De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy

Hazrat Belal, Mitsuko Nakashima, Hiroshi Matsumoto, Kenji Yokochi, Mariko Ikeda, Kazushi Aoto, Mohammed Badrul Amin, Azusa Maruyama, Hiroaki Nagase, Takeshi Mizuguchi, Satoko Miyatake, Noriko Miyake, Kazumoto Iijima, Shigeaki Nonoyama, Naomichi Matsumoto, Hirotomo Saitsu

研究成果: Article

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By whole exome sequencing, we identified three de novo RHOBTB2 variants in three patients with epileptic encephalopathies (EEs). Interestingly, all three patients showed acute encephalopathy (febrile status epilepticus), with magnetic resonance imaging revealing hemisphere swelling or reduced diffusion in various brain regions. RHOBTB2 encodes Rho-related BTB domain-containing protein 2, an atypical Rho GTPase that is a substrate-specific adaptor or itself is a substrate for the Cullin-3 (CUL3)-based ubiquitin ligase complex. Transient expression experiments in Neuro-2a cells revealed that mutant RHOBTB2 was more abundant than wild-type RHOBTB2. Coexpression of CUL3 with RHOBTB2 decreased the level of wild-type RHOBTB2 but not the level of any of the three mutants, indicating impaired CUL3 complex-dependent degradation of the three mutants. These data indicate that RHOBTB2 variants are a rare genetic cause of EEs, in which acute encephalopathy might be a characteristic feature, and that precise regulation of RHOBTB2 levels is essential for normal brain function.

元の言語English
ページ(範囲)1070-1075
ページ数6
ジャーナルHuman Mutation
39
発行部数8
DOI
出版物ステータスPublished - 01-08-2018

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Cullin Proteins
rho GTP-Binding Proteins
Brain Diseases
Genes
Exome
Status Epilepticus
Brain
Ligases
Ubiquitin
Magnetic Resonance Imaging
Proteins

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

これを引用

Belal, H., Nakashima, M., Matsumoto, H., Yokochi, K., Ikeda, M., Aoto, K., ... Saitsu, H. (2018). De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy. Human Mutation, 39(8), 1070-1075. https://doi.org/10.1002/humu.23550
Belal, Hazrat ; Nakashima, Mitsuko ; Matsumoto, Hiroshi ; Yokochi, Kenji ; Ikeda, Mariko ; Aoto, Kazushi ; Amin, Mohammed Badrul ; Maruyama, Azusa ; Nagase, Hiroaki ; Mizuguchi, Takeshi ; Miyatake, Satoko ; Miyake, Noriko ; Iijima, Kazumoto ; Nonoyama, Shigeaki ; Matsumoto, Naomichi ; Saitsu, Hirotomo. / De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy. :: Human Mutation. 2018 ; 巻 39, 番号 8. pp. 1070-1075.
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abstract = "By whole exome sequencing, we identified three de novo RHOBTB2 variants in three patients with epileptic encephalopathies (EEs). Interestingly, all three patients showed acute encephalopathy (febrile status epilepticus), with magnetic resonance imaging revealing hemisphere swelling or reduced diffusion in various brain regions. RHOBTB2 encodes Rho-related BTB domain-containing protein 2, an atypical Rho GTPase that is a substrate-specific adaptor or itself is a substrate for the Cullin-3 (CUL3)-based ubiquitin ligase complex. Transient expression experiments in Neuro-2a cells revealed that mutant RHOBTB2 was more abundant than wild-type RHOBTB2. Coexpression of CUL3 with RHOBTB2 decreased the level of wild-type RHOBTB2 but not the level of any of the three mutants, indicating impaired CUL3 complex-dependent degradation of the three mutants. These data indicate that RHOBTB2 variants are a rare genetic cause of EEs, in which acute encephalopathy might be a characteristic feature, and that precise regulation of RHOBTB2 levels is essential for normal brain function.",
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Belal, H, Nakashima, M, Matsumoto, H, Yokochi, K, Ikeda, M, Aoto, K, Amin, MB, Maruyama, A, Nagase, H, Mizuguchi, T, Miyatake, S, Miyake, N, Iijima, K, Nonoyama, S, Matsumoto, N & Saitsu, H 2018, 'De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy', Human Mutation, 巻. 39, 番号 8, pp. 1070-1075. https://doi.org/10.1002/humu.23550

De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy. / Belal, Hazrat; Nakashima, Mitsuko; Matsumoto, Hiroshi; Yokochi, Kenji; Ikeda, Mariko; Aoto, Kazushi; Amin, Mohammed Badrul; Maruyama, Azusa; Nagase, Hiroaki; Mizuguchi, Takeshi; Miyatake, Satoko; Miyake, Noriko; Iijima, Kazumoto; Nonoyama, Shigeaki; Matsumoto, Naomichi; Saitsu, Hirotomo.

:: Human Mutation, 巻 39, 番号 8, 01.08.2018, p. 1070-1075.

研究成果: Article

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T1 - De novo variants in RHOBTB2, an atypical Rho GTPase gene, cause epileptic encephalopathy

AU - Belal, Hazrat

AU - Nakashima, Mitsuko

AU - Matsumoto, Hiroshi

AU - Yokochi, Kenji

AU - Ikeda, Mariko

AU - Aoto, Kazushi

AU - Amin, Mohammed Badrul

AU - Maruyama, Azusa

AU - Nagase, Hiroaki

AU - Mizuguchi, Takeshi

AU - Miyatake, Satoko

AU - Miyake, Noriko

AU - Iijima, Kazumoto

AU - Nonoyama, Shigeaki

AU - Matsumoto, Naomichi

AU - Saitsu, Hirotomo

PY - 2018/8/1

Y1 - 2018/8/1

N2 - By whole exome sequencing, we identified three de novo RHOBTB2 variants in three patients with epileptic encephalopathies (EEs). Interestingly, all three patients showed acute encephalopathy (febrile status epilepticus), with magnetic resonance imaging revealing hemisphere swelling or reduced diffusion in various brain regions. RHOBTB2 encodes Rho-related BTB domain-containing protein 2, an atypical Rho GTPase that is a substrate-specific adaptor or itself is a substrate for the Cullin-3 (CUL3)-based ubiquitin ligase complex. Transient expression experiments in Neuro-2a cells revealed that mutant RHOBTB2 was more abundant than wild-type RHOBTB2. Coexpression of CUL3 with RHOBTB2 decreased the level of wild-type RHOBTB2 but not the level of any of the three mutants, indicating impaired CUL3 complex-dependent degradation of the three mutants. These data indicate that RHOBTB2 variants are a rare genetic cause of EEs, in which acute encephalopathy might be a characteristic feature, and that precise regulation of RHOBTB2 levels is essential for normal brain function.

AB - By whole exome sequencing, we identified three de novo RHOBTB2 variants in three patients with epileptic encephalopathies (EEs). Interestingly, all three patients showed acute encephalopathy (febrile status epilepticus), with magnetic resonance imaging revealing hemisphere swelling or reduced diffusion in various brain regions. RHOBTB2 encodes Rho-related BTB domain-containing protein 2, an atypical Rho GTPase that is a substrate-specific adaptor or itself is a substrate for the Cullin-3 (CUL3)-based ubiquitin ligase complex. Transient expression experiments in Neuro-2a cells revealed that mutant RHOBTB2 was more abundant than wild-type RHOBTB2. Coexpression of CUL3 with RHOBTB2 decreased the level of wild-type RHOBTB2 but not the level of any of the three mutants, indicating impaired CUL3 complex-dependent degradation of the three mutants. These data indicate that RHOBTB2 variants are a rare genetic cause of EEs, in which acute encephalopathy might be a characteristic feature, and that precise regulation of RHOBTB2 levels is essential for normal brain function.

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