2021/05/15 更新

写真a

コヤマ アキヒデ
小山 哲秀
KOYAMA Akihide
所属
教育研究院 医歯学系 医学系列 助教
医歯学総合研究科 地域疾病制御医学専攻 地域予防医学 助教
職名
助教
通称等の別名
koyamaa
外部リンク

学位

  • 博士(医学) ( 2017年3月   新潟大学 )

研究キーワード

  • 神経疾患

  • 法医学

  • 安定同位体

  • 包括脳ネットワーク

  • バイオマーカー

  • 透明化

  • 脊髄小脳変性症

  • Tau

研究分野

  • ライフサイエンス / 法医学

  • ライフサイエンス / 神経内科学

  • ライフサイエンス / 基盤脳科学

経歴(researchmap)

  • 新潟大学大学院医歯学総合研究科死因究明教育センター(兼任)   Graduate School of Medical and Dental Sciences   助教

    2017年7月 - 現在

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  • 新潟大学医学部法医学教室   Faculty of Medicine   助教

    2017年4月 - 現在

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  • 新潟大学脳研究所システム脳病態学分野   Brain Research Institute   特任助教

    2016年10月 - 2017年3月

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  • 新潟大学研究機構超域学術院 助教

    2012年4月 - 2016年9月

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経歴

  • 新潟大学   医歯学総合研究科 地域疾病制御医学専攻 地域予防医学   助教

    2017年4月 - 現在

  • 新潟大学   脳研究所   特任助教

    2016年10月 - 2017年3月

  • 新潟大学   研究推進機構 超域学術院   助教

    2011年4月 - 2016年9月

学歴

  • 新潟大学大学院医歯学総合研究科 博士(医学)乙第1784号

    2017年3月

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  • 新潟大学大学院医歯学総合研究科医科学専攻修了(医科学修士)

    2007年4月 - 2009年3月

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所属学協会

 

論文

  • Hemorrhagic cerebral small vessel disease caused by a novel mutation in 3' UTR of collagen type IV alpha 1. 査読 国際誌

    Naoko Sakai, Masahiro Uemura, Taisuke Kato, Hiroaki Nozaki, Akihide Koyama, Shouichirou Ando, Hiroyuki Kamei, Motohiro Kato, Osamu Onodera

    Neurology. Genetics6 ( 1 ) e383   2020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)  

    DOI: 10.1212/NXG.0000000000000383

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  • HTRA1-Related Cerebral Small Vessel Disease: A Review of the Literature. 査読 国際誌

    Masahiro Uemura, Hiroaki Nozaki, Taisuke Kato, Akihide Koyama, Naoko Sakai, Shoichiro Ando, Masato Kanazawa, Nozomi Hishikawa, Yoshinori Nishimoto, Kiran Polavarapu, Atchayaram Nalini, Akira Hanazono, Daisuke Kuzume, Akihiro Shindo, Mohammad El-Ghanem, Arata Abe, Aki Sato, Mari Yoshida, Takeshi Ikeuchi, Ikuko Mizuta, Toshiki Mizuno, Osamu Onodera

    Frontiers in neurology11   545 - 545   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL) is clinically characterized by early-onset dementia, stroke, spondylosis deformans, and alopecia. In CARASIL cases, brain magnetic resonance imaging reveals severe white matter hyperintensities (WMHs), lacunar infarctions, and microbleeds. CARASIL is caused by a homozygous mutation in high-temperature requirement A serine peptidase 1 (HTRA1). Recently, it was reported that several heterozygous mutations in HTRA1 also cause cerebral small vessel disease (CSVD). Although patients with heterozygous HTRA1-related CSVD (symptomatic carriers) are reported to have a milder form of CARASIL, little is known about the clinical and genetic differences between the two diseases. Given this gap in the literature, we collected clinical information on HTRA1-related CSVD from a review of the literature to help clarify the differences between symptomatic carriers and CARASIL and the features of both diseases. Forty-six symptomatic carriers and 28 patients with CARASIL were investigated. Twenty-eight mutations in symptomatic carriers and 22 mutations in CARASIL were identified. Missense mutations in symptomatic carriers are more frequently identified in the linker or loop 3 (L3)/loop D (LD) domains, which are critical sites in activating protease activity. The ages at onset of neurological symptoms/signs were significantly higher in symptomatic carriers than in CARASIL, and the frequency of characteristic extraneurological findings and confluent WMHs were significantly higher in CARASIL than in symptomatic carriers. As previously reported, heterozygous HTRA1-related CSVD has a milder clinical presentation of CARASIL. It seems that haploinsufficiency can cause CSVD among symptomatic carriers according to the several patients with heterozygous nonsense/frameshift mutations. However, the differing locations of mutations found in the two diseases indicate that distinct molecular mechanisms influence the development of CSVD in patients with HTRA1-related CSVD. These findings further support continued careful examination of the pathogenicity of mutations located outside the linker or LD/L3 domain in symptomatic carriers.

    DOI: 10.3389/fneur.2020.00545

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  • Non-genetically modified models exhibit TARDBP mRNA increase due to perturbed TDP-43 autoregulation. 査読 国際誌

    Akihiro Sugai, Taisuke Kato, Akihide Koyama, Yuka Koike, Takuya Konno, Tomohiko Ishihara, Osamu Onodera

    Neurobiology of disease130   104534 - 104534   2019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)  

    Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by accumulation of fragmented insoluble TDP-43 and loss of TDP-43 from the nucleus. Increased expression of exogenous TARDBP (encoding TDP-43) induces TDP-43 pathology and cytotoxicity, suggesting the involvement of aberrant expression of TDP-43 in the pathogenesis of ALS. In normal conditions, however, the amount of TDP-43 is tightly regulated by the autoregulatory mechanism involving alternative splicing of TARDBP mRNA. To investigate the influence of autoregulation dysfunction, we inhibited the splicing of cryptic intron 6 using antisense oligonucleotides in vivo. This inhibition doubled the Tardbp mRNA expression, increased the fragmented insoluble TDP-43, and reduced the number of motor neurons in the mouse spinal cord. In human induced pluripotent stem cell-derived neurons, the splicing inhibition of intron 6 increased TARDBP mRNA and decreased nuclear TDP-43. These non-genetically modified models exhibiting rise in the TARDBP mRNA levels suggest that TDP-43 autoregulation turbulence might be linked to the pathogenesis of ALS.

    DOI: 10.1016/j.nbd.2019.104534

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  • An autopsy case of peliosis hepatis with X-linked myotubular myopathy. 査読 国際誌

    Kazuhisa Funayama, Hiroshi Shimizu, Hidetomo Tanaka, Izumi Kawachi, Ichizo Nishino, Kou Matsui, Naoya Takahashi, Akihide Koyama, Rieka Katsuragi-Go, Ryoko Higuchi, Takashi Aoyama, Hiraku Watanabe, Akiyoshi Kakita, Hisakazu Takatsuka

    Legal medicine (Tokyo, Japan)38   77 - 82   2019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)  

    This report describes the autopsy case of a 4-year-old boy who died from hepatic hemorrhage and rupture caused by peliosis hepatis with X-linked myotubular myopathy. Peliosis hepatis is characterized by multiple blood-filled cavities of various sizes in the liver, which occurs in chronic wasting disease or with the use of specific drugs. X-linked myotubular myopathy is one of the most serious types of congenital myopathies, in which an affected male infant typically presents with severe hypotonia and respiratory distress immediately after birth. Although each disorder is rare, 12 cases of pediatric peliosis hepatis associated with X-linked myotubular myopathy have been reported, including our case. Peliosis hepatis should be considered as a cause of hepatic hemorrhage despite its low incidence, and it requires adequate gross and histological investigation for correct diagnosis.

    DOI: 10.1016/j.legalmed.2019.04.005

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  • HTRA1 Mutations Identified in Symptomatic Carriers Have the Property of Interfering the Trimer-Dependent Activation Cascade. 査読 国際誌

    Masahiro Uemura, Hiroaki Nozaki, Akihide Koyama, Naoko Sakai, Shoichiro Ando, Masato Kanazawa, Taisuke Kato, Osamu Onodera

    Frontiers in neurology10   693 - 693   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Background: Mutations in the high-temperature requirement A serine peptidase 1 (HTRA1) cause cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL). Most carriers for HTRA1 mutations are asymptomatic, but more than 10 mutations have been reported in symptomatic carriers. The molecular differences between the mutations identified in symptomatic carriers and mutations identified only in CARASIL patients are unclear. HTRA1 is a serine protease that forms homotrimers, with each HTRA1 subunit activating the adjacent HTRA1 via the sensor domain of loop 3 (L3) and the activation domain of loop D (LD). Previously, we analyzed four HTRA1 mutant proteins identified in symptomatic carriers and found that they were unable to form trimers or had mutations in the LD or L3 domain. The mutant HTRA1s with these properties are presumed to inhibit trimer-dependent activation cascade. Indeed, these mutant HTRA1s inhibited wild-type (WT) protease activity. In this study, we further analyzed 15 missense HTRA1s to clarify the molecular character of mutant HTRA1s identified in symptomatic carriers. Methods: We analyzed 12 missense HTRA1s identified in symptomatic carriers (hetero-HTRA1) and three missense HTRA1s found only in CARASIL (CARASIL-HTRA1). The protease activity of the purified recombinant mutant HTRA1s was measured using fluorescein isothiocyanate-labeled casein as substrate. Oligomeric structure was evaluated by size-exclusion chromatography. The protease activities of mixtures of WT with each mutant HTRA1 were also measured. Results: Five hetero-HTRA1s had normal protease activity and were excluded from further analysis. Four of the seven hetero-HTRA1s and one of the three CARASIL-HTRA1s were unable to form trimers. The other three hetero-HTRA1s had mutations in the LD domain. Together with our previous work, 10 of 11 hetero-HTRA1s and two of six CARASIL-HTRA1s were either defective in trimerization or had mutations in the LD or L3 domain (P = 0.006). By contrast, eight of 11 hetero-HTRA1s and two of six CARASIL-HTRA1 inhibited WT protease activity (P = 0.162). Conclusions: HTRA1 mutations identified in symptomatic carriers have the property of interfering the trimer-dependent activation cascade of HTRA1.

    DOI: 10.3389/fneur.2019.00693

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  • Robustness and Vulnerability of the Autoregulatory System That Maintains Nuclear TDP-43 Levels: A Trade-off Hypothesis for ALS Pathology Based on in Silico Data. 査読 国際誌

    Akihiro Sugai, Taisuke Kato, Akihide Koyama, Yuka Koike, Sou Kasahara, Takuya Konno, Tomohiko Ishihara, Osamu Onodera

    Frontiers in neuroscience12   28 - 28   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Abnormal accumulation of TAR DNA-binding protein 43 (TDP-43) in the cytoplasm and its disappearance from the nucleus are pathological features of amyotrophic lateral sclerosis and frontotemporal dementia (ALS/FTD) and are directly involved in the pathogenesis of these conditions. TDP-43 is an essential nuclear protein that readily aggregates in a concentration-dependent manner. Therefore, cells must strictly maintain an appropriate amount of nuclear TDP-43. In one relevant maintenance mechanism, TDP-43 binds to its pre-mRNA and promotes alternative splicing, resulting in mRNA degradation via nonsense-mediated mRNA decay. The level of nuclear TDP-43 is tightly regulated by these mechanisms, which control the amount of mRNA that may be translated. Based on the results of previous experiments, we developed an in silico model that mimics the intracellular dynamics of TDP-43 and examined TDP-43 metabolism under various conditions. We discovered an inherent trade-off in this mechanism between transcriptional redundancy, which maintains the robustness of TDP-43 metabolism, and vulnerability to specific interfering factors. These factors include an increased tendency of TDP-43 to aggregate, impaired nuclear-cytoplasmic TDP-43 transport, and a decreased efficiency of degrading abnormal proteins, all of which are functional abnormalities related to the gene that causes familial ALS/FTD. When these conditions continue at a certain intensity, the vulnerability of the autoregulatory machinery becomes apparent over time, and transcriptional redundancy enters a vicious cycle that ultimately results in TDP-43 pathology. The results obtained using this in silico model reveal the difference in TDP-43 metabolism between normal and disease states. Furthermore, using this model, we simulated the effect of a decrease in TDP-43 transcription and found that this decrease improved TDP-43 pathology and suppressed the abnormal propagation of TDP-43. Therefore, we propose a potential therapeutic strategy to suppress transcriptional redundancy, which is the driving force of the pathological condition caused by the specific factors described above, in patients with ALS presenting with TDP-43 pathology. An ALS animal model exhibiting TDP-43 pathology without overexpression of exogenous TDP-43 should be developed to investigate the effect of alleviating the transcriptional redundancy of TARDBP.

    DOI: 10.3389/fnins.2018.00028

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  • The SMN gene copy number states in Japanese ALS patients

    Ishihara T, Toyoda S, Koyama A, Tada M, Atsuta N, Nakamura R, Tohnai G, Sone J, Izumi Y, Kaji R, Morita M, Taniguchi A, Kakita A, Sobue G, Nishizawa M, Onodera O

    JOURNAL OF THE NEUROLOGICAL SCIENCES381   211-211   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)  

    DOI: 10.1016/j.jns.2017.08.604

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  • Performance of a real-time PCR-based approach and droplet digital PCR in detecting human parechovirus type 3 RNA. 査読 国際誌

    Yuta Aizawa, Akihide Koyama, Tomohiko Ishihara, Osamu Onodera, Akihiko Saitoh

    Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology84   27 - 31   2016年11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:ELSEVIER SCIENCE BV  

    BACKGROUND: Human parechovirus type 3 (HPeV3) is an emerging virus that causes sepsis and meningoencephalitis in neonates and young infants. Correct diagnosis of HPeV3 infection is critical in determining appropriate management and predicting patients' clinical course. Real-time reverse transcription PCR (RT-PCR) analysis of serum and/or cerebrospinal fluid (CSF) has been used to diagnose HPeV3 infection; however, the assay detection limits have not been fully evaluated. OBJECTIVES: We tested the hypothesis that droplet digital RT-PCR (RT-ddPCR)-a novel technique that precisely quantitates low-copy target genes by diluting and partitioning samples into compartments-increases the detection rate of HPeV3 RNA as compared with real-time RT-PCR. STUDY DESIGN: Using samples with predetermined HPeV3 copy numbers, we evaluated one-step and two-step RT-ddPCR. Then, we tested two-step RT-ddPCR and real-time RT-PCR, using clinical samples with low copy numbers. Finally, we used two-step RT-ddPCR to evaluate clinical samples obtained from HPeV3-infected patients with positive serum but negative CSF, as determined by real-time RT-PCR. RESULTS: Two-step RT-ddPCR was less variable and more specific than one-step RT-ddPCR. Two-step RT-ddPCR detected HPeV3 RNA in all six CSF samples; four samples (67%) were reproducibly positive and the other two samples (33%) were positive at least once in four replicates. Finally, no nonspecific droplet was positive by two-step RT-ddPCR. CONCLUSIONS: Two-step RT-ddPCR may enhance the rate of HPeV3 RNA detection from samples with low viral loads, thereby improving diagnosis and management of HPeV3-infected patients.

    DOI: 10.1016/j.jcv.2016.09.009

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  • Increased cytoplasmic TARDBP mRNA in affected spinal motor neurons in ALS caused by abnormal autoregulation of TDP-43. 査読 国際誌

    Akihide Koyama, Akihiro Sugai, Taisuke Kato, Tomohiko Ishihara, Atsushi Shiga, Yasuko Toyoshima, Misaki Koyama, Takuya Konno, Sachiko Hirokawa, Akio Yokoseki, Masatoyo Nishizawa, Akiyoshi Kakita, Hitoshi Takahashi, Osamu Onodera

    Nucleic acids research44 ( 12 ) 5820 - 36   2016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)   出版者・発行元:OXFORD UNIV PRESS  

    Amyotrophic lateral sclerosis (ALS) is a fatal motor neuron disorder. In motor neurons of ALS, TAR DNA binding protein-43 (TDP-43), a nuclear protein encoded by TARDBP, is absent from the nucleus and forms cytoplasmic inclusions. TDP-43 auto-regulates the amount by regulating the TARDBP mRNA, which has three polyadenylation signals (PASs) and three additional alternative introns within the last exon. However, it is still unclear how the autoregulatory mechanism works and how the status of autoregulation in ALS motor neurons without nuclear TDP-43 is. Here we show that TDP-43 inhibits the selection of the most proximal PAS and induces splicing of multiple alternative introns in TARDBP mRNA to decrease the amount of cytoplasmic TARDBP mRNA by nonsense-mediated mRNA decay. When TDP-43 is depleted, the TARDBP mRNA uses the most proximal PAS and is increased in the cytoplasm. Finally, we have demonstrated that in ALS motor neurons-especially neurons with mislocalized TDP-43-the amount of TARDBP mRNA is increased in the cytoplasm. Our observations indicate that nuclear TDP-43 contributes to the autoregulation and suggests that the absence of nuclear TDP-43 induces an abnormal autoregulation and increases the amount of TARDBP mRNA. The vicious cycle might accelerate the disease progression of ALS.

    DOI: 10.1093/nar/gkw499

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  • Distinct molecular mechanisms of HTRA1 mutants in manifesting heterozygotes with CARASIL. 査読 国際誌

    Hiroaki Nozaki, Taisuke Kato, Megumi Nihonmatsu, Yohei Saito, Ikuko Mizuta, Tomoko Noda, Ryoko Koike, Kazuhide Miyazaki, Muichi Kaito, Shoichi Ito, Masahiro Makino, Akihide Koyama, Atsushi Shiga, Masahiro Uemura, Yumi Sekine, Ayuka Murakami, Suzuko Moritani, Kenju Hara, Akio Yokoseki, Ryozo Kuwano, Naoto Endo, Takeshi Momotsu, Mari Yoshida, Masatoyo Nishizawa, Toshiki Mizuno, Osamu Onodera

    Neurology86 ( 21 ) 1964 - 74   2016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)  

    OBJECTIVE: To elucidate the molecular mechanism of mutant HTRA1-dependent cerebral small vessel disease in heterozygous individuals. METHODS: We recruited 113 unrelated index patients with clinically diagnosed cerebral small vessel disease. The coding sequences of the HTRA1 gene were analyzed. We evaluated HTRA1 protease activities using casein assays and oligomeric HTRA1 formation using gel filtration chromatography. RESULTS: We found 4 heterozygous missense mutations in the HTRA1 gene (p.G283E, p.P285L, p.R302Q, and p.T319I) in 6 patients from 113 unrelated index patients and in 2 siblings in 2 unrelated families with p.R302Q. The mean age at cognitive impairment onset was 51.1 years. Spondylosis deformans was observed in all cases, whereas alopecia was observed in 3 cases; an autopsied case with p.G283E showed arteriopathy in their cerebral small arteries. These mutant HTRA1s showed markedly decreased protease activities and inhibited wild-type HTRA1 activity, whereas 2 of 3 mutant HTRA1s reported in cerebral autosomal-recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL) (A252T and V297M) did not inhibit wild-type HTRA1 activity. Wild-type HTRA1 forms trimers; however, G283E and T319I HTRA1, observed in manifesting heterozygotes, did not form trimers. P285L and R302Q HTRA1s formed trimers, but their mutations were located in domains that are important for trimer-associated HTRA1 activation; in contrast, A252T and V297M HTRA1s, which have been observed in CARASIL, also formed trimers but had mutations outside the domains important for trimer-associated HTRA1 activation. CONCLUSIONS: The mutant HTRA1s observed in manifesting heterozygotes might result in an impaired HTRA1 activation cascade of HTRA1 or be unable to form stable trimers.

    DOI: 10.1212/WNL.0000000000002694

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  • Distinct molecular mechanisms of HTRA1 mutants in manifesting heterozygotes with CARASIL 査読

    Hiroaki Nozaki, Taisuke Kato, Megumi Nihonmatsu, Yohei Saito, Ikuko Mizuta, Tomoko Noda, Ryoko Koike, Kazuhide Miyazaki, Muichi Kaito, Shoichi Ito, Masahiro Makino, Akihide Koyama, Atsushi Shiga, Masahiro Uemura, Yumi Sekine, Ayuka Murakami, Suzuko Moritani, Kenju Hara, Akio Yokoseki, Ryozo Kuwano, Naoto Endo, Takeshi Momotsu, Mari Yoshida, Masatoyo Nishizawa, Toshiki Mizuno, Osamu Onodera

    NEUROLOGY86 ( 21 ) 1964 - 1974   2016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:LIPPINCOTT WILLIAMS & WILKINS  

    Objective:To elucidate the molecular mechanism of mutant HTRA1-dependent cerebral small vessel disease in heterozygous individuals.Methods:We recruited 113 unrelated index patients with clinically diagnosed cerebral small vessel disease. The coding sequences of the HTRA1 gene were analyzed. We evaluated HTRA1 protease activities using casein assays and oligomeric HTRA1 formation using gel filtration chromatography.Results:We found 4 heterozygous missense mutations in the HTRA1 gene (p.G283E, p.P285L, p.R302Q, and p.T319I) in 6 patients from 113 unrelated index patients and in 2 siblings in 2 unrelated families with p.R302Q. The mean age at cognitive impairment onset was 51.1 years. Spondylosis deformans was observed in all cases, whereas alopecia was observed in 3 cases; an autopsied case with p.G283E showed arteriopathy in their cerebral small arteries. These mutant HTRA1s showed markedly decreased protease activities and inhibited wild-type HTRA1 activity, whereas 2 of 3 mutant HTRA1s reported in cerebral autosomal-recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL) (A252T and V297M) did not inhibit wild-type HTRA1 activity. Wild-type HTRA1 forms trimers; however, G283E and T319I HTRA1, observed in manifesting heterozygotes, did not form trimers. P285L and R302Q HTRA1s formed trimers, but their mutations were located in domains that are important for trimer-associated HTRA1 activation; in contrast, A252T and V297M HTRA1s, which have been observed in CARASIL, also formed trimers but had mutations outside the domains important for trimer-associated HTRA1 activation.Conclusions:The mutant HTRA1s observed in manifesting heterozygotes might result in an impaired HTRA1 activation cascade of HTRA1 or be unable to form stable trimers.

    DOI: 10.1212/WNL.0000000000002694

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  • ApoE-isoform-dependent cellular uptake of amyloid-β is mediated by lipoprotein receptor LR11/SorLA. 査読 国際誌

    Yajima R, Tokutake T, Koyama A, Kasuga K, Tezuka T, Nishizawa M, Ikeuchi T

    Biochemical and biophysical research communications456 ( 1 ) 482 - 8   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.bbrc.2014.11.111

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  • Haploinsufficiency of CSF-1R and clinicopathologic characterization in patients with HDLS. 査読 国際誌

    Takuya Konno, Masayoshi Tada, Mari Tada, Akihide Koyama, Hiroaki Nozaki, Yasuo Harigaya, Jin Nishimiya, Akiko Matsunaga, Nobuaki Yoshikura, Kenji Ishihara, Musashi Arakawa, Aiko Isami, Kenichi Okazaki, Hideaki Yokoo, Kyoko Itoh, Makoto Yoneda, Mitsuru Kawamura, Takashi Inuzuka, Hitoshi Takahashi, Masatoyo Nishizawa, Osamu Onodera, Akiyoshi Kakita, Takeshi Ikeuchi

    Neurology82 ( 2 ) 139 - 48   2014年1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:LIPPINCOTT WILLIAMS & WILKINS  

    OBJECTIVE: To clarify the genetic, clinicopathologic, and neuroimaging characteristics of patients with hereditary diffuse leukoencephalopathy with spheroids (HDLS) with the colony stimulating factor 1 receptor (CSF-1R) mutation. METHODS: We performed molecular genetic analysis of CSF-1R in patients with HDLS. Detailed clinical and neuroimaging findings were retrospectively investigated. Five patients were examined neuropathologically. RESULTS: We found 6 different CSF-1R mutations in 7 index patients from unrelated Japanese families. The CSF-1R mutations included 3 novel mutations and 1 known missense mutation at evolutionarily conserved amino acids, and 1 novel splice-site mutation. We identified a novel frameshift mutation. Reverse transcription PCR analysis revealed that the frameshift mutation causes nonsense-mediated mRNA decay by generating a premature stop codon, suggesting that haploinsufficiency of CSF-1R is sufficient to cause HDLS. Western blot analysis revealed that the expression level of CSF-1R in the brain from the patients was lower than from control subjects. The characteristic MRI findings were the involvement of the white matter and thinning of the corpus callosum with signal alteration, and sequential analysis revealed that the white matter lesions and cerebral atrophy relentlessly progressed with disease duration. Spotty calcifications in the white matter were frequently observed by CT. Neuropathologic analysis revealed that microglia in the brains of the patients demonstrated distinct morphology and distribution. CONCLUSIONS: These findings suggest that patients with HDLS, irrespective of mutation type in CSF-1R, show characteristic clinical and neuroimaging features, and that perturbation of CSF-1R signaling by haploinsufficiency may play a role in microglial dysfunction leading to the pathogenesis of HDLS.

    DOI: 10.1212/WNL.0000000000000046

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  • Decreased number of Gemini of coiled bodies and U12 snRNA level in amyotrophic lateral sclerosis. 査読 国際誌

    Tomohiko Ishihara, Yuko Ariizumi, Atsushi Shiga, Taisuke Kato, Chun-Feng Tan, Tatsuya Sato, Yukari Miki, Mariko Yokoo, Takeshi Fujino, Akihide Koyama, Akio Yokoseki, Masatoyo Nishizawa, Akiyoshi Kakita, Hitoshi Takahashi, Osamu Onodera

    Human molecular genetics22 ( 20 ) 4136 - 47   2013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:OXFORD UNIV PRESS  

    Disappearance of TAR-DNA-binding protein 43 kDa (TDP-43) from the nucleus contributes to the pathogenesis of amyotrophic lateral sclerosis (ALS), but the nuclear function of TDP-43 is not yet fully understood. TDP-43 associates with nuclear bodies including Gemini of coiled bodies (GEMs). GEMs contribute to the biogenesis of uridine-rich small nuclear RNA (U snRNA), a component of splicing machinery. The number of GEMs and a subset of U snRNAs decrease in spinal muscular atrophy, a lower motor neuron disease, suggesting that alteration of U snRNAs may also underlie the molecular pathogenesis of ALS. Here, we investigated the number of GEMs and U11/12-type small nuclear ribonucleoproteins (snRNP) by immunohistochemistry and the level of U snRNAs using real-time quantitative RT-PCR in ALS tissues. GEMs decreased in both TDP-43-depleted HeLa cells and spinal motor neurons in ALS patients. Levels of several U snRNAs decreased in TDP-43-depleted SH-SY5Y and U87-MG cells. The level of U12 snRNA was decreased in tissues affected by ALS (spinal cord, motor cortex and thalamus) but not in tissues unaffected by ALS (cerebellum, kidney and muscle). Immunohistochemical analysis revealed the decrease in U11/12-type snRNP in spinal motor neurons of ALS patients. These findings suggest that loss of TDP-43 function decreases the number of GEMs, which is followed by a disturbance of pre-mRNA splicing by the U11/U12 spliceosome in tissues affected by ALS.

    DOI: 10.1093/hmg/ddt262

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  • Hereditary Diffuse Leukoencephalopathy with Spheroids (HDLS): Clinical Characteristics and Molecular Analyses of CSF-1R 査読

    Konno Takuya, Tada Masayoshi, Koyama Akihide, Tada Mari, Sugai Akihiro, Nozaki Hiroaki, Matsunaga Akiko, Harigaya Yasuo, Nishimiya Jin, Ishihara Kenji, Yoneda Makoto, Kakita Akiyoshi, Takahashi Hitoshi, Kawamura Mitsuru, Onodera Osamu, Nishizawa Masatoyo, Ikeuchi Takeshi

    NEUROLOGY80   2013年2月

  • Cerebral small-vessel disease protein HTRA1 controls the amount of TGF-β1 via cleavage of proTGF-β1. 査読 国際誌

    Shiga A, Nozaki H, Yokoseki A, Nihonmatsu M, Kawata H, Kato T, Koyama A, Arima K, Ikeda M, Katada S, Toyoshima Y, Takahashi H, Tanaka A, Nakano I, Ikeuchi T, Nishizawa M, Onodera O

    Hum Mol Genet.20 ( 9 ) 1800 - 10   2011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)  

    DOI: 10.1093/hmg/ddr063

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  • Genotype-phenotype correlations in early onset ataxia with ocular motor apraxia and hypoalbuminaemia. 査読 国際誌

    Akio Yokoseki, Tomohiko Ishihara, Akihide Koyama, Atsushi Shiga, Mitsunori Yamada, Chieko Suzuki, Yoshiki Sekijima, Kyoko Maruta, Miyuki Tsuchiya, Hidetoshi Date, Tatsuya Sato, Masayoshi Tada, Takeshi Ikeuchi, Shoji Tsuji, Masatoyo Nishizawa, Osamu Onodera

    Brain : a journal of neurology134 ( Pt 5 ) 1387 - 99   2011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  

    Early onset ataxia with ocular motor apraxia and hypoalbuminaemia/ataxia-oculomotor apraxia 1 is a recessively inherited ataxia caused by mutations in the aprataxin gene. We previously reported that patients with frameshift mutations exhibit a more severe phenotype than those with missense mutations. However, reports on genotype-phenotype correlation in early onset ataxia with ocular motor apraxia and hypoalbuminaemia are controversial. To clarify this issue, we studied 58 patients from 39 Japanese families, including 40 patients homozygous for c.689_690insT and nine patients homozygous or compound heterozygous for p.Pro206Leu or p.Val263Gly mutations who were compared with regard to clinical phenotype. We performed Kaplan-Meier analysis and log-rank tests for the ages of onset of gait disturbance and the inability to walk without assistance. The cumulative rate of gait disturbance was lower among patients with p.Pro206Leu or p.Val263Gly mutations than among those homozygous for the c.689_690insT mutation (P=0.001). The cumulative rate of inability to walk without assistance was higher in patients homozygous for the c.689_690insT mutation than in those with p.Pro206Leu or p.Val263Gly mutations (P=0.004). Using a Cox proportional hazards model, we found that the homozygous c.689_690insT mutation was associated with an increased risk for onset of gait disturbance (adjusted hazard ratio: 6.60) and for the inability to walk without assistance (adjusted hazard ratio: 2.99). All patients homozygous for the c.689_690insT mutation presented ocular motor apraxia at <15 years of age. Approximately half the patients homozygous for the c.689_690insT mutation developed cognitive impairment. In contrast, in the patients with p.Pro206Leu or p.Val263Gly mutations, only ∼50% of the patients exhibited ocular motor apraxia and they never developed cognitive impairment. The stepwise multivariate regression analysis using sex, age and the number of c.689_690insT alleles as independent variables revealed that the number of c.689_690insT alleles was independently and negatively correlated with median motor nerve conduction velocities, ulnar motor nerve conduction velocities and values of serum albumin. In the patient with c.[689_690insT]+[840delT], p.[Pro206Leu]+[Pro206Leu] and p.[Pro206Leu]+[Val263Gly] mutations, aprataxin proteins were not detected by an antibody to the N-terminus of aprataxin. Furthermore Pro206Leu and Val263Gly aprataxin proteins are unstable. However, the amount of the 689_690insT aprataxin messenger RNA was also decreased, resulting in more dramatic reduction in the amount of aprataxin protein from the c.689_690insT allele. In conclusion, patients with early onset ataxia with ocular motor apraxia and hypoalbuminaemia homozygous for the c.689_690insT mutation show a more severe phenotype than those with a p.Pro206Leu or p.Val263Gly mutation.

    DOI: 10.1093/brain/awr069

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  • Increased TGF-beta Signaling Underlies the Pathogenesis of Cerebral Autosomal Recessive Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CARASIL) 査読

    Hiroaki Nozaki, Atushi Shiga, Hirotoshi Kawata, Kunimasa Arima, Kenju Hara, Toshio Fukutake, Akio Yokoseki, Akihide Koyama, Toshiaki Takahashi, Mari Ikeda, Akira Tanaka, Imaharu Nakano, Shu-ichi Ikeda, Tadashi Yamamoto, Takeshi Ikeuchi, Masatoyo Nishizawa, Shoji Tsuji, Osamu Onodera

    NEUROLOGY74 ( 9 ) A445 - A445   2010年3月

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    記述言語:英語   出版者・発行元:LIPPINCOTT WILLIAMS & WILKINS  

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  • Association of HTRA1 mutations and familial ischemic cerebral small-vessel disease. 査読 国際誌

    Kenju Hara, Atsushi Shiga, Toshio Fukutake, Hiroaki Nozaki, Akinori Miyashita, Akio Yokoseki, Hirotoshi Kawata, Akihide Koyama, Kunimasa Arima, Toshiaki Takahashi, Mari Ikeda, Hiroshi Shiota, Masato Tamura, Yutaka Shimoe, Mikio Hirayama, Takayo Arisato, Sohei Yanagawa, Akira Tanaka, Imaharu Nakano, Shu-ichi Ikeda, Yutaka Yoshida, Tadashi Yamamoto, Takeshi Ikeuchi, Ryozo Kuwano, Masatoyo Nishizawa, Shoji Tsuji, Osamu Onodera

    The New England journal of medicine360 ( 17 ) 1729 - 39   2009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:MASSACHUSETTS MEDICAL SOC  

    BACKGROUND: The genetic cause of cerebral autosomal recessive arteriopathy with subcortical infarcts and leukoencephalopathy (CARASIL), which is characterized by ischemic, nonhypertensive, cerebral small-vessel disease with associated alopecia and spondylosis, is unclear. METHODS: In five families with CARASIL, we carried out linkage analysis, fine mapping of the region implicated in the disease, and sequence analysis of a candidate gene. We also conducted functional analysis of wild-type and mutant gene products and measured the signaling by members of the transforming growth factor beta (TGF-beta) family and gene and protein expression in the small arteries in the cerebrum of two patients with CARASIL. RESULTS: We found linkage of the disease to the 2.4-Mb region on chromosome 10q, which contains the HtrA serine protease 1 (HTRA1) gene. HTRA1 is a serine protease that represses signaling by TGF-beta family members. Sequence analysis revealed two nonsense mutations and two missense mutations in HTRA1. The missense mutations and one of the nonsense mutations resulted in protein products that had comparatively low levels of protease activity and did not repress signaling by the TGF-beta family. The other nonsense mutation resulted in the loss of HTRA1 protein by nonsense-mediated decay of messenger RNA. Immunohistochemical analysis of the cerebral small arteries in affected persons showed increased expression of the extra domain-A region of fibronectin and versican in the thickened tunica intima and of TGF-beta1 in the tunica media. CONCLUSIONS: CARASIL is associated with mutations in the HTRA1 gene. Our findings indicate a link between repressed inhibition of signaling by the TGF-beta family and ischemic cerebral small-vessel disease, alopecia, and spondylosis.

    DOI: 10.1056/NEJMoa0801560

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  • TDP-43 mutation in familial amyotrophic lateral sclerosis. 査読 国際誌

    Akio Yokoseki, Atsushi Shiga, Chun-Feng Tan, Asako Tagawa, Hiroyuki Kaneko, Akihide Koyama, Hiroto Eguchi, Akira Tsujino, Takeshi Ikeuchi, Akiyoshi Kakita, Koichi Okamoto, Masatoyo Nishizawa, Hitoshi Takahashi, Osamu Onodera

    Annals of neurology63 ( 4 ) 538 - 42   2008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:WILEY-LISS  

    Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder. Accumulating evidence has shown that 43kDa TAR-DNA-binding protein (TDP-43) is the disease protein in ALS and frontotemporal lobar degeneration. We previously reported a familial ALS with Bumina bodies and TDP-43-positive skein-like inclusions in the lower motor neurons; these findings are indistinguishable from those of sporadic ALS. In three affected individuals in two generations of one family, we found a single base-pair change from A to G at position 1028 in TDP-43, which resulted in a Gln-to-Arg substitution at position 343. Our findings provide a new insight into the molecular pathogenesis of ALS.

    DOI: 10.1002/ana.21392

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  • TDP-43 mutation in familial amyotrophic lateral sclerosis 査読

    Akio Yokoseki, Atsushi Shiga, Chun Feng Tan, Asako Tagawa, Hiroyuki Kaneko, Akihide Koyama, Hiroto Eguchi, Akira Tsujino, Takeshi Ikeuchi, Akiyoshi Kakita, Koichi Okamoto, Masatoyo Nishizawa, Hitoshi Takahashi, Osamu Onodera

    NEUROSCIENCE RESEARCH61   S267 - S267   2008年

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    記述言語:英語   出版者・発行元:ELSEVIER IRELAND LTD  

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  • Aprataxin, causative gene product for EAOH/AOA1, repairs DNA single-strand breaks with damaged 3'-phosphate and 3'-phosphoglycolate ends. 査読 国際誌

    Tetsuya Takahashi, Masayoshi Tada, Shuichi Igarashi, Akihide Koyama, Hidetoshi Date, Akio Yokoseki, Atsushi Shiga, Yutaka Yoshida, Shoji Tsuji, Masatoyo Nishizawa, Osamu Onodera

    Nucleic acids research35 ( 11 ) 3797 - 809   2007年

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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  

    Aprataxin is the causative gene product for early-onset ataxia with ocular motor apraxia and hypoalbuminemia/ataxia with oculomotor apraxia type 1 (EAOH/AOA1), the clinical symptoms of which are predominantly neurological. Although aprataxin has been suggested to be related to DNA single-strand break repair (SSBR), the physiological function of aprataxin remains to be elucidated. DNA single-strand breaks (SSBs) continually produced by endogenous reactive oxygen species or exogenous genotoxic agents, typically possess damaged 3'-ends including 3'-phosphate, 3'-phosphoglycolate, or 3'-alpha, beta-unsaturated aldehyde ends. These damaged 3'-ends should be restored to 3'-hydroxyl ends for subsequent repair processes. Here we demonstrate by in vitro assay that recombinant human aprataxin specifically removes 3'-phosphoglycolate and 3'-phosphate ends at DNA 3'-ends, but not 3'-alpha, beta-unsaturated aldehyde ends, and can act with DNA polymerase beta and DNA ligase III to repair SSBs with these damaged 3'-ends. Furthermore, disease-associated mutant forms of aprataxin lack this removal activity. The findings indicate that aprataxin has an important role in SSBR, that is, it removes blocking molecules from 3'-ends, and that the accumulation of unrepaired SSBs with damaged 3'-ends underlies the pathogenesis of EAOH/AOA1. The findings will provide new insight into the mechanism underlying degeneration and DNA repair in neurons.

    DOI: 10.1093/nar/gkm158

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MISC

  • C9-ALS/FTDモデルショウジョウバエにおけるリピート関連非ATG翻訳の制御

    上山 盛夫, 石黒 太郎, Gendron Tania F, 今野 卓哉, 小山 哲秀, 和田 圭司, 石川 欣也, 小野寺 理, Petrucelli Leonard, 永井 義隆

    Dementia Japan33 ( 4 ) 551 - 551   2019年10月

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    記述言語:日本語   出版者・発行元:(一社)日本認知症学会  

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  • IDH変異型グリオーマの診断と術中治療―コラボレーションを通して実現を目指す―

    棗田学, 阿部英明, 岡田正康, 五十嵐博中, 中田力, 小山哲秀, 小野寺理, 柿田明美, 大石誠, 藤井幸彦

    日本蛋白質科学会年会プログラム・要旨集18th   25   2018年5月

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    記述言語:日本語  

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  • 家族性脳小血管病患者で報告された変異型HTRA1蛋白質の機能解析

    上村 昌寛, 野崎 洋明, 加藤 泰介, 小山 哲秀, 小野寺 理

    生命科学系学会合同年次大会2017年度   [1P - 1241]   2017年12月

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    記述言語:英語   出版者・発行元:生命科学系学会合同年次大会運営事務局  

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  • 家族性脳小血管病患者で報告された変異型HTRA1蛋白質の機能解析

    上村 昌寛, 野崎 洋明, 加藤 泰介, 小山 哲秀, 小野寺 理

    生命科学系学会合同年次大会2017年度   [1P - 1241]   2017年12月

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    記述言語:英語   出版者・発行元:生命科学系学会合同年次大会運営事務局  

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  • ALS原因遺伝子TDP-43の点変異によるアレル特異的遺伝子発現の変化

    須貝 章弘, 廣川 祥子, 小山 哲秀, 今野 卓哉, 小野寺 理

    生命科学系学会合同年次大会2017年度   [3P - 1118]   2017年12月

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    記述言語:日本語   出版者・発行元:生命科学系学会合同年次大会運営事務局  

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  • RVCL関連変異の細胞内局在についての検討

    笠原 杏子, 加藤 泰介, 野崎 洋明, 小山 哲秀, 小野寺 理

    Dementia Japan31 ( 4 ) 572 - 572   2017年10月

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    記述言語:日本語   出版者・発行元:(一社)日本認知症学会  

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  • SMN遺伝子欠失は日本における下位運動ニューロン疾患の発症リスクと関連する(SMN gene deletion is associated with developing risk of lower motor neuron disease in Japan)

    豊田 佐織, 石原 智彦, 小山 哲秀, 西澤 正豊, 小野寺 理

    臨床神経学56 ( Suppl. ) S230 - S230   2016年12月

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    記述言語:英語   出版者・発行元:(一社)日本神経学会  

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  • Toxicity of dipeptide repeat proteins in C9 ALS/FTD model fly

    Morio Ueyama, Taro Ishiguro, Tania F. Gendron, Nobuhiro Fujikake, Takuya Konno, Akihide Koyama, Osamu Onodera, Kinya Ishikawa, Keiji Wada, Leonard Petrucelli, Yoshitaka Nagai

    GENES & GENETIC SYSTEMS91 ( 6 ) 365 - 365   2016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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  • Establishment of a novel animal model of ALS/FTD expressing G4C2 repeat RNA in Drosophila

    Morio Ueyama, Taro Ishiguro, Nobuhiro Fujikake, Takuya Konno, Akihide Koyama, Osamu Onodera, Keiji Wada, Yoshitaka Nagai

    GENES & GENETIC SYSTEMS90 ( 6 ) 366 - 366   2015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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  • HDLSはCSF-1Rの機能喪失で生じる シグナル伝達障害とハプロ不全

    勇 亜衣子, 今野 卓哉, 他田 正義, 他田 真理, 小山 哲秀, 野崎 洋明, 金田 大太, 田代 裕一, 山本 徹, 高橋 均, 西澤 正豊, 小野寺 理, 柿田 明美, 池内 健

    臨床神経学54 ( Suppl. ) S8 - S8   2014年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • Establishment of a novel animal model of AILS expressing GGGGCC repeat RNA in Drosophila

    Morio Ueyama, Taro Ishiguro, Nobuhiro Fujikake, Takuya Konno, Akihide Koyama, Osamu Onodera, Keiji Wada, Yoshitaka Nagai

    GENES & GENETIC SYSTEMS89 ( 6 ) 334 - 334   2014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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  • ALS関連TARDBP遺伝子変異は自身の選択的スプライシングに影響をおよぼすか?

    今野 卓哉, 小山 哲秀, 逸見 文昭, 小山 美咲, 須貝 章弘, 加藤 泰介, 石原 智彦, 西澤 正豊, 小野寺 理

    臨床神経学54 ( Suppl. ) S200 - S200   2014年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • TDP-43発現低下時におけるミトコンドリア・ダイナミクスの検討

    伊藤 岳, 小山 哲秀, 有泉 優子, 西澤 正豊, 小野寺 理

    臨床神経学54 ( Suppl. ) S200 - S200   2014年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • 核内TDP-43減少は細胞質内TDP-43 mRNA増加をもたらす

    須貝 章弘, 小山 哲秀, 加藤 泰介, 今野 卓哉, 石原 智彦, 西澤 正豊, 小野寺 理

    臨床神経学54 ( Suppl. ) S62 - S62   2014年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • ALSでのStasimonヒトホモログmRNAのスプライシング異常の検討

    石原 智彦, 志賀 篤, 小山 哲秀, 柿田 明美, 西澤 正豊, 高橋 均, 小野寺 理

    臨床神経学54 ( Suppl. ) S99 - S99   2014年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • HTRA1変異ヘテロ接合者における脳小血管病の発症機序

    野崎 洋明, 加藤 泰介, 齊藤 洋兵, 小山 哲秀, 西澤 正豊, 小野寺 理

    Dementia Japan28 ( 4 ) 475 - 475   2014年10月

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    記述言語:日本語   出版者・発行元:(一社)日本認知症学会  

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  • Dominant negative効果をもつ変異型HTRA1はヘテロ接合体でも脳小血管病を引き起こす

    野崎 洋明, 斉藤 洋平, 二本松 萌, 小山 哲秀, 加藤 泰介, 西澤 正豊, 小野寺 理

    臨床神経学53 ( 12 ) 1540 - 1540   2013年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • TDP-43量はTDP-43に惹起される自己mRNAのスプライシングで制御される

    須貝 章弘, 小山 哲秀, 今野 卓哉, 加藤 泰介, 西澤 正豊, 小野寺 理

    臨床神経学53 ( 12 ) 1411 - 1411   2013年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • 神経軸索スフェロイドを伴う白質脳症HDLSの臨床・遺伝学的解析

    他田 正義, 今野 卓哉, 他田 真理, 荒川 武蔵, 小山 哲秀, 野崎 洋明, 針谷 康夫, 西宮 仁, 松永 晶子, 米田 誠, 吉倉 延亮, 犬塚 貴, 石原 健司, 河村 満, 高橋 均, 小野寺 理, 西澤 正豊, 池内 健

    臨床神経学53 ( 12 ) 1529 - 1529   2013年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • 筋萎縮性側索硬化症の脊髄前角細胞におけるCajal小体数の減少

    横関 明男, 譚 春鳳, 石原 智彦, 志賀 篤, 小山 哲秀, 佐藤 達哉, 高橋 均, 西澤 正豊, 小野寺 理

    臨床神経学53 ( 12 ) 1568 - 1568   2013年12月

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    記述言語:日本語   出版者・発行元:(一社)日本神経学会  

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  • 神経軸索スフェロイドを伴う白質脳症HDLSにおけるCSF1Rシグナル伝達異常の解析

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  • 疾患関連変異型アプラタキシンの核小体局在障害とその機序の解明

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  • AOA1/EAOHの病態機序における核小体局在の意義

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    臨床神経学47 ( 12 ) 1131 - 1131   2007年12月

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  • γセクレターゼによるインスリン受容体の膜内切断および細胞内局在の検討

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    臨床神経学47 ( 12 ) 1011 - 1011   2007年12月

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  • Aprataxin, the causative gene product for AOA1/EAOH, repairs damaged 3'-ends of DNA single strand breaks

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  • Aprataxin(APTX)のDNA損傷ストレスにおける核内局在の変化に関する検討

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  • アプラタキシンのRNAに対する機能の解析

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    臨床神経学46 ( 12 ) 1148 - 1148   2006年12月

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  • Presenilin/γ-secretaseによるインスリン受容体の切断および細胞内局在に及ぼす影響

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    Dementia Japan20 ( 2 ) 172 - 172   2006年8月

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  • Aprataxin(APTX)の生理機能 細胞内局在の検討

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    臨床神経学45 ( 12 ) 1103 - 1103   2005年12月

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  • aprataxinはDNA修復において校正機能を担うのか?

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    臨床神経学45 ( 12 ) 1103 - 1103   2005年12月

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  • 脊髄小脳変性症はapratoxinというタンパク質をつくるが,これは3'-5'エキソヌクレアーゼである(Spinocerebellar degeneration caused protein, aprataxin, is a 3'-5' exonuclease)

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受賞

  • ワークショップ 若手優秀発表賞

    2013年9月   包括型脳科学研究推進支援ネットワーク  

    小山哲秀

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