De novo p.Arg756Cys mutation of ATP1A3 causes an atypical form of alternating hemiplegia of childhood with prolonged paralysis and choreoathetosis

Hikaru Kanemasa, Ryoko Fukai, Yasunari Sakai, Michiko Torio, Noriko Miyake, Sooyoung Lee, Hiroaki Ono, Satoshi Akamine, Kei Nishiyama, Masafumi Sanefuji, Yoshito Ishizaki, Hiroyuki Torisu, Hirotomo Saitsu, Naomichi Matsumoto, Toshiro Hara

Research output: Contribution to journalArticle

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Abstract

Background: Alternating hemiplegia of childhood (AHC) is a rare neurological disorder that manifests recurrent attacks of hemiplegia, oculogyric, and choreoathetotic involuntary movements. De novo mutations in ATP1A3 cause three types of neurological diseases: AHC; rapid-onset dystonia-Parkinsonism (RDP); and cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndromes. It remains to be determined whether or not a rare mutation in ATP1A3 may cause atypical phenotypes. Case presentation: A 7-year-old boy presented with recurrent symptoms of generalized paralysis since 1 year and 5 months of age. Hypotonia, dystonia, and choreoathetosis persisted with exacerbation under febrile conditions, but no cerebellar ataxia had ever evolved in 6 years. Whole-exome sequencing (WES) was performed to determine his genetic background, and mutations were validated by the Sanger method. Crude protein extracts were prepared from the cultured cells, and expression of the wild-type or mutant ATP1A3 proteins were analyzed by Western blotting. WES identified a de novo pathogenic mutation in ATP1A3 (c.2266C>T:p.R756C) for this patient. A literature overview of two reported cases with p.R756C and p.R756H mutations showed both overlapping and distinct phenotypes when compared with those of the present case. The expression of the mutant form (R756C) of ATP1A3 did not differ markedly from that of the wild-type and D801N proteins. Conclusions: This study confirmed that p.R756C mutation of ATP1A3 cause atypical forms of AHC-associated disorders. The wide spectra of neurological phenotypes in AHC are linked to as-yet-unknown deficits in the functions of mutant ATP1A3.

Original languageEnglish
Article number174
JournalBMC neurology
Volume16
Issue number1
DOIs
Publication statusPublished - Sep 15 2016

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Paralysis
Mutation
Exome
Phenotype
Dystonic Disorders
Cerebellar Ataxia
Muscle Hypotonia
Hemiplegia
Dystonia
Dyskinesias
Mutant Proteins
Nervous System Diseases
Complex Mixtures
Alternating hemiplegia of childhood
Cultured Cells
Proteins
Fever
Western Blotting
CAPOS syndrome

All Science Journal Classification (ASJC) codes

  • Clinical Neurology

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De novo p.Arg756Cys mutation of ATP1A3 causes an atypical form of alternating hemiplegia of childhood with prolonged paralysis and choreoathetosis. / Kanemasa, Hikaru; Fukai, Ryoko; Sakai, Yasunari; Torio, Michiko; Miyake, Noriko; Lee, Sooyoung; Ono, Hiroaki; Akamine, Satoshi; Nishiyama, Kei; Sanefuji, Masafumi; Ishizaki, Yoshito; Torisu, Hiroyuki; Saitsu, Hirotomo; Matsumoto, Naomichi; Hara, Toshiro.

In: BMC neurology, Vol. 16, No. 1, 174, 15.09.2016.

Research output: Contribution to journalArticle

Kanemasa, H, Fukai, R, Sakai, Y, Torio, M, Miyake, N, Lee, S, Ono, H, Akamine, S, Nishiyama, K, Sanefuji, M, Ishizaki, Y, Torisu, H, Saitsu, H, Matsumoto, N & Hara, T 2016, 'De novo p.Arg756Cys mutation of ATP1A3 causes an atypical form of alternating hemiplegia of childhood with prolonged paralysis and choreoathetosis', BMC neurology, vol. 16, no. 1, 174. https://doi.org/10.1186/s12883-016-0680-6
Kanemasa, Hikaru ; Fukai, Ryoko ; Sakai, Yasunari ; Torio, Michiko ; Miyake, Noriko ; Lee, Sooyoung ; Ono, Hiroaki ; Akamine, Satoshi ; Nishiyama, Kei ; Sanefuji, Masafumi ; Ishizaki, Yoshito ; Torisu, Hiroyuki ; Saitsu, Hirotomo ; Matsumoto, Naomichi ; Hara, Toshiro. / De novo p.Arg756Cys mutation of ATP1A3 causes an atypical form of alternating hemiplegia of childhood with prolonged paralysis and choreoathetosis. In: BMC neurology. 2016 ; Vol. 16, No. 1.
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abstract = "Background: Alternating hemiplegia of childhood (AHC) is a rare neurological disorder that manifests recurrent attacks of hemiplegia, oculogyric, and choreoathetotic involuntary movements. De novo mutations in ATP1A3 cause three types of neurological diseases: AHC; rapid-onset dystonia-Parkinsonism (RDP); and cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndromes. It remains to be determined whether or not a rare mutation in ATP1A3 may cause atypical phenotypes. Case presentation: A 7-year-old boy presented with recurrent symptoms of generalized paralysis since 1 year and 5 months of age. Hypotonia, dystonia, and choreoathetosis persisted with exacerbation under febrile conditions, but no cerebellar ataxia had ever evolved in 6 years. Whole-exome sequencing (WES) was performed to determine his genetic background, and mutations were validated by the Sanger method. Crude protein extracts were prepared from the cultured cells, and expression of the wild-type or mutant ATP1A3 proteins were analyzed by Western blotting. WES identified a de novo pathogenic mutation in ATP1A3 (c.2266C>T:p.R756C) for this patient. A literature overview of two reported cases with p.R756C and p.R756H mutations showed both overlapping and distinct phenotypes when compared with those of the present case. The expression of the mutant form (R756C) of ATP1A3 did not differ markedly from that of the wild-type and D801N proteins. Conclusions: This study confirmed that p.R756C mutation of ATP1A3 cause atypical forms of AHC-associated disorders. The wide spectra of neurological phenotypes in AHC are linked to as-yet-unknown deficits in the functions of mutant ATP1A3.",
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T1 - De novo p.Arg756Cys mutation of ATP1A3 causes an atypical form of alternating hemiplegia of childhood with prolonged paralysis and choreoathetosis

AU - Kanemasa, Hikaru

AU - Fukai, Ryoko

AU - Sakai, Yasunari

AU - Torio, Michiko

AU - Miyake, Noriko

AU - Lee, Sooyoung

AU - Ono, Hiroaki

AU - Akamine, Satoshi

AU - Nishiyama, Kei

AU - Sanefuji, Masafumi

AU - Ishizaki, Yoshito

AU - Torisu, Hiroyuki

AU - Saitsu, Hirotomo

AU - Matsumoto, Naomichi

AU - Hara, Toshiro

PY - 2016/9/15

Y1 - 2016/9/15

N2 - Background: Alternating hemiplegia of childhood (AHC) is a rare neurological disorder that manifests recurrent attacks of hemiplegia, oculogyric, and choreoathetotic involuntary movements. De novo mutations in ATP1A3 cause three types of neurological diseases: AHC; rapid-onset dystonia-Parkinsonism (RDP); and cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndromes. It remains to be determined whether or not a rare mutation in ATP1A3 may cause atypical phenotypes. Case presentation: A 7-year-old boy presented with recurrent symptoms of generalized paralysis since 1 year and 5 months of age. Hypotonia, dystonia, and choreoathetosis persisted with exacerbation under febrile conditions, but no cerebellar ataxia had ever evolved in 6 years. Whole-exome sequencing (WES) was performed to determine his genetic background, and mutations were validated by the Sanger method. Crude protein extracts were prepared from the cultured cells, and expression of the wild-type or mutant ATP1A3 proteins were analyzed by Western blotting. WES identified a de novo pathogenic mutation in ATP1A3 (c.2266C>T:p.R756C) for this patient. A literature overview of two reported cases with p.R756C and p.R756H mutations showed both overlapping and distinct phenotypes when compared with those of the present case. The expression of the mutant form (R756C) of ATP1A3 did not differ markedly from that of the wild-type and D801N proteins. Conclusions: This study confirmed that p.R756C mutation of ATP1A3 cause atypical forms of AHC-associated disorders. The wide spectra of neurological phenotypes in AHC are linked to as-yet-unknown deficits in the functions of mutant ATP1A3.

AB - Background: Alternating hemiplegia of childhood (AHC) is a rare neurological disorder that manifests recurrent attacks of hemiplegia, oculogyric, and choreoathetotic involuntary movements. De novo mutations in ATP1A3 cause three types of neurological diseases: AHC; rapid-onset dystonia-Parkinsonism (RDP); and cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss (CAPOS) syndromes. It remains to be determined whether or not a rare mutation in ATP1A3 may cause atypical phenotypes. Case presentation: A 7-year-old boy presented with recurrent symptoms of generalized paralysis since 1 year and 5 months of age. Hypotonia, dystonia, and choreoathetosis persisted with exacerbation under febrile conditions, but no cerebellar ataxia had ever evolved in 6 years. Whole-exome sequencing (WES) was performed to determine his genetic background, and mutations were validated by the Sanger method. Crude protein extracts were prepared from the cultured cells, and expression of the wild-type or mutant ATP1A3 proteins were analyzed by Western blotting. WES identified a de novo pathogenic mutation in ATP1A3 (c.2266C>T:p.R756C) for this patient. A literature overview of two reported cases with p.R756C and p.R756H mutations showed both overlapping and distinct phenotypes when compared with those of the present case. The expression of the mutant form (R756C) of ATP1A3 did not differ markedly from that of the wild-type and D801N proteins. Conclusions: This study confirmed that p.R756C mutation of ATP1A3 cause atypical forms of AHC-associated disorders. The wide spectra of neurological phenotypes in AHC are linked to as-yet-unknown deficits in the functions of mutant ATP1A3.

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