2021 Fiscal Year Final Research Report
Design of new optogenetic genes by a bioinformatic approach
Project/Area Number |
19K09945
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 56060:Ophthalmology-related
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Research Institution | Iwate University |
Principal Investigator |
Sugano Eriko 岩手大学, 理工学部, 准教授 (70375210)
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Co-Investigator(Kenkyū-buntansha) |
富田 浩史 岩手大学, 理工学部, 教授 (40302088)
田端 希多子 岩手大学, 理工学部, 特任准教授 (80714576)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | オプトジェネティクス / 神経細胞 / 網膜色素変性症 |
Outline of Final Research Achievements |
Roska et al. reported that photoreceptor degeneration is delayed by the transgene of light-gated Cl- channel, NpHR, to photoreceptor cells before the degeneration. Recently, NpHR and Jaws are used as the light-gated Cl- channel. However, it is needed to excessive light illumination (5mW/mm2: laser) to activate the channel. In contrast, we developed a new light-gated Cl- channel, which is activated by the low light stimulation (1mW/mm2: LED), and 300pA of photocurrent was recorded by the LED stimulation. In this study, mutations were designed and analyzed to improve the photocurrent. Designed DNA was transfected to cells and photocurrent was recorded by a patch-clamp method. These results showed that there was a negative correlation between membrane-limited expression and photocurrent in the anion channel rhodopsin derived from Guillardia theta.
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Free Research Field |
眼科学
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Academic Significance and Societal Importance of the Research Achievements |
光感受性陰イオンチャネルは、神経細胞に過分極を誘導する方法として研究されてきたが、その応答性はカチオンチャネルと比較し、極めて低いものである。我々の開発した光感受性Cl-チャネルは、既報告と比較し、高い応答性を示した。開発したツールは、神経活動のマニュピュレーションに有用であると共に、Roskaらが示したように (Roska, Scoence.2010)、視細胞変性を抑制するツールとして有用である。また、本研究において、アニオンチャネルロドプシンが膜発現性と光反応性に負の相関があることを示したが、本相関はこれまでに報告がなく、アニオンチャネルロドプシンの開発において、重要な知見である。
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