rs12720457

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

1
8
10

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]

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: {Uncertain_significance=2, Benign=3, Likely_benign=14, 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
KCNQ1NM_000218.3 linkc.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 Appris UniProt
KCNQ1ENST00000155840.12 linkc.1179G>T p.Lys393Asn missense_variant Exon 9 of 16 1 NM_000218.3 ENSP00000155840.2 P51787-1
KCNQ1ENST00000335475.6 linkc.798G>T p.Lys266Asn missense_variant Exon 9 of 16 1 ENSP00000334497.5 P51787-2
KCNQ1ENST00000496887.7 linkc.822G>T p.Lys274Asn missense_variant Exon 9 of 16 5 ENSP00000434560.2 E9PPZ0
KCNQ1ENST00000646564.2 linkc.639G>T p.Lys213Asn missense_variant Exon 4 of 11 ENSP00000495806.2 A0A2R8YEQ9

Frequencies

GnomAD3 genomes
AF:
0.000591
AC:
90
AN:
152196
Hom.:
0
Cov.:
33
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.:
1
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.:
4
Cov.:
32
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:
90
AN:
152314
Hom.:
0
Cov.:
33
AF XY:
0.000671
AC XY:
50
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.:
0
Bravo
AF:
0.000646
TwinsUK
AF:
0.00
AC:
0
ALSPAC
AF:
0.000519
AC:
2
ESP6500AA
AF:
0.000454
AC:
2
ESP6500EA
AF:
0.000814
AC:
7
ExAC
AF:
0.00110
AC:
133
Asia WGS
AF:
0.000866
AC:
3
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) -

-
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

- -

Sep 14, 2023
ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories
Significance: Likely benign
Review Status: criteria provided, single submitter
Collection Method: clinical testing

- -

Jan 16, 2015
Eurofins Ntd Llc (ga)
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

- -

-
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

- -

-
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, Academic Medical Center
Significance: Likely benign
Review Status: no assertion criteria provided
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 -

Long QT syndrome Uncertain:1Benign:4
Jun 24, 2013
Biesecker Lab/Clinical Genomics Section, National Institutes of Health
Significance: Benign
Review Status: criteria provided, single submitter
Collection Method: research

- -

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

- -

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 -

Jun 01, 2014
CSER _CC_NCGL, University of Washington
Significance: Likely benign
Review Status: no assertion criteria provided
Collection Method: research

- -

Long QT syndrome 1 Benign:2
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. -

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

- -

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
T
BayesDel_noAF
Uncertain
0.010
CADD
Benign
22
DANN
Benign
0.96
DEOGEN2
Uncertain
0.76
D;.;.
Eigen
Benign
-0.60
Eigen_PC
Benign
-0.59
FATHMM_MKL
Uncertain
0.79
D
LIST_S2
Benign
0.80
T;T;T
M_CAP
Uncertain
0.27
D
MetaRNN
Benign
0.026
T;T;T
MetaSVM
Pathogenic
0.85
D
MutationAssessor
Uncertain
2.2
M;.;.
PrimateAI
Uncertain
0.65
T
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
T
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.

Other links and lift over

dbSNP: rs12720457; hg19: chr11-2608850; API