1
|
Rafehi H, Szmulewicz DJ, Pope K, Wallis M, Christodoulou J, White SM, Delatycki MB, Lockhart PJ, Bahlo M. Rapid Diagnosis of Spinocerebellar Ataxia 36 in a Three-Generation Family Using Short-Read Whole-Genome Sequencing Data. Mov Disord 2020; 35:1675-1679. [PMID: 32407596 DOI: 10.1002/mds.28105] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 04/20/2020] [Accepted: 04/24/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Spinocerebellar ataxias are often caused by expansions of short tandem repeats. Recent methodological advances have made repeat expansion (RE) detection with whole-genome sequencing (WGS) feasible. OBJECTIVES The objective of this study was to determine the genetic basis of ataxia in a multigenerational Australian pedigree with autosomal-dominant inheritance. METHODS AND RESULTS WGS was performed on 3 affected relatives. The sequence data were screened for known pathogenic REs using 2 RE detection tools: exSTRa and ExpansionHunter. This screen provided a clear and rapid diagnosis (<5 days from receiving the sequencing data) of spinocerebellar ataxia 36, a rare form of ataxia caused by an intronic GGCCTG RE in NOP56. CONCLUSIONS The diagnosis of rare ataxias caused by REs is highly feasible and cost-effective with WGS. We propose that WGS could potentially be implemented as the frontline, cost-effective methodology for the molecular testing of individuals with a clinical diagnosis of ataxia. © 2020 International Parkinson and Movement Disorder Society.
Collapse
Affiliation(s)
- Haloom Rafehi
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia.,Department of Medical Biology, University of Melbourne, Melbourne, Victoria, Australia.,Epilepsy Research Centre, University of Melbourne, Austin Health, Melbourne, Victoria, Australia
| | - David J Szmulewicz
- Cerebellar Ataxia Clinic, Neuroscience Department, Alfred Health, Melbourne, Victoria, Australia.,Balance Disorders and Ataxia Service, Royal Victorian Eye & Ear Hospital, East Melbourne, Victoria, Australia
| | - Kate Pope
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | - Mathew Wallis
- Tasmanian Clinical Genetics Service, Tasmanian Health Service, Tasmania, Australia.,School of Medicine and Menzies Institute for Medical Research, University of Tasmania, Tasmania, Australia
| | - John Christodoulou
- Brain and Mitochondrial Research Group, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Pediatrics, The University of Melbourne, Parkville, Victoria, Australia
| | - Susan M White
- Department of Pediatrics, The University of Melbourne, Parkville, Victoria, Australia.,Victorian Clinical Genetics Services, Parkville, Victoria, Australia.,Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | - Martin B Delatycki
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Pediatrics, The University of Melbourne, Parkville, Victoria, Australia.,Victorian Clinical Genetics Services, Parkville, Victoria, Australia
| | - Paul J Lockhart
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Pediatrics, The University of Melbourne, Parkville, Victoria, Australia
| | - Melanie Bahlo
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia.,Department of Medical Biology, University of Melbourne, Melbourne, Victoria, Australia
| |
Collapse
|