rs755781709

Positions:

chr21-34449508-C-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_000219.6(KCNE1):c.127G>A(p.Glu43Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000135 in 960,714 control chromosomes in the GnomAD database, including 3 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. E43E) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000037 ( 1 hom., cov: 13)

Exomes 𝑓: 0.000011 ( 2 hom. )

Consequence

KCNE1
NM_000219.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4O:1

Conservation

PhyloP100: 3.93

Variant links:

Genes affected

KCNE1 (HGNC:6240): (potassium voltage-gated channel subfamily E regulatory subunit 1) The product of this gene belongs to the potassium channel KCNE family. Potassium ion channels are essential to many cellular functions and show a high degree of diversity, varying in their electrophysiologic and pharmacologic properties. This gene encodes a transmembrane protein known to associate with the product of the KVLQT1 gene to form the delayed rectifier potassium channel. Mutation in this gene are associated with both Jervell and Lange-Nielsen and Romano-Ward forms of long-QT syndrome. Alternatively spliced transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

KCNE1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High Homozygotes in GnomAdExome4 at 2 AD,AR,Digenic gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNE1	NM_000219.6 linkuse as main transcript	c.127G>A	p.Glu43Lys	missense_variant	4/4	ENST00000399286.3	NP_000210.2	P15382C7S316Q6FHJ6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNE1	ENST00000399286.3 linkuse as main transcript	c.127G>A	p.Glu43Lys	missense_variant	4/4	1	NM_000219.6	ENSP00000382226.2		P15382

Frequencies

GnomAD3 genomes

AF:

0.0000366

AC:

AN:

81954

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000104

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000110

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251436

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135914

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000202

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000114

AC:

AN:

878760

Hom.:

Cov.:

AF XY:

0.0000114

AC XY:

AN XY:

438660

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000194

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:

0.00000605

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000366

AC:

AN:

81954

Hom.:

Cov.:

AF XY:

0.0000499

AC XY:

AN XY:

40046

show subpopulations

Gnomad4 AFR

AF:

0.000104

Gnomad4 AMR

AF:

0.000110

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000830

Hom.:

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Aug 16, 2017

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Mar 26, 2020

- -

Long QT syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 10, 2023

ClinVar contains an entry for this variant (Variation ID: 409232). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on KCNE1 protein function. 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. This variant has not been reported in the literature in individuals affected with KCNE1-related conditions. This variant is present in population databases (rs755781709, gnomAD 0.02%). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 43 of the KCNE1 protein (p.Glu43Lys). -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 17, 2024

The p.E43K variant (also known as c.127G>A), located in coding exon 1 of the KCNE1 gene, results from a G to A substitution at nucleotide position 127. The glutamic acid at codon 43 is replaced by lysine, an amino acid with similar properties. This variant has been reported in an individual in an elevated QTc interval cohort, but clinical details were limited (Sarquella-Brugada G et al. Front Pediatr, 2021 Jul;9:704580). This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Long QT syndrome 5

Other:1

not provided, no classification provided

in vitro

Roden Lab, Vanderbilt University Medical Center

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Uncertain

0.060

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.85

D;D;D;D;D;D;D;D

Eigen

Uncertain

0.42

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.83

.;.;T;.;.;.;.;.

M_CAP

Uncertain

0.21

MetaRNN

Uncertain

0.66

D;D;D;D;D;D;D;D

MetaSVM

Pathogenic

0.94

MutationAssessor

Uncertain

2.5

M;M;M;M;M;M;M;M

PrimateAI

Benign

0.38

PROVEAN

Benign

-2.2

N;.;.;N;N;N;N;N

REVEL

Pathogenic

0.68

Sift

Uncertain

0.028

D;.;.;D;D;D;D;D

Sift4G

Benign

0.088

T;T;T;T;T;T;T;T

Polyphen

0.87

P;P;P;P;P;P;P;P

Vest4

0.34

MutPred

0.70

Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);Gain of MoRF binding (P = 0.0115);

MVP

0.95

MPC

0.31

ClinPred

0.48

GERP RS

5.3

Varity_R

0.24

gMVP

0.76

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