Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease

Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease

Eva Bagyinszky,1,* YoungSoon Yang,2,* Vo Van Giau,1 Young Chul Youn,3 Seong Soo A An,1 SangYun Kim41Department of Bionano Technology, Gachon University, Sungnam, Korea; 2Department of Neurology, Veteran Health Service Medical Center, Seoul, Korea; 3Department of Neurology, Chungang University Hospit...

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Autores principales: Bagyinszky E, Yang Y, Giau VV, Youn YC, An SSA, Kim S
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2019
Materias:
prion
PRNP
Tyr225Cys mutation
atypical Creutzfeldt–Jakob disease
Creutzfeldt-Jakob Syndrome
sequencing
diagnosis
Geriatrics
RC952-954.6
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spelling oai:doaj.org-article:12d71818d7594d2e998cd211668d3a4f2021-12-02T01:35:22ZNovel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease1178-1998https://doaj.org/article/12d71818d7594d2e998cd211668d3a4f2019-08-01T00:00:00Zhttps://www.dovepress.com/novel-prion-mutation-ptyr225cys-in-a-korean-patient-with-atypical-creu-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Eva Bagyinszky,1,* YoungSoon Yang,2,* Vo Van Giau,1 Young Chul Youn,3 Seong Soo A An,1 SangYun Kim41Department of Bionano Technology, Gachon University, Sungnam, Korea; 2Department of Neurology, Veteran Health Service Medical Center, Seoul, Korea; 3Department of Neurology, Chungang University Hospital, Chungang University, Seoul, Korea; 4Department of Neurology, Seoul National University College of Medicine Seoul National University Bundang Hospital, Sungnam, Korea*These authors contributed equally to this workBackground: A novel prion variant, PRNP p.Tyr225Cys (c.674A>G; p.Y225C), was identified in an atypical Creutzfeldt–Jakob disease (CJD) patient. The patient had a 5-year history of progressive cognitive impairment with speech and gait disturbances. From the basic neurological examination at his first hospital visit, rigidity and myoclonic jerks in all limbs were observed without focal weakness. Electroencephalogram showed the diffuse slow continuous delta activity in the bilateral cerebral hemisphere. Magnetic resonance imaging revealed abnormalities in the brain, such as cortical signal changes and edema in the frontotemporoparietal lobes and the basal ganglia. Cerebrospinal fluid 14–3-3 protein analysis showed a weakly positive signal. Family history remained unclear, but the patient’s mother and sister were diagnosed with cognitive impairment but both refused genetic testing.Methods: Targeted next generation sequencing (NGS) was performed on 50 genes, involved in different neurodegeneratives diseases, such as Alzheimer’s, Parkinson’s, frontotemporal dementia or prion diseases. In silico analyses and structure predictions were performed on the potential patohgenic mutations.Results: NGS and standard sequencing revealed the novel PRNP p.Tyr225Cys mutation in the patient. Structure predictions revealed that this may make the helix more flexible. In addition, the extra cysteine residue in TM-III of prion protein may result in disturbances of natural disulfide bond.Conclusion: Hence, the pathogenicity of PRNP p.Tyr225Cys was not fully confirmed at present, and its penetrance was suggested to be low. However, its possible pathogenic nature in prion diseases cannot be ignored, since Tyr/Cys exchange could disturb the helix dynamics and contribute to conformational alteration and disease progression.Keywords: prion, PRNP, Tyr225Cys mutation, atypical Creutzfeldt–Jakob disease, Gerstmann–Sträussler–Scheinker syndrome, sequencing, diagnosisBagyinszky EYang YGiau VVYoun YCAn SSAKim SDove Medical PressarticleprionPRNPTyr225Cys mutationatypical Creutzfeldt–Jakob diseaseCreutzfeldt-Jakob SyndromesequencingdiagnosisGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 14, Pp 1387-1397 (2019)
institution DOAJ
collection DOAJ
language EN
topic prion
PRNP
Tyr225Cys mutation
atypical Creutzfeldt–Jakob disease
Creutzfeldt-Jakob Syndrome
sequencing
diagnosis
Geriatrics
RC952-954.6
spellingShingle prion
PRNP
Tyr225Cys mutation
atypical Creutzfeldt–Jakob disease
Creutzfeldt-Jakob Syndrome
sequencing
diagnosis
Geriatrics
RC952-954.6
Bagyinszky E
Yang Y
Giau VV
Youn YC
An SSA
Kim S
Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
description Eva Bagyinszky,1,* YoungSoon Yang,2,* Vo Van Giau,1 Young Chul Youn,3 Seong Soo A An,1 SangYun Kim41Department of Bionano Technology, Gachon University, Sungnam, Korea; 2Department of Neurology, Veteran Health Service Medical Center, Seoul, Korea; 3Department of Neurology, Chungang University Hospital, Chungang University, Seoul, Korea; 4Department of Neurology, Seoul National University College of Medicine Seoul National University Bundang Hospital, Sungnam, Korea*These authors contributed equally to this workBackground: A novel prion variant, PRNP p.Tyr225Cys (c.674A>G; p.Y225C), was identified in an atypical Creutzfeldt–Jakob disease (CJD) patient. The patient had a 5-year history of progressive cognitive impairment with speech and gait disturbances. From the basic neurological examination at his first hospital visit, rigidity and myoclonic jerks in all limbs were observed without focal weakness. Electroencephalogram showed the diffuse slow continuous delta activity in the bilateral cerebral hemisphere. Magnetic resonance imaging revealed abnormalities in the brain, such as cortical signal changes and edema in the frontotemporoparietal lobes and the basal ganglia. Cerebrospinal fluid 14–3-3 protein analysis showed a weakly positive signal. Family history remained unclear, but the patient’s mother and sister were diagnosed with cognitive impairment but both refused genetic testing.Methods: Targeted next generation sequencing (NGS) was performed on 50 genes, involved in different neurodegeneratives diseases, such as Alzheimer’s, Parkinson’s, frontotemporal dementia or prion diseases. In silico analyses and structure predictions were performed on the potential patohgenic mutations.Results: NGS and standard sequencing revealed the novel PRNP p.Tyr225Cys mutation in the patient. Structure predictions revealed that this may make the helix more flexible. In addition, the extra cysteine residue in TM-III of prion protein may result in disturbances of natural disulfide bond.Conclusion: Hence, the pathogenicity of PRNP p.Tyr225Cys was not fully confirmed at present, and its penetrance was suggested to be low. However, its possible pathogenic nature in prion diseases cannot be ignored, since Tyr/Cys exchange could disturb the helix dynamics and contribute to conformational alteration and disease progression.Keywords: prion, PRNP, Tyr225Cys mutation, atypical Creutzfeldt–Jakob disease, Gerstmann–Sträussler–Scheinker syndrome, sequencing, diagnosis
format article
author Bagyinszky E
Yang Y
Giau VV
Youn YC
An SSA
Kim S
author_facet Bagyinszky E
Yang Y
Giau VV
Youn YC
An SSA
Kim S
author_sort Bagyinszky E
title Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
title_short Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
title_full Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
title_fullStr Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
title_full_unstemmed Novel prion mutation (p.Tyr225Cys) in a Korean patient with atypical Creutzfeldt–Jakob disease
title_sort novel prion mutation (p.tyr225cys) in a korean patient with atypical creutzfeldt–jakob disease
publisher Dove Medical Press
publishDate 2019
url https://doaj.org/article/12d71818d7594d2e998cd211668d3a4f
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