NM_000218.3(KCNQ1):c.1375G>A (p.Asp459Asn) AND Long QT syndrome

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Dec 29, 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:: RCV001071913.15

Allele description [Variation Report for NM_000218.3(KCNQ1):c.1375G>A (p.Asp459Asn)]

NM_000218.3(KCNQ1):c.1375G>A (p.Asp459Asn)

Gene:

KCNQ1:potassium voltage-gated channel subfamily Q member 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

11p15.5

Genomic location:

Preferred name:

NM_000218.3(KCNQ1):c.1375G>A (p.Asp459Asn)

HGVS:

NC_000011.10:g.2588836G>A
NG_008935.1:g.148846G>A
NM_000218.3:c.1375G>AMANE SELECT
NM_001406836.1:c.1279G>A
NM_001406837.1:c.1105G>A
NM_001406838.1:c.835G>A
NM_181798.2:c.994G>A
NP_000209.2:p.Asp459Asn
NP_000209.2:p.Asp459Asn
NP_001393765.1:p.Asp427Asn
NP_001393766.1:p.Asp369Asn
NP_001393767.1:p.Asp279Asn
NP_861463.1:p.Asp332Asn
NP_861463.1:p.Asp332Asn
LRG_287t1:c.1375G>A
LRG_287t2:c.994G>A
LRG_287:g.148846G>A
LRG_287p1:p.Asp459Asn
LRG_287p2:p.Asp332Asn
NC_000011.9:g.2610066G>A
NM_000218.2:c.1375G>A
NM_181798.1:c.994G>A
NR_040711.2:n.1268G>A

Protein change:

D279N

Links:

dbSNP: rs747704276

NCBI 1000 Genomes Browser:

rs747704276

Molecular consequence:

NM_000218.3:c.1375G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406836.1:c.1279G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406837.1:c.1105G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406838.1:c.835G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_181798.2:c.994G>A - missense variant - [Sequence Ontology: SO:0001583]

Observations:

Condition(s)

Name:: Long QT syndrome (LQTS)
Identifiers:: MONDO: MONDO:0002442; MeSH: D008133; MedGen: C0023976

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001237245	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Dec 29, 2023)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004836431	All of Us Research Program, National Institutes of Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain Significance (Nov 2, 2023)	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

SCV001237245

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Dec 29, 2023)

germline

clinical testing

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

SCV004836431

All of Us Research Program, National Institutes of Health

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain Significance
(Nov 2, 2023)

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	5	not provided	not provided	108544	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, SCV001237245.4

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

Description

This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 459 of the KCNQ1 protein (p.Asp459Asn). This variant is present in population databases (rs747704276, gnomAD 0.06%). This variant has not been reported in the literature in individuals affected with KCNQ1-related conditions. ClinVar contains an entry for this variant (Variation ID: 628813). 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 KCNQ1 protein function with a negative predictive value of 80%. 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.

#	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 All of Us Research Program, National Institutes of Health, SCV004836431.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	5	not provided	not provided	clinical testing	PubMed (1)

Description

This missense variant replaces aspartic acid with asparagine at codon 459 of the KCNQ1 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with cardiovascular disorders in the literature. This variant has been identified in 10/280428 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	108544	not provided	not provided		5	not provided	not provided	not provided

Last Updated: Oct 26, 2024

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