研究者詳細 - 石浦　浩之

論文 - 石浦　浩之

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SLC4A4 compound heterozygous mutations in exon-intron boundary regions presenting with severe proximal renal tubular acidosis and extrarenal symptoms coexisting with Turner's syndrome: a case report. 査読国際誌

Shoko Horita, Enver Simsek, Tulay Simsek, Nilgun Yildirim, Hiroyuki Ishiura, Motonobu Nakamura, Nobuhiko Satoh, Atsushi Suzuki, Hiroyuki Tsukada, Tomohito Mizuno, George Seki, Shoji Tsuji, Masaomi Nangaku

BMC medical genetics 19 ( 1 ) 103 - 103 2018年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Congenital NBCe1A deficiency with the SLC4A4 mutation causes severe proximal renal tubular acidosis, which often comprises extrarenal symptoms, such as intellectual disability and developmental delay, glaucoma, cataract and band keratopathy. To date, almost all mutations have been found to be homozygous mutations located in exons. CASE PRESENTATION: We performed direct nucleotide sequencing analysis of exons and exon-intron boundary regions of the SLC4A4 in a patient presenting with severe renal proximal tubule acidosis, glaucoma and intellectual disability and her parents without these signs. The examination revealed compound heterozygous mutations in exon-intron boundary regions, c.1076 + 3A > C and c.1772 - 2A > T, neither of which have been reported previously. While the former mutation was found in the mother, the latter was found in the father. The transcript of the SLC4A4 gene was almost undetectable, and the patient was also diagnosed with Turner's syndrome. CONCLUSIONS: We identified two novel SLC4A4 mutations, c.1076 + 3A > C and c.1772 - 2A > T. When presented in a compound heterozygous state, these mutations caused a phenotype of severe renal proximal tubular acidosis along with glaucoma and mental retardation. This is the first report of congenital proximal renal tubular acidosis carrying compound heterozygous SLC4A4 mutations in exon-intron boundary regions. We suggest that an mRNA surveillance mechanism, nonsense-mediated RNA decay, following aberrant splicing was the reason that the SLC4A4 transcript was almost undetectable in the proband.

DOI： 10.1186/s12881-018-0612-y

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Mutations in COA7 cause spinocerebellar ataxia with axonal neuropathy. 査読国際誌

Yujiro Higuchi, Ryuta Okunushi, Taichi Hara, Akihiro Hashiguchi, Junhui Yuan, Akiko Yoshimura, Kei Murayama, Akira Ohtake, Masahiro Ando, Yu Hiramatsu, Satoshi Ishihara, Hajime Tanabe, Yuji Okamoto, Eiji Matsuura, Takehiro Ueda, Tatsushi Toda, Sumimasa Yamashita, Kenichiro Yamada, Takashi Koide, Hiroaki Yaguchi, Jun Mitsui, Hiroyuki Ishiura, Jun Yoshimura, Koichiro Doi, Shinichi Morishita, Ken Sato, Masanori Nakagawa, Masamitsu Yamaguchi, Shoji Tsuji, Hiroshi Takashima

Brain : a journal of neurology 141 ( 6 ) 1622 - 1636 2018年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

Several genes related to mitochondrial functions have been identified as causative genes of neuropathy or ataxia. Cytochrome c oxidase assembly factor 7 (COA7) may have a role in assembling mitochondrial respiratory chain complexes that function in oxidative phosphorylation. Here we identified four unrelated patients with recessive mutations in COA7 among a Japanese case series of 1396 patients with Charcot-Marie-Tooth disease (CMT) or other inherited peripheral neuropathies, including complex forms of CMT. We also found that all four patients had characteristic neurological features of peripheral neuropathy and ataxia with cerebellar atrophy, and some patients showed leukoencephalopathy or spinal cord atrophy on MRI scans. Validated mutations were located at highly conserved residues among different species and segregated with the disease in each family. Nerve conduction studies showed axonal sensorimotor neuropathy. Sural nerve biopsies showed chronic axonal degeneration with a marked loss of large and medium myelinated fibres. An immunohistochemical assay with an anti-COA7 antibody in the sural nerve from the control patient showed the positive expression of COA7 in the cytoplasm of Schwann cells. We also observed mildly elevated serum creatine kinase levels in all patients and the presence of a few ragged-red fibres and some cytochrome c oxidase-negative fibres in a muscle biopsy obtained from one patient, which was suggestive of subclinical mitochondrial myopathy. Mitochondrial respiratory chain enzyme assay in skin fibroblasts from the three patients showed a definitive decrease in complex I or complex IV. Immunocytochemical analysis of subcellular localization in HeLa cells indicated that mutant COA7 proteins as well as wild-type COA7 were localized in mitochondria, which suggests that mutant COA7 does not affect the mitochondrial recruitment and may affect the stability or localization of COA7 interaction partners in the mitochondria. In addition, Drosophila COA7 (dCOA7) knockdown models showed rough eye phenotype, reduced lifespan, impaired locomotive ability and shortened synaptic branches of motor neurons. Our results suggest that loss-of-function COA7 mutation is responsible for the phenotype of the presented patients, and this new entity of disease would be referred to as spinocerebellar ataxia with axonal neuropathy type 3.

DOI： 10.1093/brain/awy104

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Intronic pentanucleotide TTTCA repeat insertion in the SAMD12 gene causes familial cortical myoclonic tremor with epilepsy type 1. 査読

Cen Z, Jiang Z, Chen Y, Zheng X, Xie F, Yang X, Lu X, Ouyang Z, Wu H, Chen S, Yin H, Qiu X, Wang S, Ding M, Tang Y, Yu F, Li C, Wang T, Ishiura H, Tsuji S, Jiao C, Liu C, Xiao J, Luo W

Brain : a journal of neurology 141 ( 8 ) 2280 - 2288 2018年6月

HIV Dementia with a Decreased Cardiac ¹²³I-metaiodobenzylguanidine Uptake Masquerading as Dementia with Lewy Bodies. 査読

Kurihara M, Sasaki T, Ishiura H, Tsuji S

Internal medicine (Tokyo, Japan) 57 ( 20 ) 3007 - 3010 2018年5月

Optineurin pathology in the spinal cord of amyotrophic lateral sclerosis/parkinsonism-dementia complex patients in Kii Peninsula, Japan. 査読国際誌

Satoru Morimoto, Hiroyuki Hatsuta, Rie Motoyama, Yasumasa Kokubo, Hiroyuki Ishiura, Shoji Tsuji, Shigeki Kuzuhara, Shigeo Murayama

Brain pathology (Zurich, Switzerland) 28 ( 3 ) 422 - 426 2018年5月

Novel De Novo KCND3 Mutation in a Japanese Patient with Intellectual Disability, Cerebellar Ataxia, Myoclonus, and Dystonia 査読

Masanori Kurihara, Hiroyuki Ishiura, Takuya Sasaki, Juuri Otsuka, Toshihiro Hayashi, Yasuo Terao, Takashi Matsukawa, Jun Mitsui, Juntaro Kaneko, Kazutoshi Nishiyama, Koichiro Doi, Jun Yoshimura, Shinichi Morishita, Jun Shimizu, Shoji Tsuji

Cerebellum 17 ( 2 ) 237 - 242 2018年4月

Frequency and characteristics of the TBK1 gene variants in Japanese patients with sporadic amyotrophic lateral sclerosis. 査読国際誌

Genki Tohnai, Ryoichi Nakamura, Jun Sone, Masahiro Nakatochi, Daichi Yokoi, Masahisa Katsuno, Hazuki Watanabe, Hirohisa Watanabe, Mizuki Ito, Yuanzhe Li, Yuishin Izumi, Mitsuya Morita, Akira Taniguchi, Osamu Kano, Masaya Oda, Satoshi Kuwabara, Koji Abe, Ikuko Aiba, Koichi Okamoto, Kouichi Mizoguchi, Kazuko Hasegawa, Masashi Aoki, Nobutaka Hattori, Osamu Onodera, Hiroya Naruse, Jun Mitsui, Yuji Takahashi, Jun Goto, Hiroyuki Ishiura, Shinichi Morishita, Jun Yoshimura, Koichiro Doi, Shoji Tsuji, Kenji Nakashima, Ryuji Kaji, Naoki Atsuta, Gen Sobue

Neurobiology of aging 64 158.e15-158.e19 - 158.e19 2018年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

Amyotrophic lateral sclerosis (ALS) is a devastating neurological disease, and the etiology of sporadic ALS is generally unknown. The TANK-binding kinase 1 (TBK1) gene was identified as an ALS gene contributing to a predisposition toward ALS. To reveal the frequency and characteristics of variants of the TBK1 gene in sporadic ALS patients in Japan, we analyzed the TBK1 gene by exome sequencing in a large Japanese cohort of 713 sporadic ALS patients and 800 controls. We identified known or potentially toxic rare variants of TBK1 gene in 9 patients (1.26%) with sporadic ALS, including 4 novel missense variants (p.V23I, p.H322R, p.R358C, and p.T478I) and 3 loss-of-function variants (p.R357X, p.P378_I379del, and p.T419_G420del). The odds ratio between sporadic ALS patients and controls was 10.2 (p = 0.008, 95% confidence interval = 1.67-62.47). These findings support the contribution of TBK1 to the etiology of sporadic ALS in Japanese patients.

DOI： 10.1016/j.neurobiolaging.2017.12.005

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A Homozygous LAMA2 Mutation of c.818G>A Caused Partial Merosin Deficiency in a Japanese Patient. 査読

Akatsuki Kubota, Hiroyuki Ishiura, Jun Mitsui, Kaori Sakuishi, Atsushi Iwata, Tomotaka Yamamoto, Ichizo Nishino, Shoji Tsuji, Jun Shimizu

Internal medicine (Tokyo, Japan) 57 ( 6 ) 877 - 882 2018年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

A complete loss of merosin, which is encoded by LAMA2, causes congenital muscular dystrophy with leukoencephalopathy. Partial merosin deficiency can be caused not only by primarily LAMA2 mutations, but also secondarily by dystroglycanopathy. Although it can be molecularly diagnosed based on a genetic analysis, this method is labor-intensive because of its huge genome size. A 26-year-old male patient presented with mild muscular weakness, joint contractures, and epilepsy. Double immunofluorescence staining of a muscle biopsy specimen showed mislocalization of merosin, and a genetic analysis revealed a homozygous c.818G>A (p.Arg273Lys) mutation in LAMA2. Double immunofluorescence staining and whole exome sequencing were useful for the diagnosis of partial merosin deficiency.

DOI： 10.2169/internalmedicine.9588-17

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Clinical and genetic features of Charcot-Marie-Tooth disease 2F and hereditary motor neuropathy 2B in Japan 査読

Hajime Tanabe, Yujiro Higuchi, Jun-Hui Yuan, Akihiro Hashiguchi, Akiko Yoshimura, Satoshi Ishihara, Satoshi Nozuma, Yuji Okamoto, Eiji Matsuura, Hiroyuki Ishiura, Jun Mitsui, Ryotaro Takashima, Norito Kokubun, Kengo Maeda, Yuri Asano, Yoko Sunami, Yu Kono, Yasunori Ishigaki, Shosaburo Yanamoto, Jiro Fukae, Hiroshi Kida, Mitsuya Morita, Shoji Tsuji, Hiroshi Takashima

Journal of the Peripheral Nervous System 23 ( 1 ) 40 - 48 2018年3月

Authors’ reply to the Drs. Finsterer and Zarrouk-Mahjoub's comments for our case report 査読

Eisuke Amiya, Hiroyuki Morita, Hiroyuki Ishiura, Shoji Tsuji, Issei Komuro

International Journal of Cardiology 254 262 2018年3月

Identification of candidate genes involved in the etiology of sporadic Tourette syndrome by exome sequencing 査読

Yosuke Eriguchi, Hitoshi Kuwabara, Aya Inai, Yuki Kawakubo, Fumichika Nishimura, Chihiro Kakiuchi, Mamoru Tochigi, Jun Ohashi, Naoto Aoki, Kayoko Kato, Hiroyuki Ishiura, Jun Mitsui, Shoji Tsuji, Koichiro Doi, Jun Yoshimura, Shinichi Morishita, Takafumi Shimada, Masaomi Furukawa, Tadashi Umekage, Tsukasa Sasaki, Kiyoto Kasai, Yukiko Kano

AMERICAN JOURNAL OF MEDICAL GENETICS PART B-NEUROPSYCHIATRIC GENETICS 174 ( 7 ) 712 - 723 2017年10月

Structural Basis and Genotype-Phenotype Correlations of INSR Mutations Causing Severe Insulin Resistance 査読

Jun Hosoe, Hiroko Kadowaki, Fuyuki Miya, Katsuya Aizu, Tomoyuki Kawamura, Ichiro Miyata, Kenichi Satomura, Takeru Ito, Kazuo Hara, Masaki Tanaka, Hiroyuki Ishiura, Shoji Tsuji, Ken Suzuki, Minaka Takakura, Keith A. Boroevich, Tatsuhiko Tsunoda, Toshimasa Yamauchi, Nobuhiro Shojima, Takashi Kadowaki

DIABETES 66 ( 10 ) 2713 - 2723 2017年10月

New familial amyotrophic lateral sclerosis with benign progression and myoclonus in lower extremities 査読

Togawa J, Ohi T, Yuan JH, Takashima H, Furuya H, Takechi S, Fujitake J, Hayashi S, Ishiura H, Naruse H, Mitsui J, Tsuji S

J. Neurol. Sci. 381 ( Supplement ) 716 2017年10月

Clinical and mutational spectrum of Charcot-Marie-Tooth disease type 2Z caused by MORC2 variants in Japan 査読

M. Ando, Y. Okamoto, A. Yoshimura, J. -H. Yuan, Y. Hiramatsu, Y. Higuchi, A. Hashiguchi, J. Mitsui, H. Ishiura, S. Fukumura, M. Matsushima, N. Ochi, J. Tsugawa, S. Morishita, S. Tsuji, H. Takashima

EUROPEAN JOURNAL OF NEUROLOGY 24 ( 10 ) 1274 - 1282 2017年10月

Clinicopathologic features of myositis patients with CD8-MHC-1 complex pathology 査読

Chiseko Ikenaga, Akatsuki Kubota, Masato Kadoya, Kenichiro Taira, Naohiro Uchio, Ayumi Hida, Meiko Hashimoto Maeda, Yu Nagashima, Hiroyuki Ishiura, Kenichi Kaida, Jun Goto, Shoji Tsuji, Jun Shimizu

NEUROLOGY 89 ( 10 ) 1060 - 1068 2017年9月

Clinical and mutational spectrum of Japanese patients with Charcot-Marie-Tooth disease caused by GDAP1 variants 査読

A. Yoshimura, J. -H. Yuan, A. Hashiguchi, Y. Hiramatsu, M. Ando, Y. Higuchi, T. Nakamura, Y. Okamoto, K. Matsumura, T. Hamano, N. Sawaura, Y. Shimatani, S. Kumada, Y. Okumura, J. Miyahara, Y. Yamaguchi, S. Kitamura, K. Haginoya, J. Mitsui, H. Ishiura, S. Tsuji, H. Takashima

CLINICAL GENETICS 92 ( 3 ) 274 - 280 2017年9月

Clinical and genetic diversities of Charcot-Marie-Tooth disease with MFN2 mutations in a large case study 査読

Masahiro Ando, Akihiro Hashiguchi, Yuji Okamoto, Akiko Yoshimura, Yu Hiramatsu, Junhui Yuan, Yujiro Higuchi, Jun Mitsui, Hiroyuki Ishiura, Ayako Umemura, Koichi Maruyama, Takeshi Matsushige, Shinichi Morishita, Masanori Nakagawa, Shoji Tsuji, Hiroshi Takashima

JOURNAL OF THE PERIPHERAL NERVOUS SYSTEM 22 ( 3 ) 191 - 199 2017年9月

Novel mutation in the membrane metalloendopeptidase gene in a patient with the autosomal recessive form of Charcot-Marie-Tooth disease 査読

Ishiura Hiroyuki, Mitsui Jun, Yoshimura Jun, Doi Koichiro, Morishita Shinichi, Hamada Masashi, Goto Jun, Tsuji Shoji

NEUROLOGY AND CLINICAL NEUROSCIENCE 5 ( 4 ) 124 - 126 2017年7月

Three-Year Follow-Up of High-Dose Ubiquinol Supplementation in a Case of Familial Multiple System Atrophy with Compound Heterozygous COQ2 Mutations 査読

Jun Mitsui, Ken Koguchi, Toshimitsu Momose, Miwako Takahashi, Takashi Matsukawa, Tsutomu Yasuda, Shin-ichi Tokushige, Hiroyuki Ishiura, Jun Goto, Shigeaki Nakazaki, Tomoyoshi Kondo, Hidefumi Ito, Yorihiro Yamamoto, Shoji Tsuji

CEREBELLUM 16 ( 3 ) 664 - 672 2017年6月

Ataxic form of autosomal recessive PEX10-related peroxisome biogenesis disorders with a novel compound heterozygous gene mutation and characteristic clinical phenotype 査読

Toru Yamashita, Jun Mitsui, Nobuyuki Shimozawa, Shigeo Takashima, Hiroshi Umemura, Kota Sato, Mami Takemoto, Nozomi Hishikawa, Yasuyuki Ohta, Takashi Matsukawa, Hiroyuki Ishiura, Jun Yoshimura, Koichiro Doi, Shinichi Morishita, Shoji Tsuji, Koji Abe

JOURNAL OF THE NEUROLOGICAL SCIENCES 375 424 - 429 2017年4月

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