NM_000218.3(KCNQ1):c.1546G>A (p.Val516Ile) AND Long QT syndrome

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Jan 17, 2024
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:: RCV003648767.4

Allele description [Variation Report for NM_000218.3(KCNQ1):c.1546G>A (p.Val516Ile)]

NM_000218.3(KCNQ1):c.1546G>A (p.Val516Ile)

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.1546G>A (p.Val516Ile)

HGVS:

NC_000011.10:g.2768875G>A
NG_008935.1:g.328885G>A
NM_000218.3:c.1546G>AMANE SELECT
NM_001406836.1:c.1450G>A
NM_001406837.1:c.1276G>A
NM_001406838.1:c.1006G>A
NM_181798.2:c.1165G>A
NP_000209.2:p.Val516Ile
NP_000209.2:p.Val516Ile
NP_001393765.1:p.Val484Ile
NP_001393766.1:p.Val426Ile
NP_001393767.1:p.Val336Ile
NP_861463.1:p.Val389Ile
NP_861463.1:p.Val389Ile
LRG_287t1:c.1546G>A
LRG_287t2:c.1165G>A
LRG_287:g.328885G>A
LRG_287p1:p.Val516Ile
LRG_287p2:p.Val389Ile
NC_000011.9:g.2790105G>A
NM_000218.2:c.1546G>A
NM_181798.1:c.1165G>A
NR_040711.2:n.1439G>A

Protein change:

V336I

Molecular consequence:

NM_000218.3:c.1546G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406836.1:c.1450G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406837.1:c.1276G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001406838.1:c.1006G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_181798.2:c.1165G>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
SCV004511897	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 17, 2024)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004834229	All of Us Research Program, National Institutes of Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain Significance (Aug 28, 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

SCV004511897

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 17, 2024)

germline

clinical testing

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

SCV004834229

All of Us Research Program, National Institutes of Health

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain Significance
(Aug 28, 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	2	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, SCV004511897.1

#	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 valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 516 of the KCNQ1 protein (p.Val516Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with KCNQ1-related conditions. 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 expected to disrupt KCNQ1 protein function with a positive 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, SCV004834229.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	2	not provided	not provided	clinical testing	PubMed (1)

Description

This missense variant replaces valine with isoleucine at codon 516 of the KCNQ1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 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 KCNQ1-related disorders in the literature. This variant has not been identified 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		2	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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