Adult onset neurodegenerative disorder

Gene: FXN

Red List (low evidence)

Friedreich ataxia is an autosomal recessive neurodegenerative disorder characterized by progressive gait and limb ataxia with associated limb muscle weakness, absent lower limb reflexes, extensor plantar responses, dysarthria, and decreased vibratory sense and proprioception. Onset is usually in the first or second decade, before the end of puberty. The most common molecular abnormality is a GAA trinucleotide repeat expansion in intron 1 of the FXN gene: normal individuals have 5 to 30 GAA repeat expansions, whereas affected individuals have from 70 to more than 1,000 GAA triplets: not detected by WGS? Childhood onset, so red?

Created: 2 Sep 2019, 4:06 p.m. | Last Modified: 2 Sep 2019, 4:06 p.m.

Panel Version: 1.99

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Friedreichataxia,229300Friedreichataxiawithretainedreflexes,229300

Mode of pathogenicity
Other - please provide details in the comments

Red List (low evidence)

Neurodegeneration not feature of disease.

Created: 23 Jul 2019, 3:35 p.m. | Last Modified: 23 Jul 2019, 3:35 p.m.

Panel Version: 1.72

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Friedreichataxia,229300Friedreichataxiawithretainedreflexes, 229300

Red List (low evidence)

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 Red

Created: 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.

Red List (low evidence)