Heterozygous UCHL1 loss-of-function variants cause a neurodegenerative disorder with spasticity, ataxia, neuropathy, and optic atrophy
- PMID: 35986737
- DOI: 10.1016/j.gim.2022.07.006
Heterozygous UCHL1 loss-of-function variants cause a neurodegenerative disorder with spasticity, ataxia, neuropathy, and optic atrophy
Erratum in
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Heterozygous UCHL1 loss-of-function variants cause a neurodegenerative disorder with spasticity, ataxia, neuropathy, and optic atrophy.Genet Med. 2023 Oct;25(10):100961. doi: 10.1016/j.gim.2023.100961. Epub 2023 Aug 31. Genet Med. 2023. PMID: 37650884 No abstract available.
Abstract
Purpose: Biallelic variants in UCHL1 have been associated with a progressive early-onset neurodegenerative disorder, autosomal recessive spastic paraplegia type 79. In this study, we investigated heterozygous UCHL1 variants on the basis of results from cohort-based burden analyses.
Methods: Gene-burden analyses were performed on exome and genome data of independent cohorts of patients with hereditary ataxia and spastic paraplegia from Germany and the United Kingdom in a total of 3169 patients and 33,141 controls. Clinical data of affected individuals and additional independent families were collected and evaluated. Patients' fibroblasts were used to perform mass spectrometry-based proteomics.
Results: UCHL1 was prioritized in both independent cohorts as a candidate gene for an autosomal dominant disorder. We identified a total of 34 cases from 18 unrelated families, carrying 13 heterozygous loss-of-function variants (15 families) and an inframe insertion (3 families). Affected individuals mainly presented with spasticity (24/31), ataxia (28/31), neuropathy (11/21), and optic atrophy (9/17). The mass spectrometry-based proteomics showed approximately 50% reduction of UCHL1 expression in patients' fibroblasts.
Conclusion: Our bioinformatic analysis, in-depth clinical and genetic workup, and functional studies established haploinsufficiency of UCHL1 as a novel disease mechanism in spastic ataxia.
Keywords: Gene burden; Proteomics; Spastic ataxia; UCHL1.
Copyright © 2022 American College of Medical Genetics and Genomics. All rights reserved.
Conflict of interest statement
Conflict of Interest The authors declare no conflicts of interest.
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- MR/S006753/1/MRC_/Medical Research Council/United Kingdom
- MR/N025431/1 /MRC_/Medical Research Council/United Kingdom
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- MR/S035699/1/MRC_/Medical Research Council/United Kingdom
- MC_UP_1501/2/MRC_/Medical Research Council/United Kingdom
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- 109915/Z/15/Z/WT_/Wellcome Trust/United Kingdom
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- 212219/Z/18/Z/WT_/Wellcome Trust/United Kingdom
- MC_UU_00028/7/MRC_/Medical Research Council/United Kingdom
- MR/M008886/1/MRC_/Medical Research Council/United Kingdom
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