Faculty Profiles - Ishiura Hiroyuki

Papers - Ishiura Hiroyuki

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Identification of a novel mutation in ATP13A2 associated with a complicated form of hereditary spastic paraplegia. International journal

Yasuko Odake, Kishin Koh, Yoshihisa Takiyama, Hiroyuki Ishiura, Shoji Tsuji, Masahito Yamada, Mitsuhiro Yoshita

Neurology. Genetics 6 ( 5 ) e514 2020.10

Language：English Publishing type：Research paper (scientific journal)

Objective: To establish molecular diagnosis for a family with a complicated form of autosomal recessive hereditary spastic paraplegia with intellectual disability, cognitive decline, psychosis, peripheral neuropathy, upward gaze palsy, and thin corpus callosum (TCC). Methods: Physical examinations, laboratory tests, structural neuroimaging studies, and exome sequence analysis were carried out. Results: The 3 patients exhibited intellectual disability and progressive intellectual decline accompanied by psychiatric symptoms. Gait difficulty with spasticity and pyramidal weakness appeared at the ages of 20s-30s. Brain MRI revealed TCC with atrophic changes in the frontotemporal lobes, caudate nuclei, and cerebellum. Exome sequence analysis revealed a novel homozygous c.2654C>A (p. Ala885Asp) variant in the ATP13A2, a gene responsible for a complicated form of hereditary spastic paraplegia (SPG78), Kufor-Rakeb syndrome, and neuronal ceroid lipofuscinosis. The predominant clinical presentations of the patients include progressive intellectual disability and gait difficulty with spasticity and pyramidal weakness, consistent with the diagnosis of SPG78. Of note, prominent psychiatric symptoms and extrapyramidal signs including rigidity, dystonia, and involuntary movements preceded the spastic paraparesis. Conclusions: Our study further broadens the clinical spectrum associated with ATP13A2 mutations.

DOI： 10.1212/NXG.0000000000000514

Clinical Characteristics of Neuronal Intranuclear Inclusion Disease-Related Retinopathy With CGG Repeat Expansions in the NOTCH2NLC Gene

Natsuko Nakamura, Kazushige Tsunoda, Akihiko Mitsutake, Shota Shibata, Tatsuo Mano, Yu Nagashima, Hiroyuki Ishiura, Atsushi Iwata, Tatsushi Toda, Shoji Tsuji, Hiromasa Sawamura

Investigative ophthalmology & visual science 61 ( 11 ) 27 2020.9

A novel mutation in ABCD1 gene in a Filipino patient with adult‐onset X‐linked ALD

Kristine Joyce Porto, Takashi Matsukawa, Hiroyuki Ishiura, Jun Mitsui, Alexandria Matic, Justine Megan Yu, Jacqueline Dominguez, Ludwig Damian, Tatsushi Toda, Shoji Tsuji

Neurology and Clinical Neuroscience 8 ( 5 ) 329 - 331 2020.9

Comprehensive investigation of RNF213 nonsynonymous variants associated with intracranial artery stenosis. Reviewed International journal

Hiroki Hongo, Satoru Miyawaki, Hideaki Imai, Masahiro Shimizu, Shinichi Yagi, Jun Mitsui, Hiroyuki Ishiura, Jun Yoshimura, Koichiro Doi, Wei Qu, Yu Teranishi, Atsushi Okano, Hideaki Ono, Hirofumi Nakatomi, Tsuneo Shimizu, Shinichi Morishita, Shoji Tsuji, Nobuhito Saito

Scientific reports 10 ( 1 ) 11942 - 11942 2020.7

Language：English Publishing type：Research paper (scientific journal)

Intracranial artery stenosis (ICAS) is the most common cause of ischemic stroke worldwide. RNF213 single nucleotide variant c.14429G > A (p.Arg4810Lys, rs112735431) was recently reported to be associated with ICAS in East Asians. However, the disease susceptibility of other RNF213 variants has not been clarified. This study comprehensively investigated ICAS-associated RNF213 variants in a pool of 168 Japanese ICAS patients and 1,194 control subjects. We found 138 nonsynonymous germline variants by target resequencing of all coding exons in RNF213. Association study between ICAS patients and control subjects revealed that only p.Arg4810Lys had significant association with ICAS (P = 1.5 × 10-28, odds ratio = 29.3, 95% confidence interval 15.31-56.2 [dominant model]). Fourteen of 138 variants were rare variants detected in ICAS patients not harboring p.Arg4810Lys variant. Two of these rare variants (p.Cys118Arg and p.Leu2356Phe) consistent with variants previously reported in moyamoya disease patients characterized by stenosis of intracranial artery and association with RNF213, and three rare variants (p.Ser193Gly, p.Val1817Leu, and p.Asp3329Tyr) were found neither in control subjects and Single Nucleotide Polymorphism Database. The present findings may improve our understanding of the genetic background of intracranial artery stenosis.

DOI： 10.1038/s41598-020-68888-1

Selective impairment of On-reading (Chinese-style pronunciation) in alexia with agraphia for kanji due to subcortical hemorrhage in the left posterior middle temporal gyrus Reviewed

Mizuho Yoshida, Toshihiro Hayashi, Kurumi Fujii, Hiroyuki Ishiura, Shoji Tsuji, Yasuhisa Sakurai

Neurocase 26 ( 4 ) 220 - 226 2020.7

A novel mutation in the GBA2 gene in a Japanese patient with SPG46: A case report

Keiko Nakamura-Shindo, Kenjiro Ono, Kishin Koh, Hiroyuki Ishiura, Shoji Tsuji, Yoshihisa Takiyama, Masahito Yamada

eNeurologicalSci 19 2020.6

Clinical features of inherited neuropathy with BSCL2 mutations in Japan. Reviewed International journal

Satoshi Ishihara, Yuji Okamoto, Hajime Tanabe, Akiko Yoshimura, Yujiro Higuchi, Jun-Hui Yuan, Akihiro Hashiguchi, Hiroyuki Ishiura, Jun Mitsui, Shugo Suwazono, Yasushi Oya, Masayuki Sasaki, Masanori Nakagawa, Shoji Tsuji, Yusuke Ohya, Hiroshi Takashima

Journal of the peripheral nervous system : JPNS 25 ( 2 ) 125 - 131 2020.6

Language：English Publishing type：Research paper (scientific journal)

Heterozygous mutations in the Berardinelli-Seip congenital lipodystrophy 2 (BSCL2) gene have been reported with different clinical phenotypes including Silver syndrome (SS)/spastic paraplegia 17 (SPG17), distal hereditary motor neuropathy type V (dHMN-V), and Charcot-Marie-Tooth (CMT) disease type 2. We screened 407 Japanese patients who were clinically suspected of having CMT by exome sequencing and searched mutations in BSCL2. As a result, we identified five patients with heterozygous mutations in BSCL2. We confirmed three cases of known mutations (p.N88S and p.S90L) and two cases of novel mutations (p.N88T and p.S141A). The clinical features of the cases with known mutations in Japan were similar to those previously reported in other countries. In particular, there were many cases with sensory disturbance. The case with p.N88T mutation showed severe phenotype such as early onset age and prominent vocal cord paresis. The case with p.S141A mutation showed characteristics of demyelinating neuropathy such as CMT disease type 1 by electrophysiological examination. In this article, we report the clinical features and spread of cases with BSCL2 mutation in a Japanese cohort.

DOI： 10.1111/jns.12369

Clinical efficacy of haematopoietic stem cell transplantation for adult adrenoleukodystrophy. Reviewed International journal

Takashi Matsukawa, Tomotaka Yamamoto, Akira Honda, Takashi Toya, Hiroyuki Ishiura, Jun Mitsui, Masaki Tanaka, Akihito Hao, Akihito Shinohara, Mizuki Ogura, Keisuke Kataoka, Sachiko Seo, Keiki Kumano, Masataka Hosoi, Kensuke Narukawa, Megumi Yasunaga, Hiroaki Maki, Motoshi Ichikawa, Yasuhito Nannya, Yoichi Imai, Tsuyoshi Takahashi, Yuji Takahashi, Yuki Nagasako, Kyoko Yasaka, Kagari Koshi Mano, Miho Kawabe Matsukawa, Toji Miyagawa, Masashi Hamada, Kaori Sakuishi, Toshihiro Hayashi, Atsushi Iwata, Yasuo Terao, Jun Shimizu, Jun Goto, Harushi Mori, Akira Kunimatsu, Shigeki Aoki, Shin Hayashi, Fumihiko Nakamura, Syunya Arai, Kazunari Momma, Katsuhisa Ogata, Toshikazu Yoshida, Osamu Abe, Johji Inazawa, Tatsushi Toda, Mineo Kurokawa, Shoji Tsuji

Brain communications 2 ( 1 ) fcz048 2020

Language：English Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

Accumulated experience supports the efficacy of allogenic haematopoietic stem cell transplantation in arresting the progression of childhood-onset cerebral form of adrenoleukodystrophy in early stages. For adulthood-onset cerebral form of adrenoleukodystrophy, however, there have been only a few reports on haematopoietic stem cell transplantation and the clinical efficacy and safety of that for adulthood-onset cerebral form of adrenoleukodystrophy remain to be established. To evaluate the clinical efficacy and safety of haematopoietic stem cell transplantation, we conducted haematopoietic stem cell transplantation on 12 patients with adolescent-/adult-onset cerebral form/cerebello-brainstem form of adrenoleukodystrophy in a single-institution-based prospective study. Through careful prospective follow-up of 45 male adrenoleukodystrophy patients, we aimed to enrol patients with adolescent-/adult-onset cerebral form/cerebello-brainstem form of adrenoleukodystrophy at early stages. Indications for haematopoietic stem cell transplantation included cerebral form of adrenoleukodystrophy or cerebello-brainstem form of adrenoleukodystrophy with Loes scores up to 13, the presence of progressively enlarging white matter lesions and/or lesions with gadolinium enhancement on brain MRI. Clinical outcomes of haematopoietic stem cell transplantation were evaluated by the survival rate as well as by serial evaluation of clinical rating scale scores and neurological and MRI findings. Clinical courses of eight patients who did not undergo haematopoietic stem cell transplantation were also evaluated for comparison of the survival rate. All the patients who underwent haematopoietic stem cell transplantation survived to date with a median follow-up period of 28.6 months (4.2-125.3 months) without fatality. Neurological findings attributable to cerebral/cerebellar/brainstem lesions became stable or partially improved in all the patients. Gadolinium-enhanced brain lesions disappeared or became obscure within 3.5 months and the white matter lesions of MRI became stable or small. The median Loes scores before haematopoietic stem cell transplantation and at the last follow-up visit were 6.0 and 5.25, respectively. Of the eight patients who did not undergo haematopoietic stem cell transplantation, six patients died 69.1 months (median period; range 16.0-104.1 months) after the onset of the cerebral/cerebellar/brainstem lesions, confirming that the survival probability was significantly higher in patients with haematopoietic stem cell transplantation compared with that in patients without haematopoietic stem cell transplantation (P = 0.0089). The present study showed that haematopoietic stem cell transplantation was conducted safely and arrested the inflammatory demyelination in all the patients with adolescent-/adult-onset cerebral form/cerebello-brainstem form of adrenoleukodystrophy when haematopoietic stem cell transplantation was conducted in the early stages. Further studies are warranted to optimize the procedures of haematopoietic stem cell transplantation for adolescent-/adult-onset cerebral form/cerebello-brainstem form of adrenoleukodystrophy.

DOI： 10.1093/braincomms/fcz048

VPS13D-related disorders presenting as a pure and complicated form of hereditary spastic paraplegia. Reviewed International journal

Kishin Koh, Hiroyuki Ishiura, Haruo Shimazaki, Michiko Tsutsumiuchi, Yuta Ichinose, Haitian Nan, Shun Hamada, Toshihisa Ohtsuka, Shoji Tsuji, Yoshihisa Takiyama

Molecular genetics & genomic medicine e1108 2019.12

Language：English

BACKGROUND: Alterations of vacuolar protein sorting-associated protein 13 (VPS13) family members including VPS13A, VPS13B, and VPS13C lead to chorea acanthocytosis, Cohen syndrome, and parkinsonism, respectively. Recently, VPS13D mutations were identified as a cause of VPS13D-related movement disorders, which show several phenotypes including chorea, dystonia, spastic ataxia, and spastic paraplegia. METHODS: We applied whole-exome analysis for a patient with a complicated form of hereditary spastic paraplegia (HSP) and her unaffected parents. Then, we screened the candidate genes in 664 Japanese families with HSP in Japan. RESULTS: We first found a compound heterozygote VPS13D mutation and a heterozygote ABHD4 variation in a sporadic patient with spastic paraplegia. Then, we found three patients with VPS13D mutations in two Japanese HSP families. The three patients with homozygous mutations (p.Thr1118Met/p.Thr1118Met and p.Thr2945Ala/p.Thr2945Ala) in the VPS13D showed an adult onset pure form of HSP. Meanwhile, the patient with a compound heterozygous mutation (p.Ser405Arg/p.Arg3141Ter) in the VPS13D showed a childhood onset complicated form of HSP associated with cerebellar ataxia, cervical dystonia, cataracts, and chorioretinal dystrophy. CONCLUSION: In the present study, we found four patients in three Japanese families with novel VPS13D mutations, which may broaden the clinical and genetic findings for VPS13D-related disorders.

DOI： 10.1002/mgg3.1108

Spastic Paraplegia Accompanied by Extrapyramidal Sign and Frontal Cognitive Dysfunction. Reviewed

Ryo Sasaki, Yasuyuki Ohta, Kota Sato, Koh Tadokoro, Yoshiaki Takahashi, Jingwei Shang, Mami Takemoto, Nozomi Hishikawa, Toru Yamashita, Hiroyuki Ishiura, Shoji Tsuji, Koji Abe

Internal medicine (Tokyo, Japan) 58 ( 21 ) 3163 - 3165 2019.11

Language：English Publishing type：Research paper (scientific journal)

A complicated form of spastic paraplegia is a neurodegenerative disorder presenting as progressive spasticity in the bilateral lower limbs accompanied by some clinical features. The present case showed spastic paralysis and hyperreflexia in all extremities as well as lead pipe rigidity in the neck and bilateral upper extremities (R < L), decreased scores on frontal cognitive tests, a decreased accumulation of the right dorsal putamen on a DAT scan, and hypoperfusion of the bilateral frontal lobes on 99mTc-ECD single photon emission computed tomography (SPECT). The present case provides a new spectrum of spastic paraplegia based on the evidence of clinical scores and the findings of brain functional imaging.

DOI： 10.2169/internalmedicine.2765-19

UBAP1 mutations cause juvenile-onset hereditary spastic paraplegias (SPG80) and impair UBAP1 targeting to endosomes. Reviewed International journal

Haitian Nan, Yuta Ichinose, Masaki Tanaka, Kishin Koh, Hiroyuki Ishiura, Jun Mitsui, Heisuke Mizukami, Masafumi Morimoto, Shun Hamada, Toshihisa Ohtsuka, Shoji Tsuji, Yoshihisa Takiyama

Journal of human genetics 64 ( 11 ) 1055 - 1065 2019.11

Language：English Publishing type：Research paper (scientific journal)

We aimed to find a new causative gene and elucidate the molecular mechanisms underlying a new type of hereditary spastic paraplegia (HSP). Patients with HSP were recruited from the Japan Spastic Paraplegia Research Consortium (JASPAC). Exome sequencing of genomic DNA from patients in four families was carried out, followed by Sanger sequencing of the UBAP1 gene. A mouse homolog of one UBAP1 frameshift mutation carried by one of the patients was created as a disease model. Functional properties of the UBAP1 wild type and UBAP1-mutant in mouse hippocampus neurons were examined. We identified three novel heterozygous loss of function mutations (c.425_426delAG, c.312delC, and c.535G>T) in the UBAP1 gene as the genetic cause of a new type of HSP (SPG80). All the patients presented identical clinical features of a pure type of juvenile-onset HSP. Functional studies on mouse hippocampal neurons revealed that the C-terminal deletion UBAP1-mutant of our disease model had lost its ability to bind ubiquitin in vitro. Overexpression of the UBAP1 wild type interacts directly with ubiquitin on enlarged endosomes, while the UBAP1-mutant cannot be recruited to endosome membranes. Our study demonstrated that mutations in the UBAP1 gene cause a new type of HSP and elucidated its pathogenesis. The full-length UBAP1 protein is involved in endosomal dynamics in neurons, while loss of UBAP1 function may perturb endosomal fusion and sorting of ubiquitinated cargos. These effects could be more prominent in neurons, thereby giving rise to the phenotype of a neurodegenerative disease such as HSP.

DOI： 10.1038/s10038-019-0670-9

Prominent Spasticity and Hyperreflexia of the Legs in a Nepalese Patient with Friedreich Ataxia. Reviewed

Hiroya Naruse, Yuji Takahashi, Hiroyuki Ishiura, Takashi Matsukawa, Jun Mitsui, Yaeko Ichikawa, Masashi Hamada, Jun Shimizu, Jun Goto, Tatsushi Toda, Shoji Tsuji

Internal medicine (Tokyo, Japan) 58 ( 19 ) 2865 - 2869 2019.10

Language：English Publishing type：Research paper (scientific journal)

Friedreich ataxia (FRDA) is an autosomal recessive spinocerebellar ataxia caused by mutations of FXN. Hypotonus and hyporeflexia of the lower extremities are observed in most FRDA patients. Patients with hyperreflexia, called Friedreich ataxia with retained reflexes (FARR), have also been identified. We herein report the case of a 16-year-old Nepalese boy presenting with early-onset ataxia with prominent spasticity and hyperreflexia of the legs. Mutational analyses established the diagnosis of FRDA presenting as FARR. A haplotype analysis revealed that expanded alleles of the patient shared a common haplotype with Indian and European FRDA patients, suggesting that the mutation descended from a common founder.

DOI： 10.2169/internalmedicine.2953-19

Ataxic phenotype with altered CaV3.1 channel property in a mouse model for spinocerebellar ataxia 42. Reviewed International journal

Shunta Hashiguchi, Hiroshi Doi, Misako Kunii, Yukihiro Nakamura, Misa Shimuta, Etsuko Suzuki, Shigeru Koyano, Masaki Okubo, Hitaru Kishida, Masaaki Shiina, Kazuhiro Ogata, Fumiko Hirashima, Yukichi Inoue, Shun Kubota, Noriko Hayashi, Haruko Nakamura, Keita Takahashi, Atsuko Katsumoto, Mikiko Tada, Kenichi Tanaka, Toshikuni Sasaoka, Satoko Miyatake, Noriko Miyake, Hirotomo Saitsu, Nozomu Sato, Kokoro Ozaki, Kiyobumi Ohta, Takanori Yokota, Hidehiro Mizusawa, Jun Mitsui, Hiroyuki Ishiura, Jun Yoshimura, Shinichi Morishita, Shoji Tsuji, Hideyuki Takeuchi, Kinya Ishikawa, Naomichi Matsumoto, Taro Ishikawa, Fumiaki Tanaka

Neurobiology of disease 130 104516 - 104516 2019.10

Language：English Publishing type：Research paper (scientific journal)

Spinocerebellar ataxia 42 (SCA42) is a neurodegenerative disorder recently shown to be caused by c.5144G > A (p.Arg1715His) mutation in CACNA1G, which encodes the T-type voltage-gated calcium channel CaV3.1. Here, we describe a large Japanese family with SCA42. Postmortem pathological examination revealed severe cerebellar degeneration with prominent Purkinje cell loss without ubiquitin accumulation in an SCA42 patient. To determine whether this mutation causes ataxic symptoms and neurodegeneration, we generated knock-in mice harboring c.5168G > A (p.Arg1723His) mutation in Cacna1g, corresponding to the mutation identified in the SCA42 family. Both heterozygous and homozygous mutants developed an ataxic phenotype from the age of 11-20 weeks and showed Purkinje cell loss at 50 weeks old. Degenerative change of Purkinje cells and atrophic thinning of the molecular layer were conspicuous in homozygous knock-in mice. Electrophysiological analysis of Purkinje cells using acute cerebellar slices from young mice showed that the point mutation altered the voltage dependence of CaV3.1 channel activation and reduced the rebound action potentials after hyperpolarization, although it did not significantly affect the basic properties of synaptic transmission onto Purkinje cells. Finally, we revealed that the resonance of membrane potential of neurons in the inferior olivary nucleus was decreased in knock-in mice, which indicates that p.Arg1723His CaV3.1 mutation affects climbing fiber signaling to Purkinje cells. Altogether, our study shows not only that a point mutation in CACNA1G causes an ataxic phenotype and Purkinje cell degeneration in a mouse model, but also that the electrophysiological abnormalities at an early stage of SCA42 precede Purkinje cell loss.

DOI： 10.1016/j.nbd.2019.104516

Sporadic progressive myoclonic epilepsy with early‐onset dementia caused by a de novo mutation in PSEN1

Tomoya Taminato, Manabu Araki, Noriko Sato, Hiroyuki Ishiura, Jun Mitsui, Jun Yoshimura, Koichiro Doi, Shinichi Morishita, Shoji Tsuji, Yuji Takahashi

Neurology and Clinical Neuroscience 7 ( 5 ) 294 - 296 2019.9

Functional evaluation of PDGFB-variants in idiopathic basal ganglia calcification, using patient-derived iPS cells. Reviewed International journal

Shin-Ichiro Sekine, Masayuki Kaneko, Masaki Tanaka, Yuhei Ninomiya, Hisaka Kurita, Masatoshi Inden, Megumi Yamada, Yuichi Hayashi, Takashi Inuzuka, Jun Mitsui, Hiroyuki Ishiura, Atsushi Iwata, Hiroto Fujigasaki, Hisamitsu Tamaki, Ryusei Tamaki, Shinsuke Kito, Yoshiharu Taguchi, Kortaro Tanaka, Naoki Atsuta, Gen Sobue, Takayuki Kondo, Haruhisa Inoue, Shoji Tsuji, Isao Hozumi

Scientific reports 9 ( 1 ) 5698 - 5698 2019.4

Language：English Publishing type：Research paper (scientific journal)

Causative genes in patients with idiopathic basal ganglia calcification (IBGC) (also called primary familial brain calcification (PFBC)) have been reported in the past several years. In this study, we surveyed the clinical and neuroimaging data of 70 sporadic patients and 16 families (86 unrelated probands in total) in Japan, and studied variants of PDGFB gene in the patients. Variant analyses of PDGFB showed four novel pathogenic variants, namely, two splice site variants (c.160 + 2T > A and c.457-1G > T), one deletion variant (c.33_34delCT), and one insertion variant (c.342_343insG). Moreover, we developed iPS cells (iPSCs) from three patients with PDGFB variants (c.160 + 2T > A, c.457-1G > T, and c.33_34 delCT) and induced endothelial cells. Enzyme-linked immunoassay analysis showed that the levels of PDGF-BB, a homodimer of PDGF-B, in the blood sera of patients with PDGFB variants were significantly decreased to 34.0% of that of the control levels. Those in the culture media of the endothelial cells derived from iPSCs of patients also significantly decreased to 58.6% of the control levels. As the endothelial cells developed from iPSCs of the patients showed a phenotype of the disease, further studies using IBGC-specific iPSCs will give us more information on the pathophysiology and the therapy of IBGC in the future.

DOI： 10.1038/s41598-019-42115-y

The novel de novo mutation of KIF1A gene as the cause for Spastic paraplegia 30 in a Japanese case. Reviewed International journal

Yoshikawa K, Kuwahara M, Saigoh K, Ishiura H, Yamagishi Y, Hamano Y, Samukawa M, Suzuki H, Hirano M, Mitsui Y, Tsuji S, Kusunoki S

eNeurologicalSci 14 34 - 37 2019.3

Language：English Publishing type：Research paper (scientific journal)

Spastic paraplegia 30 is a recently established autosomal recessive disease characterized by a complex form of spastic paraplegia associated with neuropathy. Homozygous mutations of KIF1A reportedly lead to hereditary spastic paraplegia or hereditary sensory and autonomic neuropathy type 2 (HSAN2), whereas heterozygous mutations can cause nonsyndromic and syndromic intellectual disability (MRD9). Here we report the case of a 37-year-old female who presented with gait disturbance complicated with moyamoya disease. Results: The patient exhibited hypotonia during infancy, after which intellectual disability, epileptic fits, spastic paraplegia, and cerebellar atrophy occurred. Genetic analysis revealed a novel de novo mutation (c.254C > A, p.A85D) in the motor domain of KIF1A.

DOI： 10.1016/j.ensci.2018.11.026

A novel homozygous mutation of the TFG gene in a patient with early onset spastic paraplegia and later onset sensorimotor polyneuropathy. Reviewed International journal

Takuya Miyabayashi, Tatsuhiro Ochiai, Naoki Suzuki, Masashi Aoki, Takehiko Inui, Yukimune Okubo, Ryo Sato, Noriko Togashi, Hiroshi Takashima, Hiroyuki Ishiura, Shoji Tsuji, Kishin Koh, Yoshihisa Takiyama, Kazuhiro Haginoya

Journal of human genetics 64 ( 2 ) 171 - 176 2019.2

Language：English Publishing type：Research paper (scientific journal)

The tropomyosin-receptor kinase fused gene (TFG) has recently been implicated in several distinct hereditary disorders, including the autosomal-recessive form of complicated hereditary spastic paraplegia called SPG57. Previously, three homozygous variants of the TFG gene were reported in five families with SPG57, in which early onset spastic paraplegia, optic atrophy, and peripheral neuropathy were variably identified. Here, we present the first Japanese patient with SPG57, and have added a homozygous p.Ile66Thr variant as the fourth SPG57 genotype.

DOI： 10.1038/s10038-018-0538-4

PLA2G6-associated neurodegeneration presenting as a complicated form of hereditary spastic paraplegia. Reviewed International journal

Kishin Koh, Yuta Ichinose, Hiroyuki Ishiura, Haitian Nan, Jun Mitsui, Junya Takahashi, Wakiro Sato, Yoshiaki Itoh, Kyoko Hoshino, Shoji Tsuji, Yoshihisa Takiyama

Journal of human genetics 64 ( 1 ) 55 - 59 2019.1

Language：English Publishing type：Research paper (scientific journal)

PLA2G6-associated neurodegeneration (PLAN) comprises heterogeneous neurodegenerative disorders, including infantile neuroaxonal dystrophy, neurodegeneration with brain iron accumulation 2B, and Parkinson disease 14 (PARK14). In addition, very recently, PLA2G6 mutations have been reported to represent a phenotype of hereditary spastic paraplegia (HSP). In this study, we screened 383 HSP families to clarify the frequency of PLA2G6 mutations in the Japan Spastic Paraplegia Research Consortium, and revealed the clinical characteristics of HSP with PLA2G6 mutations. We found three families with compound heterozygous mutations of the PLA2G6 gene, c.517 C > T/c.1634A > G, c.662 T > C/c.991 G > T, and c.1187-2 A > G/c.1933C > T, and one family with a homozygous mutation of the PLA2G6 gene, c.1904G > A/c.1904G > A. All three families with compound heterozygous mutations presented a uniform phenotype of a complicated form of HSP with infantile/child-onset spastic paraplegia, cerebellar ataxia, and mental retardation. On the other hand, the family with a homozygous mutation presented a late-onset complicated form of HSP with parkinsonism. This study may extend the clinical and genetic findings for PLAN.

DOI： 10.1038/s10038-018-0519-7

Correction: PLA2G6-associated neurodegeneration presenting as a complicated form of hereditary spastic paraplegia. Reviewed International journal

Kishin Koh, Yuta Ichinose, Hiroyuki Ishiura, Haitian Nan, Jun Mitsui, Junya Takahashi, Wakiro Sato, Yoshiaki Itoh, Kyoko Hoshino, Shoji Tsuji, Yoshihisa Takiyama

Journal of human genetics 64 ( 1 ) 61 - 63 2019.1

Language：English Publishing type：Research paper (scientific journal)

The originally published version of this article contained an error in Fig. 1 and Table 2. The correct figure and table of this article should have read as below. This has now been corrected in the PDF and HTML versions of the article. The authors apologize for any inconvenience caused.

DOI： 10.1038/s10038-018-0533-9

Atypical Familial Amyotrophic Lateral Sclerosis with Slowly Progressing Lower Extremities-predominant Late-onset Muscular Weakness and Atrophy. Reviewed

Jumpei Togawa, Takekazu Ohi, Jun-Hui Yuan, Hiroshi Takashima, Hirokazu Furuya, Shinji Takechi, Junko Fujitake, Saki Hayashi, Hiroyuki Ishiura, Hiroya Naruse, Jun Mitsui, Shoji Tsuji

Internal medicine (Tokyo, Japan) 58 ( 13 ) 1851 - 1858 2019

Language：English Publishing type：Research paper (scientific journal)

Objective Amyotrophic lateral sclerosis (ALS) is an adult-onset neurodegenerative disease characterized by the progressive loss of the upper and lower motor neurons that progresses to paralysis of almost all skeletal muscles of the extremities, bulbar, and respiratory system. Although most ALS cases are sporadic, about 10% are dominantly inherited. We herein report an atypical phenotype of familial ALS (fALS). To elucidate the phenotype-genotype correlation of this atypical phenotype of fALS, clinical and genetic investigations were performed. Methods and Patients Five sibling patients (three men, two women) from a Japanese family and one healthy sibling (a woman) were clinically interviewed and examined. Genetic analyses, including genome-wide linkage analyses and whole-exome sequencing, were performed using genomic DNA extracted from the peripheral blood samples of these siblings. Results The clinical features of fALS are characterized by slow progression (mean duration of the disease±standard deviation [SD]: 19.6±3.9 years) and lower extremities-predominant late-onset muscular weakness (mean onset of muscular weakness±SD: 52.8±2.6 years). Genetic analyses revealed novel heterozygous missense mutations of c.2668C>T, p.R890C in the PLEC gene and c.421G>C, p.V141L in the ST3GAL6 gene in all affected siblings. Conclusion A new atypical fALS family with a benign clinical course is herein reported. We identified two candidate gene mutations of PLEC and ST3GAL6 linked to this phenotype.

DOI： 10.2169/internalmedicine.2222-18

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