%0 Journal Article
%T Genetic Landscape of Amyotrophic Lateral Sclerosis in Czech Patients.
%A Baumgartner D
%A Mušová Z
%A Zídková J
%A Hedvičáková P
%A Vlčková E
%A Joppeková L
%A Kramářová T
%A Fajkusová L
%A Stránecký V
%A Geryk J
%A Votýpka P
%A Mazanec R
%J J Neuromuscul Dis
%V 11
%N 5
%D 2024 Jul 25
%M 39058450
%F 4.693
%R 10.3233/JND-230236
%X UNASSIGNED: Genetic factors are involved in the pathogenesis of familial and sporadic amyotrophic lateral sclerosis (ALS) and constitute a link to its association with frontotemporal dementia (FTD). Gene-targeted therapies for some forms of ALS (C9orf72, SOD1) have recently gained momentum. Genetic architecture in Czech ALS patients has not been comprehensively assessed so far.
UNASSIGNED: We aimed to deliver pilot data on the genetic landscape of ALS in our country.
UNASSIGNED: A cohort of patients with ALS (n = 88), recruited from two Czech Neuromuscular Centers, was assessed for hexanucleotide repeat expansion (HRE) in C9orf72 and also for genetic variations in other 36 ALS-linked genes via next-generation sequencing (NGS). Nine patients (10.1%) had a familial ALS. Further, we analyzed two subgroups of sporadic patients - with concomitant FTD (n = 7) and with young-onset of the disease (n = 22).
UNASSIGNED: We detected the pathogenic HRE in C9orf72 in 12 patients (13.5%) and three other pathogenic variants in FUS, TARDBP and TBK1, each in one patient. Additional 7 novel and 9 rare known variants with uncertain causal significance have been detected in 15 patients. Three sporadic patients with FTD (42.9%) were harbouring a pathogenic variant (all HRE in C9orf72). Surprisingly, none of the young-onset sporadic patients harboured a pathogenic variant and we detected no pathogenic SOD1 variant in our cohort.
UNASSIGNED: Our findings resemble those from other European populations, with the highest prevalence of HRE in the C9orf72 gene. Further, our findings suggest a possibility of a missing genetic variability among young-onset patients.