rs370435862

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM5

The NM_000218.3(KCNQ1):c.296C>A(p.Pro99Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000563 in 1,597,760 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P99R) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

KCNQ1
NM_000218.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 4.66

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 Uncertain_significance. Variant got 2 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-2445394-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ1	NM_000218.3 link	c.296C>A	p.Pro99Gln	missense_variant	1/16	ENST00000155840.12	NP_000209.2	P51787-1Q96AI9
KCNQ1	NM_001406836.1 link	c.296C>A	p.Pro99Gln	missense_variant	1/15		NP_001393765.1
KCNQ1	NM_001406838.1 link	c.296C>A	p.Pro99Gln	missense_variant	1/11		NP_001393767.1
KCNQ1	NM_001406837.1 link	c.-67C>A		5_prime_UTR_variant	1/17		NP_001393766.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
KCNQ1	ENST00000155840.12 link	c.296C>A	p.Pro99Gln	missense_variant	1/16	1	NM_000218.3	ENSP00000155840.2	P51787-1
KCNQ1	ENST00000345015.4 link	n.73C>A		non_coding_transcript_exon_variant	1/3	1
KCNQ1	ENST00000496887.7 link	c.35C>A	p.Pro12Gln	missense_variant	2/16	5		ENSP00000434560.2	E9PPZ0
KCNQ1	ENST00000646564.2 link	c.296C>A	p.Pro99Gln	missense_variant	1/11			ENSP00000495806.2	A0A2R8YEQ9

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152084

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000895

AC:

AN:

223394

Hom.:

AF XY:

0.00

AC XY:

AN XY:

124142

show subpopulations

Gnomad AFR exome

AF:

0.0000710

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000995

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000484

AC:

AN:

1445676

Hom.:

Cov.:

AF XY:

0.00000417

AC XY:

AN XY:

719654

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

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:

0.00000450

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152084

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74288

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

AiLife Diagnostics, AiLife Diagnostics

Nov 02, 2021

- -

Long QT syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 28, 2024

This sequence change replaces proline, which is neutral and non-polar, with glutamine, which is neutral and polar, at codon 99 of the KCNQ1 protein (p.Pro99Gln). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with KCNQ1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1367809). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt KCNQ1 protein function with a positive predictive value of 95%. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

BayesDel_addAF

Uncertain

0.14

BayesDel_noAF

Pathogenic

0.15

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.43

.;T

Eigen

Benign

0.076

Eigen_PC

Benign

0.071

FATHMM_MKL

Uncertain

0.81

LIST_S2

Benign

0.63

T;T

M_CAP

Pathogenic

0.98

MetaRNN

Uncertain

0.66

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

2.0

.;M

PrimateAI

Pathogenic

0.85

PROVEAN

Benign

-2.1

N;N

REVEL

Pathogenic

0.77

Sift

Uncertain

0.025

D;D

Sift4G

Benign

0.14

T;T

Polyphen

0.64

.;P

Vest4

0.64

MutPred

0.44

.;Loss of glycosylation at P99 (P = 0.0486);

MVP

0.96

MPC

2.2

ClinPred

0.50

GERP RS

3.0

Varity_R

0.23

gMVP

0.91

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