NM_000218.3:c.1179G>T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 6P and 9B. PS1PM5BP4_StrongBP6BS2

The NM_000218.3(KCNQ1):c.1179G>T(p.Lys393Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000779 in 1,613,974 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in Lovd. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K393M) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.00059 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00080 ( 4 hom. )

Consequence

KCNQ1
NM_000218.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:22O:1

Conservation

PhyloP100: 0.568

Variant links:

Genes affected

KCNQ1 (HGNC:6294): (potassium voltage-gated channel subfamily Q member 1) This gene encodes a voltage-gated potassium channel required for repolarization phase of the cardiac action potential. This protein can form heteromultimers with two other potassium channel proteins, KCNE1 and KCNE3. Mutations in this gene are associated with hereditary long QT syndrome 1 (also known as Romano-Ward syndrome), Jervell and Lange-Nielsen syndrome, and familial atrial fibrillation. This gene exhibits tissue-specific imprinting, with preferential expression from the maternal allele in some tissues, and biallelic expression in others. This gene is located in a region of chromosome 11 amongst other imprinted genes that are associated with Beckwith-Wiedemann syndrome (BWS), and itself has been shown to be disrupted by chromosomal rearrangements in patients with BWS. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2011]

KCNQ1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PS1

Transcript NM_000218.3 (KCNQ1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-2587619-A-T is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.026480198).

BP6

Variant 11-2587620-G-T is Benign according to our data. Variant chr11-2587620-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 67020.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=14, Benign=3, Uncertain_significance=2, not_provided=1}. Variant chr11-2587620-G-T is described in Lovd as [Benign]. Variant chr11-2587620-G-T is described in Lovd as [Likely_benign].

BS2

High Homozygotes in GnomAdExome4 at 4 AD,AR,Digenic gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3 link	c.1179G>T	p.Lys393Asn	missense_variant	Exon 9 of 16	ENST00000155840.12	NP_000209.2	P51787-1Q96AI9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNQ1	ENST00000155840.12 link	c.1179G>T	p.Lys393Asn	missense_variant	Exon 9 of 16	1	NM_000218.3	ENSP00000155840.2	P51787-1
KCNQ1	ENST00000335475.6 link	c.798G>T	p.Lys266Asn	missense_variant	Exon 9 of 16	1		ENSP00000334497.5	P51787-2
KCNQ1	ENST00000496887.7 link	c.822G>T	p.Lys274Asn	missense_variant	Exon 9 of 16	5		ENSP00000434560.2	E9PPZ0
KCNQ1	ENST00000646564.2 link	c.639G>T	p.Lys213Asn	missense_variant	Exon 4 of 11			ENSP00000495806.2	A0A2R8YEQ9

Frequencies

GnomAD3 genomes

AF:

0.000591

AC:

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000916

Gnomad ASJ

AF:

0.00202

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00145

Gnomad FIN

AF:

0.000565

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000691

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.00109

AC:

275

AN:

251370

Hom.:

AF XY:

0.00126

AC XY:

171

AN XY:

135876

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.00133

Gnomad ASJ exome

AF:

0.00248

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00167

Gnomad FIN exome

AF:

0.000601

Gnomad NFE exome

AF:

0.00112

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.000798

AC:

1167

AN:

1461660

Hom.:

Cov.:

AF XY:

0.000855

AC XY:

622

AN XY:

727146

show subpopulations

Gnomad4 AFR exome

AF:

0.000657

Gnomad4 AMR exome

AF:

0.00148

Gnomad4 ASJ exome

AF:

0.00253

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00170

Gnomad4 FIN exome

AF:

0.000620

Gnomad4 NFE exome

AF:

0.000644

Gnomad4 OTH exome

AF:

0.00118

GnomAD4 genome

AF:

0.000591

AC:

AN:

152314

Hom.:

Cov.:

AF XY:

0.000671

AC XY:

AN XY:

74468

show subpopulations

Gnomad4 AFR

AF:

0.000144

Gnomad4 AMR

AF:

0.000915

Gnomad4 ASJ

AF:

0.00202

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00145

Gnomad4 FIN

AF:

0.000565

Gnomad4 NFE

AF:

0.000691

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000956

Hom.:

Bravo

AF:

0.000646

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000814

AC:

ExAC

AF:

0.00110

AC:

133

Asia WGS

AF:

0.000866

AC:

AN:

3478

EpiCase

AF:

0.00147

EpiControl

AF:

0.00213

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:22Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:7Other:1

Mar 25, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 19862833, 25637381, 22949429, 23861362, 31337358, 16556865, 24400285, 23571586, 14661677, 17161064, 14678125, 17210839, 17470695, 19841300, 23396983, 24055113, 25854863, 28074886, 22677073, 30020974, 26970180, 29431662) -

Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

This variant has been reported in the following publications (PMID:14661677;PMID:14678125;PMID:17161064;PMID:17210839;PMID:17470695;PMID:19841300;PMID:19862833). -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Sep 14, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 16, 2015

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNQ1: BS2 -

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Long QT syndrome

Uncertain:1Benign:4

Sep 27, 2024

All of Us Research Program, National Institutes of Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: research

- -

Jun 01, 2014

CSER _CC_NCGL, University of Washington

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: research

- -

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 08, 2024

Dept of Medical Biology, Uskudar University

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

Criteria: BS1 -

Long QT syndrome 1

Benign:2

Jan 01, 2019

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

not specified

Benign:2

Jul 20, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Lys393Asn in exon 9 of KCNQ1: This variant is not expected to have clinical si gnificance because it has been reported in the literature in both control and cl inical cohorts (Ackerman 2003, Moss 2007, Guidicessi 2012, Crotti 2013). In addi tion, this variant has been identified in 0.3% (27/10152) of Ashkenazi Jewish ch romosomes and 0.2% (52/30782) of South Asian chromosomes including 1 homozygote by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; db SNP rs12720457). Studies have shown that the p.Lys393Asn variant does not impact protein function (Shamgar 2006). Furthermore, the lysine (Lys) at amino acid po sition 393 is not conserved across species, including mammals. Of note, cat has an asparagine (Asn) at this position despite high nearby amino acid conservation . Additional computational analyses do not suggest a high likelihood of impact t o the protein. In summary, this variant is classified as likely benign based on the available data. -

Oct 16, 2017

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The KCNQ1 c.1179G>T (p.Lys393Asn) variant involves the alteration of a non-conserved nucleotide. 3/4 in silico tools predict a damaging outcome for this variant (SNPsandGO not captured due to low reliability index). This variant was found in 292/277174 control chromosomes, including 1 homozygous individual, predominantly observed in the Ashkenazi Jewish subpopulation at a frequency of 0.00266 (27/10152). This frequency is about 27 times the estimated maximal expected allele frequency of a pathogenic KCNQ1 variant (0.0001), suggesting this is likely a benign polymorphism found primarily in the populations of Ashkenazi Jewish origin. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as likely benign. Taken together, this variant is classified as likely benign. -

Atrial fibrillation, familial, 3

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Jervell and Lange-Nielsen syndrome 1

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Cardiomyopathy

Benign:1

Aug 30, 2017

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Short QT syndrome type 2

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Congenital long QT syndrome

Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Sep 22, 2018

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Cardiac arrhythmia

Benign:1

Mar 16, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Uncertain

0.010

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Uncertain

0.76

D;.;.

Eigen

Benign

-0.60

Eigen_PC

Benign

-0.59

FATHMM_MKL

Uncertain

0.79

LIST_S2

Benign

0.80

T;T;T

M_CAP

Uncertain

0.27

MetaRNN

Benign

0.026

T;T;T

MetaSVM

Pathogenic

0.85

MutationAssessor

Uncertain

2.2

M;.;.

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-2.3

N;.;N

REVEL

Uncertain

0.55

Sift

Benign

0.17

T;.;T

Sift4G

Benign

0.19

T;.;T

Polyphen

0.77

P;.;B

Vest4

0.81

MutPred

0.82

Loss of methylation at K393 (P = 0.0144);.;.;

MVP

0.90

MPC

0.44

ClinPred

0.018

GERP RS

0.59

Varity_R

0.41

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over