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NM_000217.3(KCNA1):c.1046C>A (p.Ala349Glu) AND Episodic ataxia type 1

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Sep 15, 2021
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
Somatic classification
of clinical impact:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:
current
Accession:
RCV001921215.3

Allele description

NM_000217.3(KCNA1):c.1046C>A (p.Ala349Glu)

Gene:
KCNA1:potassium voltage-gated channel subfamily A member 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
12p13.32
Genomic location:
Preferred name:
NM_000217.3(KCNA1):c.1046C>A (p.Ala349Glu)
HGVS:
  • NC_000012.12:g.4912424C>A
  • NG_011815.1:g.7518C>A
  • NM_000217.3:c.1046C>AMANE SELECT
  • NP_000208.2:p.Ala349Glu
  • LRG_1297t1:c.1046C>A
  • LRG_1297:g.7518C>A
  • LRG_1297p1:p.Ala349Glu
  • NC_000012.11:g.5021590C>A
Protein change:
A349E
Links:
dbSNP: rs1361446640
NCBI 1000 Genomes Browser:
rs1361446640
Molecular consequence:
  • NM_000217.3:c.1046C>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Episodic ataxia type 1 (EA1)
Synonyms:
ATAXIA, EPISODIC, WITH MYOKYMIA; MYOKYMIA WITH PERIODIC ATAXIA; PAROXYSMAL ATAXIA WITH NEUROMYOTONIA, HEREDITARY; See all synonyms [MedGen]
Identifiers:
MONDO: MONDO:0008047; MedGen: C1719788; Orphanet: 972; OMIM: 160120

Recent activity

Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV002189388Invitae
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Sep 15, 2021) 		germlineclinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]
PMID:
28492532
PMCID:
PMC5632818

Details of each submission

From Invitae, SCV002189388.3

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (1)

Description

This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with glutamic acid at codon 349 of the KCNA1 protein (p.Ala349Glu). The alanine residue is highly conserved and there is a moderate physicochemical difference between alanine and glutamic acid. This variant has not been reported in the literature in individuals affected with KCNA1-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15").

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Jun 29, 2024