Journal article
Functional characterization of variants of unknown significance in a spinocerebellar ataxia patient using an unsupervised machine learning pipeline
Human genome variation, Vol.9(1), 10
04/14/2022
DOI: 10.1038/s41439-022-00188-8
PMCID: PMC9010413
PMID: 35422034
Abstract
CAG-expanded ATXN7 has been previously defined in the pathogenesis of spinocerebellar ataxia type 7 (SCA7), a polyglutamine expansion autosomal dominant cerebellar ataxia. Pathology in SCA7 occurs as a result of a CAG triplet repeat expansion in excess of 37 in the first exon of ATXN7, which encodes ataxin-7. SCA7 presents clinically with spinocerebellar ataxia and cone-rod dystrophy. Here, we present a novel spinocerebellar ataxia variant occurring in a patient with mutations in both ATXN7 and TOP1MT, which encodes mitochondrial topoisomerase I (top1mt). Using machine-guided, unbiased microscopy image analysis, we demonstrate alterations in ataxin-7 subcellular localization, and through high-fidelity measurements of cellular respiration, bioenergetic defects in association with top1mt mutations. We identify ataxin-7 Q35P and top1mt R111W as deleterious mutations, potentially contributing to disease states. We recapitulate our mutations through Drosophila genetic models. Our work provides important insight into the cellular biology of ataxin-7 and top1mt and offers insight into the pathogenesis of spinocerebellar ataxia applicable to multiple subtypes of the illness. Moreover, our study demonstrates an effective pipeline for the characterization of previously unreported genetic variants at the level of cell biology.
Details
- Title: Subtitle
- Functional characterization of variants of unknown significance in a spinocerebellar ataxia patient using an unsupervised machine learning pipeline
- Creators
- Siddharth Nath - McMaster UniversityNicholas S Caron - British Columbia Children's HospitalLinda May - McMaster UniversityOxana B Gluscencova - University of TorontoJill Kolesar - University of PittsburghLauren Brady - Hamilton Health SciencesBrett A Kaufman - University of PittsburghGabrielle L Boulianne - University of TorontoAmadeo R Rodriguez - McMaster UniversityMark A Tarnopolsky - McMaster UniversityRay Truant - McMaster University
- Resource Type
- Journal article
- Publication Details
- Human genome variation, Vol.9(1), 10
- DOI
- 10.1038/s41439-022-00188-8
- PMID
- 35422034
- PMCID
- PMC9010413
- ISSN
- 2054-345X
- eISSN
- 2054-345X
- Grant note
- PJT153063 / Gouvernement du Canada | Instituts de Recherche en Santé du Canada | CIHR Skin Research Training Centre (Skin Research Training Centre) kf001 / Krembil Foundation
- Language
- English
- Date published
- 04/14/2022
- Academic Unit
- Pharmacy; Pharmaceutical Sciences and Experimental Therapeutics
- Record Identifier
- 9984695800402771
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