Chiharu Isono

Mutations in the gene encoding p62 in Japanese patients with amyotrophic lateral sclerosis

Objective: The purpose of this study was to find mutations in the SQSTM1 gene encoding p62 in Japanese patients with amyotrophic lateral sclerosis (ALS), since this gene has been recently identified as a causative gene for familial and sporadic ALS in the United States. Methods: We sequenced this gene in 61 Japanese patients with sporadic and familial ALS. To our knowledge, we describe for the first time the clinical information of such mutation-positive patients. Results: We found novel mutations, p.Ala53Thr and p.Pro439Leu, in 2 patients with sporadic ALS. The clinical picture of the mutation-positive patients was that of typical ALS with varied upper motor neuron signs. Although this gene is causative for another disease, Paget disease of bone (PDB), none of our patients showed evidence of concomitant PDB. Conclusion: The presence of mutations in this racial population suggests worldwide, common involvement of the SQSTM1 gene in ALS.

VCP gene analyses in Japanese patients with sporadic amyotrophic lateral sclerosis identify a new mutation

Accumulating evidence has proven that mutations in the VCP gene encoding valosin-containing protein (VCP) cause inclusion body myopathy with Paget disease of the bone and frontotemporal dementia. This gene was later found to be causative for amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disease, occurring typically in elderly persons. We thus sequenced the VCP gene in 75 Japanese patients with sporadic ALS negative for mutations in other genes causative for ALS and found a novel mutation, p.Arg487His, in 1 patient. The newly identified mutant as well as known mutants rendered neuronal cells susceptible to oxidative stress. The presence of the mutation in the Japanese population extends the geographic region for involvement of the VCP gene in sporadic ALS to East Asia.

Rotigotine Transdermal Patch Improves Swallowing in Dysphagic Patients with Parkinson's Disease.

Abnormal swallowing, dysphagia, is a potentially fatal symptom in Parkinson’s disease (PD) and is characterized by frequent silent aspiration, an unrecognized risk of suffocation and aspiration pneumonia. Several studies have reported that the injection of apomorphine, a dopamine agonist, alleviated dysphagia in some patients with PD. The effects of other antiparkinson medications against dysphagia remain controversial. Rotigotine is another dopamine agonist with non-oral administration, i.e., a transdermal patch. Its noninvasiveness seems to render this medicine even more suitable than apomorphine for dysphasic patients. However, no direct evidence has been reported. In the present retrospective open-label study, we for the first time objectively showed that rotigotine improved swallowing on videofluoroscopic examination in dysphagic patients with PD.

Differences in Dysphagia Between Spinocerebellar Ataxia Type 3 and Type 6

Spinocerebellar ataxias (SCAs) are a group of neurodegenerative disorders frequently associated with autosomal dominant inheritance. SCA type 3 (SCA3) and SCA type 6 (SCA6) are the most common forms in Japan as well as the rest of the world. SCA3 affects multiple nervous systems while SCA6 affects mainly the cerebellar system. Dysphagia is clinically important since aspiration pneumonia is the most common cause of death in patients with SCA. We retrospectively studied dysphagia in 7 patients with SCA3 and 13 with SCA6 by videofluoroscopic examination of swallowing (VF). This is a larger series of patients with SCA6 than in previous studies, which had inconsistent results. Dysphagia was evaluated according to the scale established by the Japanese Society of Dysphagia Rehabilitation and the dysphagia outcome severity scale, an internationally used scale. The former separately evaluates oral and pharyngeal phases, while the latter concurrently grades both phases. Dysphagia according to the Japanese scale was mild but statistically significant in SCA6 and severe in SCA3. DOSS indicated abnormalities in SCA3 but not in SCA6. The swallowing abnormalities in SCA3 or SCA6 did not parallel the duration of disease or physical disability, suggesting that even patients with early disease or with well-preserved physical functions were at risk for aspiration. Our patients with dysphagia received percutaneous endoscopic gastrostomy-tube feeding at an appropriate time and underwent rehabilitation of swallowing. No patient had aspiration pneumonia. In conclusion, evaluation of swallowing ability by VF is essential for preventing aspiration in patients with SCA.

Details of Treatment-Related Difficulties in Men with Anti-N-Methyl-d-Aspartate Receptor Encephalitis

Anti-N-methyl-d-aspartate receptor (anti-NMDAR) antibody-associated encephalitis is an immunologic disease characterized by a female preponderance. Males are infrequently affected. The clinical symptoms of affected boys as well as girls have been summarized, and they have some clinical features distinct from those of adults. However, the characteristics of men have been described in only a few reports. We describe in detail four men with anti-NMDAR encephalitis who presented with several clinical features that complicated disease management and recovery, including venous thrombosis, bilateral hippocampal involvement, hypersexuality, and joint contracture. We also report the first detailed clinical information about a male patient who died of this disease. In addition, we summarize the clinical characteristics of five patients previously reported by others.

Multiple system involvement in a Japanese patient with a V31A mutation in the SOD1 gene.

Abstract The superoxide dismutase-1 (SOD1) gene is the first gene for familial amyotrophic lateral sclerosis (ALS) with autosomal dominant inheritance. We describe a Japanese patient who had slowly progressive motor neuron disease with autonomic and sensory disturbances, urine incontinence and sensory neuropathy. This patient was found to have V31A mutation in the SOD1 gene. Although slow progression has been previously observed in patients with ALS caused by several mutations in the SOD1 gene, symptoms unrelated with motor systems are very rare. In addition, MRI showed cerebellar and brainstem atrophy, a finding previously unreported in SOD1-related ALS. The COQ2 gene, a gene very recently reported to be associated with multiple system atrophy, as well as genes for spinocerebellar ataxias was analyzed, the result of which showed no mutation in this patient. The V31A mutation is thus likely to be associated with atypical ALS affecting multiple systems.

Differential Progression of Dysphagia in Heredity and Sporadic Ataxias Involving Multiple Systems

Sporadic ataxia affecting multiple systems, such as cerebellar, extrapyramidal, and autonomic systems, is known as multiple system atrophy cerebellar type (MSA-C), while similar multisystem involvements are seen in certain types of hereditary ataxia, such as spinocerebellar ataxia type 3 (SCA3). Dysphagia is a common symptom that can predispose to aspiration pneumonia, a major cause of death in patients with these diseases. Although the progressions of dysphagia in patients with MSA-C have been reported sporadically, those in SCA3 have not been reported. We retrospectively compared the results of repetitive videofluoroscopic examinations in patients with SCA3 (n = 6) and in those with MSA-C (n = 7). The result showed that the gross progression of dysphagia was significantly slower in patients with SCA3 than in those with MSA-C, but the maximum progression speeds were not significantly different. The dysphagia severities were not associated with impaired activity of daily living evaluated by the Barthel index in MSA-C, but were associated in SCA3. Despite the small number of patients enrolled, these data suggest that physicians should monitor swallowing functions in patients with SCA3 after mild dysphagia develops because it may progress as rapidly as it does in MSA-C.

Abnormal Cystatin C Levels in Two Patients with Bardet-Biedl Syndrome

Bardet-Biedl syndrome (BBS) is an autosomal recessive disorder characterized by central obesity, mental impairment, rod-cone dystrophy, polydactyly, hypogonadism in males, and renal abnormalities. The causative genes have been identified as BBS1-14. In the Western countries, the prevalence of this disease ranges from 1/13,500 to 1/160,000, while only a few Japanese patients have been reported in the English-language literature. The incidence of renal dysfunction or anomalies in previous reports varies considerably ranging from ∼20% to universal occurrence. We here report that two Japanese patients who had BBS with normal BUN and creatinine levels had elevated levels of cystatin C, a sensitive marker of glomerular filtration rate. A urine albumin level increased only in the elder patient. Thus, cystatin C may be useful for detecting renal abnormalities in patients with an apparent normal renal function. Because this disease is diagnosed by accumulation of symptoms, such a sensitive marker might help early diagnosis of BBS.

Noncoding repeat expansions for ALS in Japan are associated with the ATXN8OS gene

Objective To assess the contribution of noncoding repeat expansions in Japanese patients with amyotrophic lateral sclerosis (ALS). Methods Sporadic ALS in Western countries is frequently associated with noncoding repeat expansions in the C9ORF72 gene. Spinocerebellar ataxia type 8 (SCA8) is another noncoding repeat disease caused by expanded CTA/CTG repeats in the ATXN8OS gene. Although the involvement of upper and lower motor neurons in SCA8 has been reported, a positive association between SCA8 and ALS remains unestablished. Spinocerebellar ataxia type 36 is a recently identified disease caused by noncoding repeat expansions in the NOP56 gene and is characterized by motor neuron involvement. We collected blood samples from 102 Japanese patients with sporadic ALS and analyzed the ATXN8OS gene by the PCR–Sanger sequencing method and the C9ORF72 and NOP56 genes by repeat-primed PCR assay. Results Three patients with ALS (3%) had mutations in the ATXN8OS gene, whereas no patient had a mutation in the C9ORF72 or NOP56 gene. The mutation-positive patients were clinically characterized by neck weakness or bulbar-predominant symptoms. None of our patients had apparent cerebellar atrophy on MRI, but 2 had nonsymptomatic abnormalities in the white matter or putamen. Conclusions Our finding reveals the importance of noncoding repeat expansions in Japanese patients with ALS and extends the clinical phenotype of SCA8. Three percent seems small but is still relatively large for Japan, considering that the most commonly mutated genes, including the SOD1 and SQSTM1 genes, only account for 2%–3% of sporadic patients each.

Contents Vol. 74, 2015

Basel • Freiburg • Paris • London • New York • Chennai • New Delhi • Bangkok • Beijing • Shanghai • Tokyo • Kuala Lumpur • Singapore • Sydney Founded 1897 as ‘Monatsschrift für Psychiatrie und Neurologie’, continued 1957–1967 as ‘Psychiatria et Neurologia’ Founders: C. Wernicke and Th. Ziehen. Successors: K. Bonhoeffer (1912–1938), J. Klaesi (1939–1967), E. Grünthal (1953–1967), H.E. Kaeser (1968–1993)