rs199473443

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The NM_000218.3(KCNQ1):c.19C>T(p.Pro7Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000332 in 1,100,404 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00036 ( 0 hom. )

Consequence

KCNQ1
NM_000218.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:1O:1

Conservation

PhyloP100: 0.235

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 -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.3163181).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ1	NM_000218.3 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 16	ENST00000155840.12	NP_000209.2	P51787-1Q96AI9
KCNQ1	NM_001406836.1 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 15		NP_001393765.1
KCNQ1	NM_001406838.1 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 11		NP_001393767.1
KCNQ1	NM_001406837.1 link	c.-344C>T		5_prime_UTR_variant	Exon 1 of 17		NP_001393766.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNQ1	ENST00000155840.12 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 16	1	NM_000218.3	ENSP00000155840.2	P51787-1
KCNQ1	ENST00000646564.2 link	c.19C>T	p.Pro7Ser	missense_variant	Exon 1 of 11			ENSP00000495806.2	A0A2R8YEQ9
KCNQ1	ENST00000496887.7 link	c.24-266C>T		intron_variant	Intron 1 of 15	5		ENSP00000434560.2	E9PPZ0

Frequencies

GnomAD3 genomes

AF:

0.000182

AC:

AN:

148034

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000392

Gnomad OTH

AF:

0.000489

GnomAD4 exome

AF:

0.000356

AC:

339

AN:

952262

Hom.:

Cov.:

AF XY:

0.000360

AC XY:

162

AN XY:

449890

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000383

Gnomad4 OTH exome

AF:

0.000560

GnomAD4 genome

AF:

0.000176

AC:

AN:

148142

Hom.:

Cov.:

AF XY:

0.000125

AC XY:

AN XY:

72198

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000377

Gnomad4 OTH

AF:

0.000484

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000136

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Oct 13, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Variant not reported in ExAC but has been reported in 1 affected individual (LQTS). In ClinVar without clinical assertion - 2 submitters (no stars). -

Oct 07, 2024

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: KCNQ1 c.19C>T (p.Pro7Ser) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The frequency data for this variant in gnomAD is considered unreliable, as metrics indicate poor data quality at this position. c.19C>T has been reported in the literature in heterozygous individuals affected with autosomal dominant Long QT syndrome 1 (Johnson_2008, Thompson_2018, Yoneda_2021). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 18452873, 29790872, 34495297). ClinVar contains an entry for this variant (Variation ID: 53028). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

not provided

Uncertain:2

Aug 25, 2021

AiLife Diagnostics, AiLife Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNQ1: PS4:Moderate, PM2:Supporting, PP2, PP3 -

Long QT syndrome 1

Uncertain:1

Sep 02, 2021

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Beckwith-Wiedemann syndrome;C1837014:Atrial fibrillation, familial, 3;C1865019:Short QT syndrome type 2;C4551509:Jervell and Lange-Nielsen syndrome 1;C4551647:Long QT syndrome 1

Uncertain:1

Nov 09, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Uncertain:1

Nov 16, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.19C>T (p.P7S) alteration is located in exon 1 (coding exon 1) of the KCNQ1 gene. This alteration results from a C to T substitution at nucleotide position 19, causing the proline (P) at amino acid position 7 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Long QT syndrome

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Congenital long QT syndrome

Other:1

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 as associated with Long QT syndrome in the following publications (PMID:18452873;PMID:19716085;PMID:19862833). This is a literature report, and does not necessarily reflect the clinical interpretation of the Imperial College / Royal Brompton Cardiovascular Genetics laboratory. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.067

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.0

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.40

Eigen

Benign

-0.54

Eigen_PC

Benign

-0.49

FATHMM_MKL

Benign

0.052

LIST_S2

Benign

0.57

M_CAP

Pathogenic

0.99

MetaRNN

Benign

0.32

MetaSVM

Uncertain

0.69

MutationAssessor

Benign

1.4

PrimateAI

Pathogenic

0.85

PROVEAN

Benign

-0.76

REVEL

Uncertain

0.50

Sift

Uncertain

0.014

Sift4G

Pathogenic

0.0

Polyphen

0.047

Vest4

0.16

MutPred

0.70

Gain of phosphorylation at P7 (P = 0.0022);

MVP

0.91

MPC

1.2

ClinPred

0.13

GERP RS

2.7

Varity_R

0.069

gMVP

0.47

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