Ryugaku Jinja · Professor Archive
Public Professor Archive
Yujiro Higuchi樋口 雄二郎
Kagoshima University · Graduate School of Medical and Dental Sciences · 准教授
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留学
神社Kagoshima University · Graduate School of Medical and Dental Sciences · 准教授
Research keywordsCharcot-Marie-Tooth病・遺伝子診断・分子病態・aaRS関連遺伝子・遺伝性運動ニューロパチー・視神経脊髄炎関連疾患・側方注視麻痺・DNMT1関連疾患・脳小血管病・視覚誘発電位
Research fieldsNeurology・遺伝学
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- Sato Takeo, Tsuchimochi Yuka, Hamada Yuki, Kukihara Kaishi, Kawabata Yutaro, Iwamoto Kana, Takaguchi Go, Higuchi Yujiro, Matsuoka Hideki, Takashima Hiroshi2026 · 記述言語: 英語 出版者・発行元: Nature Publishing Group
- Ando M., Okamoto Y., Higuchi Y., Yuan J.H., Yoshimura A., Yano C., Nagatomo R., Hobara T., Kojima F., Hiramatsu Y., Nozuma S., Sakiyama Y., Takashima H. . Arginine ameliorates motor and surviv2026 · 担当区分: 責任著者 記述言語: 日本語 掲載種別: 研究論文(学術雑誌) 出版者・発行元: Neurotherapeutics Charcot-Marie-Tooth disease type 2 A (CMT2A) is an inherited axonal neuropathy linked to mutations in MFN2, a key regulator of mitochondrial dynamics. Currently, no effective drug therapies exist. l-arginine has shown promise in treating mitochondrial disorders, though its effect on MFN2-associated neuropathy remains uncertain. To investigate this, we used Drosophila models with the neuron-specific knockdown of Marf, the fly ortholog of MFN2, employing a temporally controlled GAL4/UAS system. Flies were administered different doses of l-arginine to examine its influence on motor ability and lifespan. To evaluate responses under mitochondrial stress, flies were also treated with rotenone, a mitochondrial complex I inhibitor. l-arginine markedly improved climbing performance under baseline conditions and extended lifespan under both baseline and stress conditions. However under rotenone-induced mitochondrial stress, high-dose l-arginine improved survival without a corresponding improvement in locomotor performance. These results support a neuroprotective role for l-arginine in MFN2-deficient Drosophila, possibly through effects on mitochondrial dynamics involving complex I. l-arginine may hold therapeutic promise for CMT2A, meriting further investigation in vertebrate models. DOI: 10.1016/j.neurot.2026.e00900 Scopus PubMed
- Higuchi Y., Yoshizaki K., Nakanishi K., Yuan J., Hobara T., Kojima F., Hiramatsu Y., Ando M., Yoshimura A., Nozuma S., Sakiyama Y., Hashiguchi A., Okamoto Y., Matsuura E., Yamasaki R., Hashida H., His2026 · 担当区分: 筆頭著者, 責任著者 記述言語: 日本語 掲載種別: 研究論文(学術雑誌) 出版者・発行元: Genetics in Medicine Purpose Despite advances in diagnostics, many inherited peripheral neuropathies remain genetically unexplained. We investigated whether biallelic variants in FAT3 ( FAT Atypical Cadherin 3 ) are implicated in inherited axonal neuropathies. Methods We identified biallelic FAT3 variants in three unrelated individuals among 3315 Japanese patients with inherited peripheral neuropathies. Variants were evaluated by segregation analysis, in silico modeling, and functional studies in Drosophila and mouse models. Results All patients exhibited progressive distal muscle weakness and cranial nerve involvement, including tongue atrophy, dysarthria, and facial weakness. Two required ventilatory support because of respiratory muscle paralysis. One patient additionally showed central hypomyelination, autonomic dysfunction, and developmental anomalies, such as congenital scoliosis and intestinal pseudo-obstruction. Identified variants were ultrarare, affected conserved residues, segregated with disease, and were predicted to impair domain stability. FAT3 knockdown in Drosophila resulted in rough eye phenotype, shortened lifespan, impaired motor function, and defective motor neuron branching. Fat3 knockout and knockin mice displayed perinatal lethality, sciatic nerve axonal degeneration, and central nervous system abnormalities despite preserved motor performance. Conclusion Our findings establish FAT3 as a novel gene for autosomal-recessive axonal neuropathies and support the concept of a FAT3 -related multisystem neurodevelopmental disorder characterized by motor neuron degeneration and systemic abnormalities. DOI: 10.1016/j.gim.2026.102570 Scopus PubMed
- 櫻井 芳騎, 京谷 美月, 一條 真彦, 桑原 宏哉, 樋口 雄二郎, 玉井 知里, 曽根 淳, 鎌田 智幸2026 · 記述言語: 日本語 出版者・発行元: (一社)日本神経学会
- Stroke Genetics-南九州地域における脳血管疾患の包括的ゲノム解析と臨床疫学2025 · 担当区分: 研究代表者
- 難病患者等療養生活支援のための研修会及び支援計画検討会2025 · 2025年05月
- 脊髄小脳変性症の臨床疫学と新規原因遺伝子の同定2024 · 担当区分: 研究代表者 配分額: 4290000円 ( 直接経費: 3300000円 、 間接経費: 990000円 ) 本研究の目的は以下の2点である。 ①脊髄小脳変性症 (Spinocerebellar Degeneration: SCD)の包括的な遺伝子検査を継続させ、国内SCD患者の詳細な疫学データ・臨床的特徴を明らかにする。 ②SCDの新規原因遺伝子を同定し、臨床的・遺伝学的解析を行い、病態モデル細胞・疾患モデル生物(ショウジョウバエ・マウス)を樹立・解析することで、SCDの治療法開発のための病態解明のブレイクスルーを行う。 ①については、南九州を中心とした小脳失調症症例におけるFGF14リピート解析(SCA27B)を行い、本年度に学術論文として報告した。具体的には、遺伝性小脳失調症疑い940症例を対象にFGF14遺伝子GAAリピートを解析し、11家系12症例に病的リピート伸長を認め、その臨床的特徴や遺伝学的特徴を報告した(Ann Clin Transl Neurol.2024). また、新規原因遺伝子COA7の新規3家系を同定し、小脳失調、ニューロパチー以外に新たにジストニアやパーキンソニズムを呈する症例を見出した。COA7関連疾患がより多様な表現型を呈する疾患であることを明らかにし、遺伝性ジストニア、家族性パーキンソン病、遺伝性痙性対麻痺など、より多くの症例に対してCOA7遺伝子検査を実施することを提唱した(Journal of Neurology. 2023)。 ②については、エクソーム解析にて、新規候補遺伝子Xを同定している。遺伝子Xについては、臨床的・遺伝学的解析が済み、次年度は病態解明のため、疾患モデル生物(ゼブラフィッシュ)を樹立・解析を進める。
- 遺伝性ニューロパチーの遺伝学的研究2022 · CMT友の会 CMT友の会 秋のオンライン交流会・総会 2022年10月
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