Products

    (35 results)

All 2019 2018

All Journal Article (14 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 13 results) Presentation (21 results) (of which Int'l Joint Research: 18 results,  Invited: 17 results)

  • [Journal Article] Entire solutions to reaction-diffusion equations in multiple half-lines with a junction2019

    • Author(s)
      Jimbo Shuichi、Morita Yoshihisa
    • Journal Title

      Journal of Differential Equations

      Volume: 267 Pages: 1247~1276

    • DOI

      10.1016/j.jde.2019.02.008

    • Peer Reviewed
  • [Journal Article] Asymptotic behavior of eigenfrequencies of a thin elastic rod with non-uniform cross-section2019

    • Author(s)
      Shuichi JIMBO, Albert Rodriguez Mulet
    • Journal Title

      J. Math. Soc. Japan

      Volume: 印刷中 Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Exact solutions of nonlinear diffusion-convection-reaction equation: A Lie symmetry analysis approach2019

    • Author(s)
      Molati Motlatsi、Murakawa Hideki
    • Journal Title

      Communications in Nonlinear Science and Numerical Simulation

      Volume: 67 Pages: 253~263

    • DOI

      10.1016/j.cnsns.2018.06.024

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Epidermal growth factor receptor is a host-entry cofactor triggering hepatitis B virus internalization2019

    • Author(s)
      Iwamoto Masashi、Saso Wakana、Sugiyama Ryuichi、Ishii Koji、Ohki Mio、Nagamori Shushi、Suzuki Ryosuke、Aizaki Hideki、Ryo Akihide、Yun Ji-Hye、Park Sam-Yong、Ohtani Naoko、Muramatsu Masamichi、Iwami Shingo、Tanaka Yasuhito、Sureau Camille、Wakita Takaji、Watashi Koichi
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 116 Pages: 8487~8492

    • DOI

      10.1073/pnas.1811064116

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mathematical Analysis of a Transformed ODE from a PDE Multiscale Model of Hepatitis C Virus Infection2019

    • Author(s)
      Kitagawa Kosaku、Kuniya Toshikazu、Nakaoka Shinji、Asai Yusuke、Watashi Koichi、Iwami Shingo
    • Journal Title

      Bulletin of Mathematical Biology

      Volume: 81 Pages: 1427~1441

    • DOI

      10.1007/s11538-018-00564-y

    • Peer Reviewed
  • [Journal Article] Quantitative Immunology by Data Analysis Using Mathematical Models2019

    • Author(s)
      Iwanami Shoya、Iwami Shingo
    • Journal Title

      Reference Module in Life Sciences

      Volume: - Pages: 984~992

    • DOI

      10.1016/B978-0-12-809633-8.20250-1

    • Peer Reviewed
  • [Journal Article] Human photoplethysmogram through the Morse graph: Searching for the saddle point in experimental data2019

    • Author(s)
      Miyaji Tomoyuki、Sviridova Nina、Aihara Kazuyuki、Zhao Tiejun、Nakano Akimasa
    • Journal Title

      Chaos: An Interdisciplinary Journal of Nonlinear Science

      Volume: 29 Pages: 043121~043121

    • DOI

      doi: 10.1063/1.5088989

    • Peer Reviewed
  • [Journal Article] Stability and Spectral Comparison of a Reaction?Diffusion System with Mass Conservation2018

    • Author(s)
      Latos Evangelos、Morita Yoshihisa、Suzuki Takashi
    • Journal Title

      Journal of Dynamics and Differential Equations

      Volume: 30 Pages: 823~844

    • DOI

      doi.org/10.1007/s10884-018-9650-6

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Numerical analysis for nonlinear diffusion problems2018

    • Author(s)
      村川秀樹
    • Journal Title

      数理解析研究所講究録

      Volume: 2094 Pages: 16~25

  • [Journal Article] Malaria incidences in South Africa linked to a climate mode in southwestern Indian Ocean2018

    • Author(s)
      Behera Swadhin K.、Morioka Yushi、Ikeda Takayoshi、Doi Takeshi、Ratnam Jayanthi V.、Nonaka Masami、Tsuzuki Ataru、Imai Chisato、Kim Yoonhee、Hashizume Masahiro、Iwami Shingo、Kruger Philip、Maharaj Rajendra、Sweijd Neville、Minakawa Noboru
    • Journal Title

      Environmental Development

      Volume: 27 Pages: 47~57

    • DOI

      10.1016/j.envdev.2018.07.002

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dynamics of HIV-1 coinfection in different susceptible target cell populations during cell-free infection2018

    • Author(s)
      Ito Yusuke、Tauzin Alexandra、Remion Azaria、Ejima Keisuke、Mammano Fabrizio、Iwami Shingo
    • Journal Title

      Journal of Theoretical Biology

      Volume: 455 Pages: 39~46

    • DOI

      10.1016/j.jtbi.2018.06.025

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A PDE multiscale model of hepatitis C virus infection can be transformed to a system of ODEs2018

    • Author(s)
      Kitagawa Kosaku、Nakaoka Shinji、Asai Yusuke、Watashi Koichi、Iwami Shingo
    • Journal Title

      Journal of Theoretical Biology

      Volume: 448 Pages: 80~85

    • DOI

      10.1016/j.jtbi.2018.04.006

    • Peer Reviewed
  • [Journal Article] Dynamics of Localized Unimodal Patterns in Reaction-Diffusion Systems for Cell Polarization by Extracellular Signaling2018

    • Author(s)
      Kuwamura Masataka、Seirin-Lee Sungrim、Ei Shin-ichiro
    • Journal Title

      SIAM Journal on Applied Mathematics

      Volume: 78 Pages: 3238~3257

    • DOI

      10.1137/18M1163749

    • Peer Reviewed
  • [Journal Article] Phase Field Method and Its Application to Biology2018

    • Author(s)
      LEE S. Seirin、KOBAYASHI Ryo
    • Journal Title

      Seibutsu Butsuri

      Volume: 58 Pages: 216~219

    • DOI

      10.2142/biophys.58.216

    • Peer Reviewed
  • [Presentation] Turing-type instability in coupled equations of bulk and lateral diffusions2018

    • Author(s)
      Y. Morita
    • Organizer
      ReaDiNet2018
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions to reaction-diffusion equations in a domain of star graph2018

    • Author(s)
      Y. Morita
    • Organizer
      The 43rd Sapporo Symposium on Partial Differential Equations
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions of reaction-diffusion equations in multiple semi-infinite intervals with a junction2018

    • Author(s)
      Y. Morita
    • Organizer
      Infinite Dimensional and Stochastic Dynamical Systems
    • Int'l Joint Research / Invited
  • [Presentation] Turing-type instability of diffusion equations with mass transport through the boundary2018

    • Author(s)
      Y. Morita
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions to a reaction-diffusion equation in a domain of half-lines with a junction2018

    • Author(s)
      Y. Morita
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Int'l Joint Research / Invited
  • [Presentation] Y-shaped graph and time entire solutions of a semilinear parabolic equation2018

    • Author(s)
      神保秀一
    • Organizer
      RIMS研究集会ー反応拡散方程式 -- 伝播現象と特異性の解析および諸科学への応用
    • Invited
  • [Presentation] A population dynamics model of cell-cell adhesion and its applications2018

    • Author(s)
      H. Murakawa
    • Organizer
      Karlstad Applied Analysis Seminar
    • Int'l Joint Research / Invited
  • [Presentation] Applications of a population dynamics model of cell-cell adhesion2018

    • Author(s)
      H. Murakawa
    • Organizer
      Journee d'Analyse Non Lineaire
    • Int'l Joint Research / Invited
  • [Presentation] An efficient linear scheme for nonlinear diffusion problems2018

    • Author(s)
      H. Murakawa
    • Organizer
      The Seventh China-Japan-Korea Joint Conference on Numerical Mathematics
    • Int'l Joint Research / Invited
  • [Presentation] A continuous model of cell-cell adhesion and its applications2018

    • Author(s)
      H. Murakawa
    • Organizer
      Czech-Japanese Seminar in Applied Mathematics 2018
    • Int'l Joint Research
  • [Presentation] A mathematical model of cell-cell adhesion and its application2018

    • Author(s)
      H. Murakawa
    • Organizer
      The 12th AIMS Conference on Dynamical Systems,Differential Equations and Applications
    • Int'l Joint Research / Invited
  • [Presentation] Mathematical Modeling of Cell-cell Adhesion and its Applications2018

    • Author(s)
      H. Murakawa
    • Organizer
      Joint Annual Meeting of 70th JSCB and 51st JSDB
    • Int'l Joint Research
  • [Presentation] 細胞間接着の数理モデルとその応用2018

    • Author(s)
      村川秀樹
    • Organizer
      第15回 生物数学の理論とその応用 --次世代の数理科学への展開--
    • Invited
  • [Presentation] Mathematical modeling of cell-cell adhesion and its applications2018

    • Author(s)
      村川秀樹
    • Organizer
      日本応用数理学会2018年度年会
  • [Presentation] Quantifying antiviral activity optimizes drug combinations against hepatitis C virus infection2018

    • Author(s)
      S. Iwami
    • Organizer
      ECMTB2018
    • Int'l Joint Research / Invited
  • [Presentation] PKPDVD modeling for multi-drug treatment on HCV infection2018

    • Author(s)
      S. Iwami
    • Organizer
      KSIAM2018
    • Int'l Joint Research / Invited
  • [Presentation] Characterizing SHIV infection in vitro and in vivo2018

    • Author(s)
      S. Iwami
    • Organizer
      2018 Annual Meeting of JSMB & SMB
    • Int'l Joint Research / Invited
  • [Presentation] Multifarious Eruptions of Urticaria Solved by A Simple Mathematical Equation2018

    • Author(s)
      S. Seiren-Lee
    • Organizer
      A3 international meeting
    • Int'l Joint Research / Invited
  • [Presentation] Pattern formation induced by a domain deformation2018

    • Author(s)
      S. Seirin-Lee
    • Organizer
      ECMTB2018 conference
    • Int'l Joint Research
  • [Presentation] Shape, length and location of PAR polarity in asymmetric cell division2018

    • Author(s)
      S. Seirin-Lee
    • Organizer
      2018 Annual Meeting of JSMB & SMB
    • Int'l Joint Research / Invited
  • [Presentation] Cell, shape, pattern formation, and the modeling tool for describing all of them2018

    • Author(s)
      S. Seirin-Lee
    • Organizer
      he 3rd A3 international workshop on mathematical and life sciences
    • Int'l Joint Research / Invited

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Published: 2019-12-27  

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