rs34150427

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000218.3(KCNQ1):c.1942G>A(p.Val648Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00125 in 1,576,322 control chromosomes in the GnomAD database, including 16 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V648L) has been classified as Benign.

Frequency

Genomes: 𝑓 0.0067 ( 6 hom., cov: 33)

Exomes 𝑓: 0.00067 ( 10 hom. )

Consequence

KCNQ1
NM_000218.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:13O:1

Conservation

PhyloP100: -0.554

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:

KCNQ1-AS1 (HGNC:42790): (KCNQ1 antisense RNA 1)

KCNQ1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0043562353).

BP6

Variant 11-2847914-G-A is Benign according to our data. Variant chr11-2847914-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 36438.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-2847914-G-A is described in Lovd as [Benign]. Variant chr11-2847914-G-A is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00673 (1025/152246) while in subpopulation AFR AF= 0.0233 (969/41548). AF 95% confidence interval is 0.0221. There are 6 homozygotes in gnomad4. There are 477 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd at 6 AD,AR,Digenic gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNQ1	NM_000218.3 linkuse as main transcript	c.1942G>A	p.Val648Ile	missense_variant	16/16	ENST00000155840.12
KCNQ1-AS1	NR_130721.1 linkuse as main transcript	n.778-7472C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNQ1	ENST00000155840.12 linkuse as main transcript	c.1942G>A	p.Val648Ile	missense_variant	16/16	1	NM_000218.3	P1	P51787-1
KCNQ1-AS1	ENST00000440887.2 linkuse as main transcript	n.777-7472C>T		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes

AF:

0.00674

AC:

1025

AN:

152128

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0234

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00268

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00527

GnomAD3 exomes

AF:

0.00145

AC:

269

AN:

185112

Hom.:

AF XY:

0.00122

AC XY:

122

AN XY:

100136

show subpopulations

Gnomad AFR exome

AF:

0.0228

Gnomad AMR exome

AF:

0.000691

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000798

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000652

Gnomad OTH exome

AF:

0.000414

GnomAD4 exome

AF:

0.000667

AC:

950

AN:

1424076

Hom.:

Cov.:

AF XY:

0.000579

AC XY:

408

AN XY:

704970

show subpopulations

Gnomad4 AFR exome

AF:

0.0235

Gnomad4 AMR exome

AF:

0.000893

Gnomad4 ASJ exome

AF:

0.0000394

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000122

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000366

Gnomad4 OTH exome

AF:

0.00156

GnomAD4 genome

AF:

0.00673

AC:

1025

AN:

152246

Hom.:

Cov.:

AF XY:

0.00641

AC XY:

477

AN XY:

74454

show subpopulations

Gnomad4 AFR

AF:

0.0233

Gnomad4 AMR

AF:

0.00268

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00521

Alfa

AF:

0.00306

Hom.:

Bravo

AF:

0.00756

ESP6500AA

AF:

0.0177

AC:

ESP6500EA

AF:

0.000237

AC:

ExAC

AF:

0.00147

AC:

175

Asia WGS

AF:

0.00173

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:13Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2Other:1

not provided, no classification provided	literature only	Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust	-	This variant has been reported in the following publications (PMID:14661677;PMID:19841300). -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 11, 2020	This variant is associated with the following publications: (PMID: 15913580) -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Aug 23, 2020	- -

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 08, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	May 07, 2012	Val648Ile in Exon 16 of KCNQ1: This variant is not expected to have clinical sig nificance because it has been identified in 1.7% (60/3612) of African American c hromosomes from a broad population by the NHLBI Exome Sequencing Project (http:/ /evs.gs.washington.edu/EVS; dbSNP rs34150427). -

Cardiac arrhythmia

Benign:2

Benign, no assertion criteria provided	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 18, 2013	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 19, 2018	- -

Long QT syndrome 1

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Atrial fibrillation, familial, 3

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Jervell and Lange-Nielsen syndrome 1

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

Short QT syndrome type 2

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

Congenital long QT syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Long QT syndrome

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 29, 2024

- -

Cardiovascular phenotype

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 02, 2016

This alteration is classified as 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.071

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.17

Cadd

Benign

0.083

Dann

Benign

0.80

DEOGEN2

Benign

0.28

T;.;.

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.0058

LIST_S2

Benign

0.38

T;T;T

MetaRNN

Benign

0.0044

T;T;T

MetaSVM

Uncertain

0.27

MutationAssessor

Benign

-0.81

N;.;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.43

PROVEAN

Benign

0.0

N;N;.

REVEL

Uncertain

0.34

Sift

Benign

0.89

T;T;.

Sift4G

Benign

0.52

T;T;.

Polyphen

0.0010

B;.;.

Vest4

0.030

MVP

0.76

MPC

0.30

ClinPred

0.0050

GERP RS

-1.3

Varity_R

0.020

gMVP

0.36

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