NM_004519.4(KCNQ3):c.2478G>C (p.Trp826Cys) AND Benign neonatal seizures

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Feb 1, 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:: RCV001949985.5

Allele description [Variation Report for NM_004519.4(KCNQ3):c.2478G>C (p.Trp826Cys)]

NM_004519.4(KCNQ3):c.2478G>C (p.Trp826Cys)

Gene:

KCNQ3:potassium voltage-gated channel subfamily Q member 3 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

8q24.22

Genomic location:

Preferred name:

NM_004519.4(KCNQ3):c.2478G>C (p.Trp826Cys)

HGVS:

NC_000008.11:g.132129403C>G
NG_008854.2:g.356355G>C
NM_001204824.2:c.2118G>C
NM_004519.4:c.2478G>CMANE SELECT
NP_001191753.1:p.Trp706Cys
NP_004510.1:p.Trp826Cys
NC_000008.10:g.133141650C>G

Protein change:

W706C

Links:

dbSNP: rs2130922724

NCBI 1000 Genomes Browser:

rs2130922724

Molecular consequence:

NM_001204824.2:c.2118G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_004519.4:c.2478G>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Benign neonatal seizures
Synonyms:: Benign familial neonatal seizures; Convulsions benign familial neonatal dominant form; Autosomal dominant form of benign neonatal seizures; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0016027; MedGen: C0220669; Orphanet: 1949; OMIM: PS121200

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002198158	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Feb 1, 2021)	germline	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

SCV002198158

Invitae

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Feb 1, 2021)

germline

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

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):240-242.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Invitae, SCV002198158.3

#	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 KCNQ3 protein function. This variant has been observed in individual(s) with clinical features of KCNQ3-related conditions (Invitae). This variant is not present in population databases (ExAC no frequency). This sequence change replaces tryptophan with cysteine at codon 826 of the KCNQ3 protein (p.Trp826Cys). The tryptophan residue is highly conserved and there is a large physicochemical difference between tryptophan and cysteine.

#	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

Last Updated: Apr 15, 2024

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