Adult onset neurodegenerative disorder
Gene: FMR1
In FXTAS, the expanded repeats range in size from 55 to 200 repeats and are referred to as 'premutations;' full repeat expansions with greater than 200 repeats results in fragile X syndrome. The penetrance of FXTAS in male carriers aged 50 years and over, ascertained through families with a fragile X syndrome proband, is at least 33% (Hagerman and Hagerman, 2004); its penetrance in female carriers is approximately 5-10% (Greco et al., 2008). WGS may not be the best testing strategy.Created: 2 Sep 2019, 4:06 p.m. | Last Modified: 2 Sep 2019, 4:06 p.m.
Panel Version: 1.99
Mode of inheritance
X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Phenotypes
FMR1-related disorders include fragile X syndrome, fragile X-associated tremor/ataxia syndrome (FXTAS), and FMR1-related premature ovarian insufficiency (POI); males with a tremor phenotype; FragileXtremor/ataxiasyndrome,300623
Mode of pathogenicity
Other - please provide details in the comments
Symptoms identical to expansionsCreated: 23 Jul 2019, 3:35 p.m. | Last Modified: 23 Jul 2019, 3:35 p.m.
Panel Version: 1.72
Mode of inheritance
X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Phenotypes
FMR1-related disorders include fragile X syndrome, fragile X-associated tremor/ataxia syndrome (FXTAS), and FMR1-related premature ovarian insufficiency (POI); males with a tremor phenotype; FragileXtremor/ataxiasyndrome,300623
Publications
As discussed with the GMS Neurology Specialist Test Group webex call 11th September 2019: The Specialist Test Group all agreed that there is only enough evidence to rate this gene RedCreated: 20 Sep 2019, 4:19 p.m. | Last Modified: 20 Sep 2019, 4:19 p.m.
Panel Version: 1.106
Review and rating from Tracy Lester (Oxford Medical Genetics Laboratories Oxford University Hospitals NHS Foundation Trust) on behalf of Wessex and West Midlands GLH for GMS Neurology specialist test group. All the green and amber, except for the genes with triplet repeats, were reviewed.Created: 2 Sep 2019, 4:46 p.m. | Last Modified: 2 Sep 2019, 4:46 p.m.
Panel Version: 1.101
Review and rating submitted by Nick Beauchamp (Sheffield Diagnostic genetics Service), on behalf of Yorkshire and North East GLH for GMS Neurology specialist test group.Created: 23 Jul 2019, 3:51 p.m. | Last Modified: 23 Jul 2019, 3:51 p.m.
Panel Version: 1.74
Review and rating submitted byJames Polke (North Bristol NHS Trust), unless specified in the review comment, on behalf of London North GLH for GMS Neurology specialist test group.Created: 23 Apr 2019, 5:35 p.m.
Phenotypes for gene: FMR1 were changed from FMR1-related disorders include fragile X syndrome, fragile X-associated tremor/ataxia syndrome (FXTAS), and FMR1-related premature ovarian insufficiency (POI); males with a tremor phenotype; FragileXtremor/ataxiasyndrome,300623 to Fragile X syndrome, OMIM:300624; Fragile X tremor/ataxia syndrome, OMIM:300623
Source Expert Review Red was added to FMR1. Rating Changed from Green List (high evidence) to Red List (low evidence)
Source Wessex and West Midlands GLH was added to FMR1.
Publications for gene FMR1 were changed from to 28176767
Source Yorkshire and North East GLH was added to FMR1.
Source NHS GMS was added to FMR1.
Source London North GLH was added to FMR1.
Louise Daugherty: Comment on phenotypes: amended
Tag nucleotide-repeat-expansion tag was added to gene: FMR1.
gene: FMR1 was added gene: FMR1 was added to Neurodegenerative disorders - adult onset. Sources: Expert Review Green Mode of inheritance for gene: FMR1 was set to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) Phenotypes for gene: FMR1 were set to FMR1-related disorders include fragile X syndrome, fragile X-associated tremor/ataxia syndrome (FXTAS), and FMR1-related premature ovarian insufficiency (POI); males with a tremor phenotype; FragileXtremor/ataxiasyndrome,300623