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Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene

Spinocerebellar ataxia (SCA) 40 is an extremely rare subtype of the phenotypically and genetically diverse autosomal dominant ataxias caused by mutations of the CCDC88C gene. Most reported cases of SCA40 are characterized by late-onset cerebellar ataxia and variable extrapyramidal features; however,...

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Autores principales: Boros, Fanni Annamária, Szpisjak, László, Bozó, Renáta, Kelemen, Evelyn, Zádori, Dénes, Salamon, András, Danis, Judit, Kalmár, Tibor, Maróti, Zoltán, Molnár, Mária Judit, Klivényi, Péter, Széll, Márta, Ádám, Éva
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9916980/
https://www.ncbi.nlm.nih.gov/pubmed/36768938
http://dx.doi.org/10.3390/ijms24032617
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author Boros, Fanni Annamária
Szpisjak, László
Bozó, Renáta
Kelemen, Evelyn
Zádori, Dénes
Salamon, András
Danis, Judit
Kalmár, Tibor
Maróti, Zoltán
Molnár, Mária Judit
Klivényi, Péter
Széll, Márta
Ádám, Éva
author_facet Boros, Fanni Annamária
Szpisjak, László
Bozó, Renáta
Kelemen, Evelyn
Zádori, Dénes
Salamon, András
Danis, Judit
Kalmár, Tibor
Maróti, Zoltán
Molnár, Mária Judit
Klivényi, Péter
Széll, Márta
Ádám, Éva
author_sort Boros, Fanni Annamária
collection PubMed
description Spinocerebellar ataxia (SCA) 40 is an extremely rare subtype of the phenotypically and genetically diverse autosomal dominant ataxias caused by mutations of the CCDC88C gene. Most reported cases of SCA40 are characterized by late-onset cerebellar ataxia and variable extrapyramidal features; however, there is a report of a patient with early-onset spastic paraparesis as well. Here, we describe a novel missense CCDC88C mutation (p.R203W) in the hook domain of the DAPLE protein encoded by the CCDC88C gene that was identified in a female patient who developed late-onset ataxia, dysmetria and intention tremor. To explore the molecular consequences of the newly identified and previously described CCDC88C mutations, we carried out in vitro functional tests. The CCDC88C alleles were expressed in HEK293 cells, and the impact of the mutant DAPLE protein variants on JNK pathway activation and apoptosis was assessed. Our results revealed only a small-scale activation of the JNK pathway by mutant DAPLE proteins; however, increased JNK1 phosphorylation could not be detected. Additionally, none of the examined mutations triggered proapoptotic effect. In conclusion, we identified a novel mutation of the CCDC88C gene from a patient with spinocerebellar ataxia. Our results are not in accord with previous observations and do not support the primary role of the CCDC88C mutations in induction of JNK pathway activation in ataxia. Therefore, we propose that CCDC88C mutations may exert their effects through different and possibly in much broader, yet unexplored, biological processes.
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spelling pubmed-99169802023-02-11 Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene Boros, Fanni Annamária Szpisjak, László Bozó, Renáta Kelemen, Evelyn Zádori, Dénes Salamon, András Danis, Judit Kalmár, Tibor Maróti, Zoltán Molnár, Mária Judit Klivényi, Péter Széll, Márta Ádám, Éva Int J Mol Sci Article Spinocerebellar ataxia (SCA) 40 is an extremely rare subtype of the phenotypically and genetically diverse autosomal dominant ataxias caused by mutations of the CCDC88C gene. Most reported cases of SCA40 are characterized by late-onset cerebellar ataxia and variable extrapyramidal features; however, there is a report of a patient with early-onset spastic paraparesis as well. Here, we describe a novel missense CCDC88C mutation (p.R203W) in the hook domain of the DAPLE protein encoded by the CCDC88C gene that was identified in a female patient who developed late-onset ataxia, dysmetria and intention tremor. To explore the molecular consequences of the newly identified and previously described CCDC88C mutations, we carried out in vitro functional tests. The CCDC88C alleles were expressed in HEK293 cells, and the impact of the mutant DAPLE protein variants on JNK pathway activation and apoptosis was assessed. Our results revealed only a small-scale activation of the JNK pathway by mutant DAPLE proteins; however, increased JNK1 phosphorylation could not be detected. Additionally, none of the examined mutations triggered proapoptotic effect. In conclusion, we identified a novel mutation of the CCDC88C gene from a patient with spinocerebellar ataxia. Our results are not in accord with previous observations and do not support the primary role of the CCDC88C mutations in induction of JNK pathway activation in ataxia. Therefore, we propose that CCDC88C mutations may exert their effects through different and possibly in much broader, yet unexplored, biological processes. MDPI 2023-01-30 /pmc/articles/PMC9916980/ /pubmed/36768938 http://dx.doi.org/10.3390/ijms24032617 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Boros, Fanni Annamária
Szpisjak, László
Bozó, Renáta
Kelemen, Evelyn
Zádori, Dénes
Salamon, András
Danis, Judit
Kalmár, Tibor
Maróti, Zoltán
Molnár, Mária Judit
Klivényi, Péter
Széll, Márta
Ádám, Éva
Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title_full Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title_fullStr Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title_full_unstemmed Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title_short Spinocerebellar Ataxia in a Hungarian Female Patient with a Novel Variant of Unknown Significance in the CCDC88C Gene
title_sort spinocerebellar ataxia in a hungarian female patient with a novel variant of unknown significance in the ccdc88c gene
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9916980/
https://www.ncbi.nlm.nih.gov/pubmed/36768938
http://dx.doi.org/10.3390/ijms24032617
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