研究者詳細 - 石浦　浩之

論文 - 石浦　浩之

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Biallelic variants in DNAJC7 cause familial amyotrophic lateral sclerosis with the TDP-43 pathology. 査読国際誌

Toru Yamashita, Osamu Yokota, Daiki Ousaka, Hongming Sun, Takashi Haraguchi, Ricardo Satoshi Ota-Elliott, Chika Matsuoka, Tomohito Kawano, Hanae Nakashima-Yasuda, Yusuke Fukui, Yumiko Nakano, Ryuta Morihara, Masato Hasegawa, Yasuyuki Hosono, Seishi Terada, Manabu Takaki, Hiroyuki Ishiura

Acta neuropathologica 150 ( 1 ) 19 - 19 2025年8月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder characterized by the progressive degeneration of motor neurons. ALS pathology primarily involves the failure of protein quality control mechanisms, leading to the accumulation of misfolded proteins, particularly TAR DNA-binding protein 43 (TDP-43). TDP-43 aggregation is a central pathological feature of ALS. Maintaining protein homeostasis is critical and facilitated by heat shock proteins (HSPs), particularly the HSP40 family, which includes co-chaperones such as DNAJC7. Here, we report a family with three siblings affected by ALS who carry a homozygous c.518dupC frameshift variant in DNAJC7, a member of the HSP40 family. All three patients exhibited progressive muscle weakness, limb atrophy, bulbar palsy, and respiratory failure. Pathological examination revealed degeneration of both upper and lower motor neurons, with phosphorylated TDP-43-positive neuronal cytoplasmic inclusions in the frontal and temporal cortices. Immunoblot analysis were consistent with a type B pattern of phosphorylated TDP-43 in the precentral gyrus. Immunohistochemistry and RNA sequencing analyses demonstrated a substantial reduction in DNAJC7 expression at both the protein and RNA levels in affected brain regions. In a TDP-43 cell model, DNAJC7 knockdown impaired the disassembly of TDP-43 following arsenite-induced stress, whereas DNAJC7 overexpression suppressed the assembly and promoted the disassembly of arsenite-induced TDP-43 condensates. Furthermore, in a zebrafish ALS model, dnajc7 knockdown resulted in increased TDP-43 aggregation in motor neurons and reduced survival. To the best of our knowledge, this study provides the first evidence linking biallelic loss-of-function variants in DNAJC7 to familial ALS with TDP-43 pathology.

DOI： 10.1007/s00401-025-02899-y

Two Cases of Autosomal Recessive Spinocerebellar Ataxia-8 Showing Two Novel Variants of SYNE1 in Japanese Families. 査読

Taijun Yunoki, Chika Matsuoka, Yosuke Osakada, Yusuke Fukui, Mami Takemoto, Ryuta Morihara, Toru Yamashita, Hiroyuki Ishiura

Internal medicine (Tokyo, Japan) 2025年6月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Autosomal recessive spinocerebellar ataxia-8 (SCAR8) is a neurodegenerative disorder caused by the biallelic pathogenic variants of SYNE1. It is characterized by slowly progressive cerebellar ataxia and atrophy. We identified two SCAR8 families using exome analyses and two novel variants, c.2127delG (p.Met709Ilefs) and c.15943G>T (p.Gly5315*), in SYNE1 (NM_182961.4). Pathogenic variants of SYNE1 cause various symptoms, including cerebellar ataxia, pyramidal tract disorders, and joint disorders, and the pathogenic variants discovered in this study were located in a region prone to cerebellar ataxia.

DOI： 10.2169/internalmedicine.5602-25

Identification of New Repeat Expansion Diseases 招待査読

Hiroyuki Ishiura

Neurology and Clinical Neuroscience 13 ( 4 ) 244 - 249 2025年5月

担当区分：筆頭著者,　最終著者,　責任著者掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

ABSTRACT

Through a genetic study of benign adult familial myoclonus epilepsy (BAFME) type 1, TTTCA and TTTTA repeat expansions have been identified in intron 4 of SAMD12. Lengths of expanded repeats inversely correlated with age at onset of epilepsy. Gain‐of‐toxic function mechanisms are suggested by the presence of UUUCA‐repeat‐containing RNA foci. From families with BAFME who did not have repeat expansions in SAMD12, we identified expanded TTTCA and TTTTA repeats in TNRC6A and RAPGEF2. These findings indicated a strong correlation between the repeat motif and the phenotype, leading to the identification of other types of BAFME. We then conducted genetic analysis of neuronal intranuclear inclusion disease (NIID), oculopharyngeal myopathy with leukoencephalopathy (OPML), and oculopharyngodistal myopathy (OPDM). From the observation that NIID, OPML, and OPDM, in addition to fragile X‐associated tremor/ataxia syndrome, have shared clinical features, a direct search for CGG repeat expansions successfully led to the identification of the causative genes. Here, I review recent studies on repeat expansions.

DOI： 10.1111/ncn3.70022

Recent progress in oculopharyngodistal myopathy research from clinical and genetic viewpoints. 招待査読国際誌

Hiroyuki Ishiura

Journal of neuromuscular diseases 22143602251319164 - 22143602251319164 2025年3月

担当区分：筆頭著者,　最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Oculopharyngodistal myopathy (OPDM) is a rare muscular disorder characterized by ocular symptoms, pharyngeal symptoms, facial weakness, and distal predominant limb muscle weakness. The cause of the disease was unknown for a long time. Recently, however, it has been reported that expansions of CGG or CCG repeats in LRP12, LOC642361/NUTM2B-AS1, GIPC1, NOTCH2NLC, RILPL1, and ABCD3 are the causes of the disease. Cases sometimes present with neurological symptoms, and the clinical spectrum of diseases caused by expansions of CGG or CCG repeats has been proposed to be called FNOP-spectrum disorder after the names of fragile X-associated tremor/ataxia syndrome, neuronal intranuclear inclusion disease, oculopharyngeal myopathy with leukoencephalopathy, and OPDM. In this article, the recent progress in the field of OPDM is reviewed, and remaining issues in OPDM are discussed.

DOI： 10.1177/22143602251319164

Long-Term Follow-Up of a Patient With SPG11 査読

Yosuke Osakada, Taijun Yunoki, Chika Matsuoka, Yusuke Fukui, Keiichiro Tsunoda, Kentaro Deguchi, Ryuta Morihara, Toru Yamashita, Hiroyuki Ishiura

Neurology and Clinical Neuroscience 13 ( 3 ) 198 - 200 2025年1月

担当区分：最終著者,　責任著者掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

ABSTRACT

We present a case of a male patient with disease‐causing variants in SPG11, a causative gene for autosomal recessive spastic paraplegia with a thin corpus callosum (ARHSP‐TCC), as well as juvenile amyotrophic lateral sclerosis (ALS5) and Charcot–Marie–Tooth disease (CMT2X). A neurological examination at age 18 revealed dysarthria, muscle weakness in bilateral lower extremities, hyperreflexia in patellar reflex, hyporeflexia in Achilles reflex with an extensor plantar reflex, and intellectual disability. Magnetic resonance imaging revealed a thin corpus callosum and ears of the lynx sign. At the age of 26, weakness and muscle atrophy progressed. While no sensory disturbances were noted, there was a mild decrease in sensory nerve action potentials of the sural nerve over the 8 years between 18 and 26. Clinicians should be aware that SPG11 belongs to the same spectrum of disorders as ALS5 and CMT2X and presents various phenotypes depending on the stage of the disease.

DOI： 10.1111/ncn3.12874

Late-onset MELAS: a case report of mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes in a 55-year-old patient 査読

Taira Yuki, Toru Yamashita, Ryuta Morihara, Taijun Yunoki, Chika Matsuoka, Kawano Tomohito, Yusuke Fukui, Hiroyuki Ishiura

Vas-Cog Journal 11 44 - 47 2025年

A Novel De Novo Variant in KCNH5 in a Patient with Refractory Epileptic Encephalopathy. 査読

Akihiko Mitsutake, Takashi Matsukawa, Tatsuhiko Naito, Hiroyuki Ishiura, Jun Mitsui, Hiroaki Harada, Keishi Fujio, Jun Fujishiro, Harushi Mori, Shinichi Morishita, Shoji Tsuji, Tatsushi Toda

Internal medicine (Tokyo, Japan) 2024年8月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

We herein report a novel de novo KCNH5 variant in a patient with refractory epileptic encephalopathy. The patient exhibited seizures at 1 year and 7 months old, which gradually worsened, leading to a bedridden status. Brain magnetic resonance imaging (MRI) showed cerebral atrophy and cerebellar hypoplasia. A trio whole-exome sequence analysis identified a de novo heterozygous c.640A>C, p.Lys214Gln variant in KCNH5 that was predicted to be deleterious. Recent studies have linked KCNH5 to various epileptic encephalopathies, with many patients showing normal MRI findings. The present case expands the clinical spectrum of the disease, as it is characterized by severe neurological prognosis, cerebral atrophy, and cerebellar hypoplasia.

DOI： 10.2169/internalmedicine.3999-24

Neurological disorders caused by novel non-coding repeat expansions: clinical features and differential diagnosis. 査読国際誌

Elisa Vegezzi, Hiroyuki Ishiura, D Cristopher Bragg, David Pellerin, Francesca Magrinelli, Riccardo Currò, Stefano Facchini, Arianna Tucci, John Hardy, Nutan Sharma, Matt C Danzi, Stephan Zuchner, Bernard Brais, Mary M Reilly, Shoji Tsuji, Henry Houlden, Andrea Cortese

The Lancet. Neurology 23 ( 7 ) 725 - 739 2024年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

Nucleotide repeat expansions in the human genome are a well-known cause of neurological disease. In the past decade, advances in DNA sequencing technologies have led to a better understanding of the role of non-coding DNA, that is, the DNA that is not transcribed into proteins. These techniques have also enabled the identification of pathogenic non-coding repeat expansions that cause neurological disorders. Mounting evidence shows that adult patients with familial or sporadic presentations of epilepsy, cognitive dysfunction, myopathy, neuropathy, ataxia, or movement disorders can be carriers of non-coding repeat expansions. The description of the clinical, epidemiological, and molecular features of these recently identified non-coding repeat expansion disorders should guide clinicians in the diagnosis and management of these patients, and help in the genetic counselling for patients and their families.

DOI： 10.1016/S1474-4422(24)00167-4

RFC1-related disorder presenting recurrent syncope. 査読国際誌

Yoko Tsuboyama, Akiko Takahashi, Sawako Furukawa, Asem Almansour, Masashi Hamada, Akatsuki Kubota, Jun Shimizu, Makoto Kinoshita, Chisato Fujimoto, Jun Mitsui, Takashi Matsukawa, Hiroya Naruse, Hiroyuki Ishiura, Shoji Tsuji, Tatsushi Toda

Journal of neurology 271 ( 7 ) 4635 - 4638 2024年3月

SPTLC2 variants are associated with early-onset ALS and FTD due to aberrant sphingolipid synthesis. 査読国際誌

Hiroya Naruse, Hiroyuki Ishiura, Kayoko Esaki, Jun Mitsui, Wataru Satake, Peter Greimel, Nanoka Shingai, Yuka Machino, Yasumasa Kokubo, Hirotoshi Hamaguchi, Tetsuya Oda, Tomoko Ikkaku, Ichiro Yokota, Yuji Takahashi, Yuta Suzuki, Takashi Matsukawa, Jun Goto, Kishin Koh, Yoshihisa Takiyama, Shinichi Morishita, Takeo Yoshikawa, Shoji Tsuji, Tatsushi Toda

Annals of clinical and translational neurology 11 ( 4 ) 946 - 957 2024年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: Amyotrophic lateral sclerosis (ALS) is a devastating, incurable neurodegenerative disease. A subset of ALS patients manifests with early-onset and complex clinical phenotypes. We aimed to elucidate the genetic basis of these cases to enhance our understanding of disease etiology and facilitate the development of targeted therapies. METHODS: Our research commenced with an in-depth genetic and biochemical investigation of two specific families, each with a member diagnosed with early-onset ALS (onset age of <40 years). This involved whole-exome sequencing, trio analysis, protein structure analysis, and sphingolipid measurements. Subsequently, we expanded our analysis to 62 probands with early-onset ALS and further included 440 patients with adult-onset ALS and 1163 healthy controls to assess the prevalence of identified genetic variants. RESULTS: We identified heterozygous variants in the serine palmitoyltransferase long chain base subunit 2 (SPTLC2) gene in patients with early-onset ALS. These variants, located in a region closely adjacent to ORMDL3, bear similarities to SPTLC1 variants previously implicated in early-onset ALS. Patients with ALS carrying these SPTLC2 variants displayed elevated plasma ceramide levels, indicative of increased serine palmitoyltransferase (SPT) activity leading to sphingolipid overproduction. INTERPRETATION: Our study revealed novel SPTLC2 variants in patients with early-onset ALS exhibiting frontotemporal dementia. The combination of genetic evidence and the observed elevation in plasma ceramide levels establishes a crucial link between dysregulated sphingolipid metabolism and ALS pathogenesis. These findings expand our understanding of ALS's genetic diversity and highlight the distinct roles of gene defects within SPT subunits in its development.

DOI： 10.1002/acn3.52013

Expanded clinical spectrum of oculopharyngodistal myopathy type 1 査読

Takahiro Shimizu, Hiroyuki Ishiura, Manato Hara, Shota Shibata, Atsushi Unuma, Akatsuki Kubota, Kaori Sakuishi, Kiyoharu Inoue, Jun Goto, Yuji Takahashi, Yuichiro Shirota, Masashi Hamada, Jun Shimizu, Shoji Tsuji, Tatsushi Toda

Muscle & Nerve 2022年9月

Isolated Paravermal Hyperintensities in Neuronal Intranuclear Inclusion Disease. 査読国際誌

Ryo Tokimura, Meiko Hashimoto, Akihiko Mitsutake, Souichi Sakai, Fumio Suzuki, Keiko Sugasawa, Chisato Fujimoto, Hiroyuki Ishiura, Tatsushi Toda

Neurology 98 ( 22 ) 938 - 939 2022年3月

Clinicopathologic Features of Oculopharyngodistal Myopathy With LRP12 CGG Repeat Expansions Compared With Other Oculopharyngodistal Myopathy Subtypes. 国際誌

Theerawat Kumutpongpanich, Masashi Ogasawara, Ayami Ozaki, Hiroyuki Ishiura, Shoji Tsuji, Narihiro Minami, Shinichiro Hayashi, Satoru Noguchi, Aritoshi Iida, Ichizo Nishino, Madoka Mori-Yoshimura, Yasushi Oya, Kenjiro Ono, Toshio Shimizu, Akihiro Kawata, Shun Shimohama, Keiko Toyooka, Kaoru Endo, Shuta Toru, Oga Sasaki, Kenji Isahaya, Masanori P Takahashi, Kazuo Iwasa, Jun-Ichi Kira, Tatsuya Yamamoto, Michi Kawamoto, Tadanori Hamano, Kazuma Sugie, Nobuyuki Eura, Tomo Shiota, Mizuho Koide, Kanako Sekiya, Hideaki Kishi, Takuto Hideyama, Shigeru Kawai, Satoshi Yanagimoto, Hiroyasu Sato, Hajime Arahata, Shigeo Murayama, Kayoko Saito, Hideo Hara, Takashi Kanda, Hiroshi Yaguchi, Noboru Imai, Yuichi Kawagashira, Mitsuru Sanada, Kazuki Obara, Misako Kaido, Minori Furuta, Takashi Kurashige, Wataru Hara, Daisuke Kuzume, Mamoru Yamamoto, Jun Tsugawa, Hitaru Kishida, Naoki Ishizuka, Kohei Morimoto, Yukio Tsuji, Atsuko Tsuneyama, Atsuhiro Matsuno, Ryo Sasaki, Daigo Tamakoshi, Erika Abe, Shinichiro Yamada, Akiyuki Uzawa

JAMA neurology 78 ( 7 ) 853 - 863 2021年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

Importance: Repeat expansion of CGG in LRP12 has been identified as the causative variation of oculopharyngodistal myopathy (OPDM). However, to our knowledge, the clinicopathologic features of OPDM with CGG repeat expansion in LRP12 (hereafter referred to as OPDM_LRP12) remain unknown. Objective: To identify and characterize the clinicopathologic features of patients with OPDM_LRP12. Design, Setting, and Participants: This case series included 208 patients with a clinical or clinicopathologic diagnosis of oculopharyngeal muscular dystrophy (OPDM) from January 1, 1978, to December 31, 2020. Patients with GCN repeat expansions in PABPN1 were excluded from the study. Repeat expansions of CGG in LRP12 were screened by repeat primed polymerase chain reaction and/or Southern blot. Main Outcomes and Measures: Clinical information, muscle imaging data obtained by either computed tomography or magnetic resonance imaging, and muscle pathologic characteristics. Results: Sixty-five Japanese patients with OPDM (40 men [62%]; mean [SD] age at onset, 41.0 [10.1] years) from 59 families with CGG repeat expansions in LRP12 were identified. This represents the most common OPDM subtype among all patients in Japan with genetically diagnosed OPDM. The expansions ranged from 85 to 289 repeats. A negative correlation was observed between the repeat size and the age at onset (r2 = 0.188, P = .001). The most common initial symptoms were ptosis and muscle weakness, present in 24 patients (37%). Limb muscle weakness was predominantly distal in 53 of 64 patients (83%), but 2 of 64 patients (3%) had predominantly proximal muscle weakness. Ptosis was observed in 62 of 64 patients (97%), and dysphagia or dysarthria was observed in 63 of 64 patients (98%). A total of 21 of 64 patients (33%) had asymmetric muscle weakness. Aspiration pneumonia was seen in 11 of 64 patients (17%), and 5 of 64 patients (8%) required mechanical ventilation. Seven of 64 patients (11%) developed cardiac abnormalities, and 5 of 64 patients (8%) developed neurologic abnormalities. Asymmetric muscle involvement was detected on computed tomography scans in 6 of 27 patients (22%) and on magnetic resonance imaging scans in 4 of 15 patients (27%), with the soleus and the medial head of the gastrocnemius being the worst affected. All 42 muscle biopsy samples showed rimmed vacuoles. Intranuclear tubulofilamentous inclusions were observed in only 1 of 5 patients. Conclusions and Relevance: This study suggests that OPDM_LRP12 is the most frequent OPDM subtype in Japan and is characterized by oculopharyngeal weakness, distal myopathy that especially affects the soleus and gastrocnemius muscles, and rimmed vacuoles in muscle biopsy.

DOI： 10.1001/jamaneurol.2021.1509

Loss-of-function variants in NEK1 are associated with an increased risk of sporadic ALS in the Japanese population. 国際誌

Hiroya Naruse, Hiroyuki Ishiura, Jun Mitsui, Yuji Takahashi, Takashi Matsukawa, Jun Yoshimura, Koichiro Doi, Shinichi Morishita, Jun Goto, Tatsushi Toda, Shoji Tsuji

Journal of human genetics 66 ( 3 ) 237 - 241 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

Loss-of-function (LoF) variants in NEK1 have recently been reported to be associated with amyotrophic lateral sclerosis (ALS). In this study, we investigated the association of NEK1 LoF variants with an increased risk of sporadic ALS (SALS) and the clinical characteristics of patients with SALS carrying LoF variants in a Japanese case series. Whole-exome sequencing analysis was performed for a series of 446 SALS patients in whom pathogenic variants in familial ALS-causative genes have not been identified and 1163 healthy control subjects in our Japanese series. We evaluated LoF variants, defined as nonsense, splice-site disrupting single-nucleotide variants (SNVs), or short insertion/deletion (indel) variants predicted to cause frameshifts in NEK1. We identified seven NEK1 LoF variants in patients with SALS (1.57%), whereas only one was identified in control subjects (0.086%) (P = 0.00073, Fisher's exact test). This finding is consistent with those in recent reports from other regions in the world. In conclusion, we demonstrated that NEK1 LoF variants are also associated with an increased risk of SALS in the Japanese population.

DOI： 10.1038/s10038-020-00830-9

Splice-site mutations in KIF5A in the Japanese case series of amyotrophic lateral sclerosis. 国際誌

Hiroya Naruse, Hiroyuki Ishiura, Jun Mitsui, Yuji Takahashi, Takashi Matsukawa, Kaori Sakuishi, Kiyotaka Nakamagoe, Zenshi Miyake, Akira Tamaoka, Jun Goto, Jun Yoshimura, Koichiro Doi, Shinichi Morishita, Tatsushi Toda, Shoji Tsuji

Neurogenetics 22 ( 1 ) 11 - 17 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

Our objective was to investigate the frequency of KIF5A variants in amyotrophic lateral sclerosis (ALS) and the clinical characteristics of familial ALS (FALS) associated with variants in KIF5A. Whole-exome sequence analysis was performed for a Japanese series of 43 families with FALS and 444 patients with sporadic ALS (SALS), in whom causative variants had not been identified. We compared the frequencies of rare variants (MAF < 0.01) in KIF5A, including missense and loss of function (LoF) variants, between ALS and control subjects (n = 1163). Clinical characteristics of patients with FALS carrying pathogenic variants in KIF5A were also described. LoF variants were identified only in the probands of two families with FALS, both of which were 3' splice-site variants leading to exon skipping and an altered C-terminal domain, located in the mutational hotspot causing FALS, and were considered to be pathogenic for FALS. Rare missense variants in KIF5A were identified in five patients with SALS (1.13%) and 11 control subjects (0.95%, carrier frequency), which were not significantly different. Consequently, the pathogenic LoF variants in KIF5A accounted for 2.1% of all FALS families in this study. These patients suffered from ALS characteristically associated with the predominant involvement of upper motor neuron. In conclusion, we identified two pathogenic splice-site variants in KIF5A in the probands in two Japanese families with FALS, which altered the C-terminal region of KIF5A. Our findings broaden the phenotype spectrum of ALS associated with variants in KIF5A in the Japanese series.

DOI： 10.1007/s10048-020-00626-1

SPG9A with the new occurrence of an ALDH18A1 mutation in a CMT1A family with PMP22 duplication: case report. 国際誌

Kishin Koh, Ryusuke Takaki, Hiroyuki Ishiura, Shoji Tsuji, Yoshihisa Takiyama

BMC neurology 21 ( 1 ) 64 - 64 2021年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: ALDH18A1 mutations lead to delta-1-pyrroline-5-carboxylate-synthetase (P5CS) deficiency, which is a urea cycle-related disorder including SPG9A, SPG9B, autosomal dominant cutis laxa-3 (ADCL3), and autosomal recessive cutis laxa type 3A (ARCL3A). These diseases exhibit a broad clinical spectrum, which makes the diagnosis of P5CS deficiency difficult. We report here a rare Japanese family including both patients with an ALDH18A1 mutation (SPG9A) and ones with CMT1A. CASE PRESENTATION: A Japanese family included five patients with the CMT phenotype and five with the HSP phenotype in four generations. The patients with the HSP phenotype showed a pure or complicated form, and intrafamilial clinical variability was noted. Genetically, FISH analysis revealed that two CMT patients had a PMP22 duplication (CMT1A). Exome analysis and Sanger sequencing revealed five HSP patients had an ALDH18A1 heterozygous mutation of c.755G > A, which led to SPG9A. Haplotype analysis revealed that the ALDH18A1 mutation must have newly occurred. To date, although de novo mutations of ALDH18A1 have been described in ADCL3A, they were not mentioned in SPG9A in earlier reports. Thus, this is the first SPG9A family with a de novo mutation or the new occurrence of gonadal mosaicism of ALDH18A1. Analysis of serum amino acid levels revealed that two SPG9A patients and two unaffected family members had low citrulline levels and one had a low level of ornithine. CONCLUSIONS: Since the newly occurring ALDH18A1 mutation, c.755G > A, is the same as that in two ADHSP families and one sporadic patient with SPG9A reported previously, this genomic site might easily undergo mutation. The patients with the c.755G > A mutation in our family showed clinical variability of symptoms like in the earlier reported two families and one sporadic patient with this mutation. Further studies are required to clarify the relationship between the amino acid levels and clinical manifestations, which will reveal how P5CS deficiency influences disease phenotypes including ARCL3A, ADCL3, SPG9B, and SPG9A.

DOI： 10.1186/s12883-021-02087-x

Cerebellar Ataxia as a Common Clinical Presentation Associated with DNMT1 p.Y511H and a Review of the Literature. 国際誌

Junko Kanda Kikuchi, Yu Nagashima, Tatsuo Mano, Hiroyuki Ishiura, Toshihiro Hayashi, Jun Shimizu, Takashi Matsukawa, Yaeko Ichikawa, Yuji Takahashi, Shotaro Karino, Takashi Kanbayashi, Junichi Kira, Jun Goto, Shoji Tsuji

Journal of molecular neuroscience : MN 71 ( 9 ) 1796 - 1801 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

The phenotypes of patients with disease-associated variants in DNMT1 have been classified into two syndromes: hereditary sensory and autonomic neuropathy type 1E (HSAN1E, MIM614116, https://www.omim.org/ ) and autosomal dominant cerebellar ataxia, deafness, and narcolepsy (ADCA-DN, MIM604121). The amino acid codon 511 is a hotspot, and p.Y511C is the most frequently observed disease-associated variant among those in HSAN1E patients, whereas there have been only a few reports on patients with p.Y511H. In this study, we report on the cases of a kindred carrying the DNMT1 variant NM_001130823.2:c.1531 T > C (p.Y511H) presenting with the ADCA-DN phenotype. The review of the literature further revealed that later ages at onset and the presence of cerebellar ataxia are the main characteristics of patients carrying the DNMT1 p.Y511H as compared with those carrying DNMT1 p.Y511C. Although HSAN1E and ADCA-DN are proposed to be called DNMT1-complex disorders owing to their overlapping symptoms, this finding suggests a distinct genotype-phenotype correlation regarding the DNMT1 p.Y511H and p.Y511C variants.

DOI： 10.1007/s12031-020-01784-5

Advances in repeat expansion diseases and a new concept of repeat motif-phenotype correlation. 国際誌

Hiroyuki Ishiura, Shoji Tsuji

Current opinion in genetics & development 65 176 - 185 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Recently repeat expansions have been found in more than 10 diseases in the past two years. Because the same repeat motifs are found in similar disease (as exemplified by benign adult familial myoclonic epilepsy) or in diseases with overlapping phenotype (as exemplified by fragile X tremor/ataxia syndrome, neuronal intranuclear inclusion disease, oculopharyngeal myopathy with leukoencephalopathy, and oculopharyngodistal myopathy), we propose a new concept of 'repeat motif-phenotype correlation', which argue for toxic gain-of-function mechanism caused by expanded repeats, rather than altered functions of genes harboring expanded repeats. The concept is expected to help identify repeat expansions taking the similar or overlapping clinical presentations as the clues. Although repeat expansions have been identified predominantly in autosomal dominant diseases, recent progresses have demonstrated that they are also observed in autosomal recessive diseases. Furthermore, repeat expansions are not infrequently observed in patients without family histories, which urges us to pay attention to sporadic diseases. We should expand our views toward repeat expansion diseases to accelerate discovery of diseases caused by repeat expansions, better understanding the disease mechanisms, and development of therapeutic measures.

DOI： 10.1016/j.gde.2020.05.029

Juvenile amyotrophic lateral sclerosis with complex phenotypes associated with novel SYNE1 mutations. 国際誌

Hiroya Naruse, Hiroyuki Ishiura, Jun Mitsui, Yuji Takahashi, Takashi Matsukawa, Tatsushi Toda, Shoji Tsuji

Amyotrophic lateral sclerosis & frontotemporal degeneration 22 ( 7-8 ) 1 - 3 2020年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

Mutations in SYNE1 have been originally described to cause a slowly progressive, pure cerebellar ataxia (spinocerebellar ataxia, autosomal-recessive 8; SCAR8). Notably, recent studies revealed that affected patients with SYNE1-associated ataxia can present with complex phenotypes rather than pure cerebellar ataxia, including motor neuron and brainstem dysfunctions. We herein report a Japanese patient diagnosed with juvenile amyotrophic lateral sclerosis (ALS) with a complex phenotype, who carried compound heterozygous pathogenic variants in SYNE1. Of the variants, one was a novel frameshift variant and the other was a nonsense variant previously reported as pathogenic for SCAR8. The patient showed an early age at onset with a relatively slow but progressive course of ALS, accompanied by cognitive decline. Our findings suggest that the clinical spectrum of patients carrying pathogenic SYNE1 variants is broader than expected, and SYNE1 variants should be considered in patients diagnosed with juvenile ALS, even without prominent cerebellar ataxia.

DOI： 10.1080/21678421.2020.1813312

Adult-onset neuronal intranuclear inclusion disease mimicking Fragile X-associated tremor-ataxia syndrome in ethnic Chinese patients. 査読国際誌

Shen-Yang Lim, Hiroyuki Ishiura, Norlisah Ramli, Shota Shibata, M Asem Almansour, Ai Huey Tan, Henry Houlden, Anthony E Lang, Shoji Tsuji

Parkinsonism & related disorders 74 25 - 27 2020年4月

記述言語：英語

Two ethnic Chinese men with clinico-radiologic features of Fragile X-associated tremor-ataxia syndrome (FXTAS) were found on genetic testing to have neuronal intranuclear inclusion disease (NIID), highlighting that NIID should be considered in the differential diagnosis of FXTAS. NIID may also be much more common than FXTAS in certain Asian populations.

DOI： 10.1016/j.parkreldis.2020.03.025

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11
12