A Variation in FGF14 Is Associated with Downbeat Nystagmus in a Genome-Wide Association Study

Downbeat nystagmus (DBN) is a frequent form of acquired persisting central fixation nystagmus, often associated with other cerebellar ocular signs, such as saccadic smooth pursuit or gaze-holding deficits. Despite its distinct clinical features, the underlying etiology of DBN often remains unclear....

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Veröffentlicht in:Cerebellum (London, England) England), 2020-06, Vol.19 (3), p.348-357
Hauptverfasser: Strupp, Michael, Maul, Stephan, Konte, Bettina, Hartmann, Annette M., Giegling, Ina, Wollenteit, Sophia, Feil, Katharina, Rujescu, Dan
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container_issue 3
container_start_page 348
container_title Cerebellum (London, England)
container_volume 19
creator Strupp, Michael
Maul, Stephan
Konte, Bettina
Hartmann, Annette M.
Giegling, Ina
Wollenteit, Sophia
Feil, Katharina
Rujescu, Dan
description Downbeat nystagmus (DBN) is a frequent form of acquired persisting central fixation nystagmus, often associated with other cerebellar ocular signs, such as saccadic smooth pursuit or gaze-holding deficits. Despite its distinct clinical features, the underlying etiology of DBN often remains unclear. Therefore, a genome-wide association study (GWAS) was conducted in 106 patients and 2609 healthy controls of European ancestry to identify genetic variants associated with DBN. A genome-wide significant association ( p  
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Despite its distinct clinical features, the underlying etiology of DBN often remains unclear. Therefore, a genome-wide association study (GWAS) was conducted in 106 patients and 2609 healthy controls of European ancestry to identify genetic variants associated with DBN. A genome-wide significant association ( p  &lt; 5 × 10 −8 ) with DBN was found for a variation on chromosome 13 located within the fibroblast growth factor 14 gene (FGF14). FGF14 is expressed in Purkinje cells (PCs) and a reduction leads to a decreased spontaneous firing rate and excitability of PCs, compatible with the pathophysiology of DBN. In addition, mutations in the FGF14 gene cause spinocerebellar ataxia type 27. Suggestive associations ( p  &lt; 1 × 10 −05 ) could be detected for 15 additional LD-independent loci, one of which is also located in the FGF14 gene. An association of a region containing the dihydrofolate reductase (DHFR) and MutS Homolog 3 (MSH3) genes on chromosome 5 was slightly below the genome-wide significance threshold. DHFR is relevant for neuronal regulation, and a dysfunction is known to induce cerebellar damage. Among the remaining twelve suggestive associations, four genes (MAST4, TPPP, FTMT, and IDS) seem to be involved in cerebral pathological processes. 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An association of a region containing the dihydrofolate reductase (DHFR) and MutS Homolog 3 (MSH3) genes on chromosome 5 was slightly below the genome-wide significance threshold. DHFR is relevant for neuronal regulation, and a dysfunction is known to induce cerebellar damage. Among the remaining twelve suggestive associations, four genes (MAST4, TPPP, FTMT, and IDS) seem to be involved in cerebral pathological processes. 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Despite its distinct clinical features, the underlying etiology of DBN often remains unclear. Therefore, a genome-wide association study (GWAS) was conducted in 106 patients and 2609 healthy controls of European ancestry to identify genetic variants associated with DBN. A genome-wide significant association ( p  &lt; 5 × 10 −8 ) with DBN was found for a variation on chromosome 13 located within the fibroblast growth factor 14 gene (FGF14). FGF14 is expressed in Purkinje cells (PCs) and a reduction leads to a decreased spontaneous firing rate and excitability of PCs, compatible with the pathophysiology of DBN. In addition, mutations in the FGF14 gene cause spinocerebellar ataxia type 27. Suggestive associations ( p  &lt; 1 × 10 −05 ) could be detected for 15 additional LD-independent loci, one of which is also located in the FGF14 gene. An association of a region containing the dihydrofolate reductase (DHFR) and MutS Homolog 3 (MSH3) genes on chromosome 5 was slightly below the genome-wide significance threshold. DHFR is relevant for neuronal regulation, and a dysfunction is known to induce cerebellar damage. Among the remaining twelve suggestive associations, four genes (MAST4, TPPP, FTMT, and IDS) seem to be involved in cerebral pathological processes. Thus, this GWAS analysis has identified a potential genetic contribution to idiopathic DBN, including suggestive associations to several genes involved in postulated pathological mechanisms of DBN (i.e., impaired function of cerebellar PCs).</abstract><cop>New York</cop><pub>Springer US</pub><pmid>32157568</pmid><doi>10.1007/s12311-020-01113-x</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-0668-797X</orcidid><oa>free_for_read</oa></addata></record>
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subjects Aged
Aged, 80 and over
Biomedical and Life Sciences
Biomedicine
Cerebellum
Chromosome 13
Chromosome 5
Dihydrofolate reductase
Etiology
Excitability
Female
Fibroblast growth factors
Fibroblast Growth Factors - genetics
Firing rate
Genes
Genetic analysis
Genetic diversity
Genetic Variation - genetics
Genome-wide association studies
Genome-Wide Association Study - methods
Genomes
Germany - epidemiology
Humans
Male
Middle Aged
Neurobiology
Neurology
Neurosciences
Nystagmus
Nystagmus, Pathologic - diagnosis
Nystagmus, Pathologic - epidemiology
Nystagmus, Pathologic - genetics
Original Paper
Purkinje cells
title A Variation in FGF14 Is Associated with Downbeat Nystagmus in a Genome-Wide Association Study
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