NM_000217.3(KCNA1):c.1333A>G (p.Ser445Gly) AND Episodic ataxia type 1

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Jan 6, 2023
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV002049284.7

Allele description [Variation Report for NM_000217.3(KCNA1):c.1333A>G (p.Ser445Gly)]

NM_000217.3(KCNA1):c.1333A>G (p.Ser445Gly)

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.1333A>G (p.Ser445Gly)

Other names:

p.Ser445Gly

HGVS:

NC_000012.12:g.4912711A>G
NG_011815.1:g.7805A>G
NM_000217.3:c.1333A>GMANE SELECT
NP_000208.2:p.Ser445Gly
LRG_1297t1:c.1333A>G
LRG_1297:g.7805A>G
LRG_1297p1:p.Ser445Gly
NC_000012.11:g.5021877A>G

Protein change:

S445G

Links:

dbSNP: rs768749436

NCBI 1000 Genomes Browser:

rs768749436

Molecular consequence:

NM_000217.3:c.1333A>G - 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

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002112741	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 6, 2023)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002782092	Fulgent Genetics, Fulgent Genetics	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Nov 2, 2021)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002112741

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 6, 2023)

germline

clinical testing

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

SCV002782092

Fulgent Genetics, Fulgent Genetics

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain significance
(Nov 2, 2021)

unknown

clinical testing

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

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	unknown	unknown	not provided	not provided	not provided	not provided	not provided	clinical 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

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee.

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV002112741.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt KCNA1 protein function. ClinVar contains an entry for this variant (Variation ID: 1351662). This variant has not been reported in the literature in individuals affected with KCNA1-related conditions. This variant is present in population databases (rs768749436, gnomAD 0.003%). This sequence change replaces serine, which is neutral and polar, with glycine, which is neutral and non-polar, at codon 445 of the KCNA1 protein (p.Ser445Gly).

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Fulgent Genetics, Fulgent Genetics, SCV002782092.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	unknown	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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