Adult onset neurodegenerative disorder

Gene: CACNA1A

Comment on mode of inheritance: CACNA1A is associated with several phenotypes including SCA6 (OMIM:183086), episodic ataxia (OMIM:108500), familial hemiplegic migraine with or without ataxia (OMIM:141500), or developmental and epileptic encephalopathy (OMIM:617106). SCA6 is the only condition that may align with this panel; however, it is caused by nucleotide repeat expansions and there is a lack of relevance for SNVs.

Created: 8 Nov 2021, 2:18 p.m. | Last Modified: 8 Nov 2021, 2:18 p.m.

Panel Version: 2.223

Green List (high evidence)

SCA6 - late-onset progressive cerebellar ataxia with onset of gait difficulties at age 50, as well as other variable phenotypes. >3 cases, SCA6 - STR mutation. , eg EIEE42, EA2, FHM1. In approximately 20% of cases of FHM, the disease is associated with a mild permanent cerebellar ataxia which may be progressive (PCA) - 10 unrelated cases had the same T666M variant. oTher variants also reported. Episodic ataxia is a genetically heterogeneous neurologic condition characterized by spells of incoordination and imbalance, often associated with progressive ataxia - LOF variants. Several cases

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

Panel Version: 1.99

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
episodic ataxia type 2 (EA2),108500; familial hemiplegic migraine type 1, 141500; Migraine, familial hemiplegic, 1, with progressive cerebellar ataxia; Dystonia; Spinocerebellar ataxia 6; Episodic ataxia, type 2

Red List (low evidence)

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
episodic ataxia type 2 (EA2),108500; familial hemiplegic migraine type 1, 141500; Migraine, familial hemiplegic, 1, with progressive cerebellar ataxia; Dystonia; Spinocerebellar ataxia 6; Episodic ataxia, type 2

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)