A de novo STUB1 variant associated with an early adult-onset multisystemic ataxia phenotype
| العنوان: | A de novo STUB1 variant associated with an early adult-onset multisystemic ataxia phenotype |
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| المؤلفون: | Friedemann Bender, Tobias B. Haack, Alejandra Leyva-Gutiérrez, Stefan Hauser, Selina Reich, Matthis Synofzik, Andreas Traschütz, David Mengel |
| المصدر: | Journal of Neurology J Neurol Journal of neurology 268(10), 3845-3851 (2021). doi:10.1007/s00415-021-10524-7 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Adult, 0301 basic medicine, Spastic gait, Ataxia, Cerebellar Ataxia, Ubiquitin-Protein Ligases, Early-onset ataxia, Disease, 030105 genetics & heredity, Biology, 03 medical and health sciences, symbols.namesake, 0302 clinical medicine, SCA48, medicine, Humans, Spinocerebellar Ataxias, Dominant, ddc:610, Index case, Exome sequencing, genetics [Ubiquitin-Protein Ligases], Genetics, Sanger sequencing, Original Communication, CHIP, genetics [Ataxia], medicine.disease, Phenotype, Pedigree, Neurology, symbols, Neurology (clinical), medicine.symptom, STUB1, Myoclonus, 030217 neurology & neurosurgery |
| الوصف: | Background Biallelic STUB1 variants are a well-established cause of autosomal-recessive early-onset multisystemic ataxia (SCAR16). Evidence for STUB1 variants causing autosomal-dominant ataxia (SCA48) so far largely relies on segregation data in larger families. Presenting the first de novo occurrence of a heterozygous STUB1 variant, we here present additional qualitative evidence for STUB1-disease as an autosomal-dominant disorder. Methods Whole exome sequencing on an index patient with sporadic early-onset ataxia, followed by Sanger sequencing in all family members, was used to identify causative variants as well as to rule out alternative genetic hits and intronic STUB1 variants. STUB1 mRNA and protein levels in PBMCs in all family members were analysed using qRT-PCR and Western Blot. Results A previously unreported start-lost loss-of-function variant c.3G>A in the start codon of STUB1 was identified in the index case, occurring de novo and without evidence for a second (potentially missed) variant (e.g., intronic or copy number) in STUB1. The patient showed an early adult-onset multisystemic ataxia complicated by spastic gait disorder, distal myoclonus and cognitive dysfunction, thus closely mirroring the systems affected in autosomal-recessive STUB1-associated disease. In line with the predicted start-lost effect of the variant, functional investigations demonstrated markedly reduced STUB1 protein expression in PBMCs, whereas mRNA levels were intact. Conclusion De novo occurrence of the loss-of-function STUB1 variant in our case with multisystemic ataxia provides a qualitatively additional line of evidence for STUB1-disease as an autosomal-dominant disorder, in which the same neurological systems are affected as in its autosomal-recessive counterpart. Moreover, this finding adds support for loss-of-function as a mechanism underlying autosomal-dominant STUB1-disease, thus mirroring its autosomal-recessive counterpart also in terms of the underlying mutational mechanism. |
| تدمد: | 1432-1459 0340-5354 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0430d5db90a8dd946a2daa5a95067d5e https://doi.org/10.1007/s00415-021-10524-7 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....0430d5db90a8dd946a2daa5a95067d5e |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14321459 03405354 |
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