| Autor: |
Haj Salem, Ikhlass, Beaudin, Marie, Stumpf, Monica, Estiar, Mehrdad A., Côté, Pierre-Olivier, Brunet, Francis, Gamache, Pierre-Luc, Rouleau, Guy A., Mourabit-Amari, Karim, Gan-Or, Ziv, Dupré, Nicolas |
| Zdroj: |
The Canadian Journal of Neurological Sciences; September 2021, Vol. 48 Issue: 5 p655-665, 11p |
| Abstrakt: |
ABSTRACT:Objective:To estimate the minimum prevalence of adult hereditary ataxias (HA) and spastic paraplegias (HSP) in Eastern Quebec and to evaluate the proportion of associated mutations in identified genes.Methods:We conducted a descriptive cross-sectional study of patients who met clinical criteria for the diagnosis of HA (n= 241) and HSP (n= 115) in the East of the Quebec province between January 2007 and July 2019. The primary outcome was the prevalence per 100,000 persons with a 95% confidence interval (CI). The secondary outcome was the frequency of mutations identified by targeted next-generation sequencing (NGS) approach. Minimum carrier frequency for identified variants was calculated based on allele frequency values and the Hardy–Weinberg (HW) equation.Results:The minimum prevalence of HA in Eastern Quebec was estimated at 6.47/100 000 [95% CI; 6.44–6.51]; divided into 3.73/100 000 for autosomal recessive (AR) ataxias and 2.67/100 000 for autosomal dominant (AD) ataxias. The minimum prevalence of HSP was 4.17/100 000 [95% CI; 4.14–4.2]; with 2.05/100 000 for AD-HSP and 2.12/100 000 for AR-HSP. In total, 52.4% of patients had a confirmed genetic diagnosis. AR cerebellar ataxia type 1 (2.67/100 000) and AD spastic paraplegia SPG4 (1.18/100 000) were the most prevalent disorders identified. Mutations were identified in 23 genes and molecular alterations in 7 trinucleotides repeats expansion; the most common mutations were c.15705–12 A > G in SYNE1and c.1529C > T (p.A510V) in SPG7.Conclusions:We described the minimum prevalence of genetically defined adult HA and HSP in Eastern Quebec. This study provides a framework for international comparisons and service planning. |
| Databáze: |
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