Whole-exome sequencing confirms implication of VPS13D as a potential cause of progressive spastic ataxia - Archive ouverte HAL Access content directly
Journal Articles BMC Neurology Year : 2022

Whole-exome sequencing confirms implication of VPS13D as a potential cause of progressive spastic ataxia

(1, 2) , (2) , (1, 2) , (2, 3) , (2, 1) , (2, 1) , (1, 2)
1
2
3

Abstract

Background: VPS13D is a large ubiquitin-binding protein playing an essential role in mitophagy by regulating mitochondrial fission. Recently, VPS13D biallelic pathogenic variants have been reported in patients displaying variable neurological phenotypes, with an autosomic recessive inheritance. The objectives of the study were to determine the genetic etiology of a patient with early onset sporadic progressive spastic ataxia, and to investigate the pathogenicity of VPS13D variants through functional studies on patient's skin fibroblasts. Case presentation: We report the case of a 51-year-old patient with spastic ataxia, with an acute onset of the disease at age 7. Walking difficulties slowly worsened over time, with the use of a wheelchair since age 26. We have used trio-based whole-exome sequencing (WES) to identify genes associated with spastic ataxia. The impact of the identified variants on mitochondrial function was assessed in patient's fibroblasts by imaging mitochondrial network and measuring level of individual OXPHOS complex subunits. Compound heterozygous variants were identified in VPS13D: c.946C > T, p.Arg316* and c.12416C > T, p.(Ala4139Val). Primary fibroblasts obtained from this patient revealed an altered mitochondrial morphology, and a decrease in levels of proteins from complex I, III and IV. Conclusions: Our findings confirmed implication of VPS13D in spastic ataxia and provided further support for mitochondrial defects in patient's skin fibroblasts with VPS13D variants. This report of long-term follow up showed a slowly progressive course of the spastic paraplegia with cerebellar features. Furthermore, the performed functional studies could be used as biomarker helping diagnosis of VPS13D-related neurological disorders when molecular results are uneasy to interpret.
Fichier principal
Vignette du fichier
s12883-022-02553-0.pdf (1.21 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

inserm-03689896 , version 1 (07-06-2022)

Identifiers

Cite

Christelle Durand, Chloé Angelini, Vincent Michaud, Claire Delleci, Isabelle Coupry, et al.. Whole-exome sequencing confirms implication of VPS13D as a potential cause of progressive spastic ataxia. BMC Neurology, 2022, 22 (1), pp.53. ⟨10.1186/s12883-022-02553-0⟩. ⟨inserm-03689896⟩

Collections

INSERM U1219
3 View
5 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More