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Uneoka S, Kobayashi T, Numata-Uematsu Y, Oikawa Y, Katata Y, Okubo Y, Abe Y, Kikuchi A, Takayama J, Tamiya G, Kure S, Saito K, Uematsu M. A Case Series of Patients With MYBPC1 Gene Variants Featuring Undulating Tongue Movements as Myogenic Tremor. Pediatr Neurol 2023; 146:16-20. [PMID: 37392669 DOI: 10.1016/j.pediatrneurol.2023.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 04/18/2023] [Accepted: 06/06/2023] [Indexed: 07/03/2023]
Abstract
Myosin-binding protein C1 (MYBPC1) encodes myosin-binding protein C, slow type (sMyBP-C), an accessory protein that regulates actomyosin cross-linking, stabilizes thick filaments, and modulates contractility in muscle sarcomeres and has recently been linked to myopathy with tremor. The clinical features of MYBPC1 mutations manifesting in early childhood bear some similarities to those of spinal muscular atrophy (SMA), such as hypotonia, involuntary movement of the tongue and limbs, and delayed motor development. The development of novel therapies for SMA has necessitated the importance of differentiating SMA from other diseases in the early infancy period. We report the characteristic tongue movements of MYBPC1 mutations, along with other clinical findings, such as positive deep tendon reflexes and normal peripheral nerve conduction velocity testing, which could help in considering other diseases as differential diagnoses.
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Affiliation(s)
- Saki Uneoka
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Tomoko Kobayashi
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan; Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | | | - Yoshitsugu Oikawa
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Yu Katata
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Yukimune Okubo
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Yu Abe
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Atsuo Kikuchi
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan; Department of Rare Disease Genomics, Tohoku University School of Medicine, Sendai, Japan
| | - Jun Takayama
- Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan; Department of Rare Disease Genomics, Tohoku University School of Medicine, Sendai, Japan; Department of AI and Innovative Medicine, Tohoku University School of Medicine, Sendai, Japan; Statistical Genetics Team, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan
| | - Gen Tamiya
- Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan; Department of Rare Disease Genomics, Tohoku University School of Medicine, Sendai, Japan; Department of AI and Innovative Medicine, Tohoku University School of Medicine, Sendai, Japan; Statistical Genetics Team, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan
| | - Shigeo Kure
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Kayoko Saito
- Institute of Medical Genetics, Tokyo Women's Medical University, Tokyo, Japan
| | - Mitsugu Uematsu
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
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Katata Y, Uneoka S, Saijyo N, Aihara Y, Miyazoe T, Koyamaishi S, Oikawa Y, Ito Y, Abe Y, Numata-Uematsu Y, Takayama J, Kikuchi A, Tamiya G, Uematsu M, Kure S. The longest reported sibling survivors of a severe form of congenital myasthenic syndrome with the ALG14 pathogenic variant. Am J Med Genet A 2021; 188:1293-1298. [PMID: 34971077 DOI: 10.1002/ajmg.a.62629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/26/2021] [Accepted: 12/07/2021] [Indexed: 11/06/2022]
Abstract
Congenital myasthenic syndromes (CMS) is a group of diseases that causes abnormalities at the neuromuscular junction owing to genetic anomalies. The pathogenic variant in ALG14 results in a severe pathological form of CMS causing end-plate acetylcholine receptor deficiency. Here, we report the cases of two siblings with CMS associated with a novel variant in ALG14. Immediately after birth, they showed hypotonia and multiple joint contractures with low Apgar scores. Ptosis, low-set ears, and high-arched palate were noted. Deep tendon reflexes were symmetrical. They showed worsening swallowing and respiratory problems; hence, nasal feeding and tracheotomy were performed. Cranial magnetic resonance imaging scans revealed delayed myelination and cerebral atrophy. Exome sequencing indicated that the siblings had novel compound heterozygous missense variants, c.590T>G (p.Val197Gly) and c.433G>A (p.Gly145Arg), in exon 4 of ALG14. Repetitive nerve stimulation test showed an abnormal decrease in compound muscle action potential. After treatment with pyridostigmine, the time off the respirator increased. Their epileptic seizures were well controlled by anti-epileptic drugs. Their clinical course is stable even now at the ages of 5 and 2 years, making them the longest reported survivors of a severe form of CMS with the ALG14 variant thus far.
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Affiliation(s)
- Yu Katata
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Saki Uneoka
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Naoya Saijyo
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Yu Aihara
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Takamitsu Miyazoe
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Shun Koyamaishi
- Department of Pediatrics, Hachinohe City Hospital, Hachinohe, Japan
| | - Yoshitsugu Oikawa
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Yuya Ito
- Department of Pediatrics, Hachinohe City Hospital, Hachinohe, Japan.,Department of Neonatology, Aomori Prefectural Central Hospital, Hachinohe, Japan
| | - Yu Abe
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan.,Department of Pediatrics, Tsuruoka Municipal Shonai Hospital, Tsuruoka, Japan
| | | | - Jun Takayama
- Department of AI and Innovative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.,Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan.,Statistical Genetics Team, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan
| | - Atsuo Kikuchi
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Gen Tamiya
- Department of AI and Innovative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.,Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan.,Statistical Genetics Team, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan
| | - Mitsugu Uematsu
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
| | - Shigeo Kure
- Department of Pediatrics, Tohoku University School of Medicine, Sendai, Japan
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Shibuya M, Uneoka S, Onuma A, Kodama K, Endo W, Okubo Y, Inui T, Togashi N, Nakashima I, Hino-Fukuyo N, Ida H, Miyatake S, Matsumoto N, Haginoya K. A 23-year follow-up report of juvenile-onset Sandhoff disease presenting with a motor neuron disease phenotype and a novel variant. Brain Dev 2021; 43:1029-1032. [PMID: 34217565 DOI: 10.1016/j.braindev.2021.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/17/2021] [Accepted: 06/22/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND The clinical severity of Sandhoff disease is known to vary widely. Furthermore, long-term follow-up report is very limited in the literature. CASE PRESENTATION We present a long-term follow-up report of a patient with juvenile-onset Sandhoff disease with a motor neuron disease phenotype. The patient had compound heterozygous variants of HEXB (p.Trp460Arg, p. Arg533His); the Trp460Arg was a novel variant. Long-term follow-up revealed no intellectual deterioration, swallowing dysfunction, or respiratory muscle dysfunction despite progressive weakness of the extremities and sensory disturbances. CONCLUSION We need to be aware of Sandhoff disease in patients with juvenile-onset motor neuron disease.
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Affiliation(s)
- Moriei Shibuya
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Saki Uneoka
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Akira Onuma
- Department of Pediatric Neurology, Takuto Rehabilitation Center for Children, Sendai, Japan
| | - Kaori Kodama
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Wakaba Endo
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Yukimune Okubo
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Takehiko Inui
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Noriko Togashi
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Ichiro Nakashima
- Department of Neurology, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Naomi Hino-Fukuyo
- Department of Pediatrics, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Hiroyuki Ida
- Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
| | - Satoko Miyatake
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama 236-0004, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama 236-0004, Japan
| | - Kazuhiro Haginoya
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan; Department of Pediatric Neurology, Takuto Rehabilitation Center for Children, Sendai, Japan.
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Togashi N, Fujita A, Shibuya M, Uneoka S, Miyabayashi T, Sato R, Okubo Y, Endo W, Inui T, Jin K, Matsumoto N, Haginoya K. Fifteen-year follow-up of a patient with a DHDDS variant with non-progressive early onset myoclonic tremor and rare generalized epilepsy. Brain Dev 2020; 42:696-699. [PMID: 32654954 DOI: 10.1016/j.braindev.2020.06.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/16/2020] [Accepted: 06/21/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Generalized epilepsy and tremor phenotypes have been reported in some genetic disorders. Among them benign adult familial myoclonus epilepsy (BAFME) has been confirmed as a clearly defined clinical and genetic entity. On the other hand, non-progressive tremor and generalized epilepsy phenotypes have also been reported in patients with DHDDS variants. CASE PRESENTATION We report on a long term follow-up of patient with de novo missense variant of DHDDS, who revealed non progressive nature. This 18-year-old woman presented non-progressive tremor since her early infancy. She had rare seizures. Her tremor was considered as cortical myoclonic tremor with giant somatosensory evoked potentials. CONCLUSION In patients with early onset, non-progressive tremor and rare generalized epilepsy phenotypes, DHDDS variants may be considered in the genetic differential diagnosis.
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Affiliation(s)
- Noriko Togashi
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Atsushi Fujita
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Moriei Shibuya
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Saki Uneoka
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Takuya Miyabayashi
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Ryo Sato
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Yukimune Okubo
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Wakaba Endo
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Takehiko Inui
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan
| | - Kazutaka Jin
- Department of Epileptology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Kazuhiro Haginoya
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai 989-3126, Japan.
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