chr7-150948483-G-A

Position:

chr7-150948483-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The ENST00000262186.10(KCNH2):c.2653C>T(p.Arg885Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0001 in 1,612,162 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R885H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

KCNH2
ENST00000262186.10 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:3O:1

Conservation

PhyloP100: 4.89

Variant links:

Genes affected

KCNH2 (HGNC:6251): (potassium voltage-gated channel subfamily H member 2) This gene encodes a component of a voltage-activated potassium channel found in cardiac muscle, nerve cells, and microglia. Four copies of this protein interact with one copy of the KCNE2 protein to form a functional potassium channel. Mutations in this gene can cause long QT syndrome type 2 (LQT2). Transcript variants encoding distinct isoforms have been identified. [provided by RefSeq, May 2022]

KCNH2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.818

BS2

High AC in GnomAd4 at 16 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNH2	NM_000238.4 linkuse as main transcript	c.2653C>T	p.Arg885Cys	missense_variant	11/15	ENST00000262186.10	NP_000229.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNH2	ENST00000262186.10 linkuse as main transcript	c.2653C>T	p.Arg885Cys	missense_variant	11/15	1	NM_000238.4	ENSP00000262186	P1	Q12809-1
KCNH2	ENST00000330883.9 linkuse as main transcript	c.1633C>T	p.Arg545Cys	missense_variant	7/11	1		ENSP00000328531		Q12809-2
KCNH2	ENST00000684241.1 linkuse as main transcript	n.3486C>T		non_coding_transcript_exon_variant	9/13

Frequencies

GnomAD3 genomes

AF:

0.000106

AC:

AN:

151578

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000243

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000197

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000416

Gnomad FIN

AF:

0.000382

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000883

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000224

AC:

AN:

249574

Hom.:

AF XY:

0.000266

AC XY:

AN XY:

135168

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000229

Gnomad FIN exome

AF:

0.000435

Gnomad NFE exome

AF:

0.000292

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.000100

AC:

146

AN:

1460584

Hom.:

Cov.:

AF XY:

0.000109

AC XY:

AN XY:

726744

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.000209

Gnomad4 FIN exome

AF:

0.000518

Gnomad4 NFE exome

AF:

0.0000612

Gnomad4 OTH exome

AF:

0.000331

GnomAD4 genome

AF:

0.000106

AC:

AN:

151578

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

73992

show subpopulations

Gnomad4 AFR

AF:

0.0000243

Gnomad4 AMR

AF:

0.000197

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000416

Gnomad4 FIN

AF:

0.000382

Gnomad4 NFE

AF:

0.0000883

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000121

Hom.:

Bravo

AF:

0.0000869

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000288

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:3Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Long QT syndrome

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 02, 2024	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 885 of the KCNH2 protein (p.Arg885Cys). This variant is present in population databases (rs143512106, gnomAD 0.03%). This missense change has been observed in individual(s) with long QT syndrome (PMID: 17210839, 18752142, 19716085, 27920829, 30369311). ClinVar contains an entry for this variant (Variation ID: 67422). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Experimental studies have shown that this missense change does not substantially affect KCNH2 function (PMID: 18222468). 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. -
Uncertain significance, no assertion criteria provided	research	CSER _CC_NCGL, University of Washington	Jun 01, 2014	- -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Dec 13, 2023	This missense variant replaces arginine with cysteine at codon 885 of the KCNH2 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). A functional study has shown that this variant does not change the biophysical properties of the protein (PMID: 18222468). This variant has been reported in several individuals affected with or suspected of having long QT syndrome (PMID: 18752142, 19716085, 27920829, 30369311), and in another individual affected with sudden infant death syndrome (PMID: 17210839). One of these individuals also carried a pathogenic splicing variant in the KCNH2 gene that could explain the observed phenotype (PMID: 27920829). This variant has also been identified in 58/280856 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Congenital long QT syndrome

Benign:1Other:1

Benign, criteria provided, single submitter	clinical testing	Petrovsky National Research Centre of Surgery, The Federal Agency for Scientific Organizations	Aug 08, 2023	Heterozygous variant NM_000238:c.2653C>T (p.Arg885Cys) in the KCNH2 gene was found on WES data in female proband (13 y.o., Caucasian) with Long QT syndrome. An additional variant NM_003098:c.787G>T (p.Ala263Ser) in the SNTA1 gene was found in this proband. This variant is in The Genome Aggregation Database (gnomAD) v2.1.1 with total MAF 0.0002065 (Date of access 08-08-2023). Clinvar contains entry for this variant (Variation ID: 67422). This variant has been reported in over a dozen studies in patients with variable phenotypes. Experimental data showed the variant exhibited biophysical properties indistinguishable from WT-HERG (PMID: 18752142). Most in silico predictors show pathogenic result of the protein change (varsome.com). In accordance with ACMG(2015) criteria and enhanced rare variant interpretation in inherited arrhythmias (PMID: 32893267) this variant is classified as Benign with following criteria selected: BS1, BS3, PM1, PP2, PP3. -
not provided, no classification provided	literature only	Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust	-	This variant has been reported as associated with Long QT syndrome in the following publications (PMID:16244680;PMID:17210839;PMID:18752142;PMID:19716085;PMID:22378279). This is a literature report, and does not necessarily reflect the clinical interpretation of the Imperial College / Royal Brompton Cardiovascular Genetics laboratory. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jul 30, 2018

Variant summary: KCNH2 c.2653C>T (p.Arg885Cys) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0002 in 275594 control chromosomes. The observed variant frequency is approximately 2 fold of the estimated maximal expected allele frequency for a pathogenic variant in KCNH2 causing Arrhythmia phenotype (0.0001), suggesting the variant may be benign. However, this observation must be interpreted cautiously due to the presence of potenially affected individuals in the ExAC and gnomAD databases. c.2653C>T has been reported in the literature in individuals affected with Arrhythmia without strong evidence for or against pathogenicity. However, one publication reported a co-occurrence with a pathogenic KCNH2 variant (c.1557+1G>C), providing supporting evidence for a benign role (Burns_2016). One publication reports experimental evidence suggesting there is no functional effect of the variant, though the data was not presented for review (Rhodes_2008). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as VUS-possibly benign until additional information becomes available. -

Short QT syndrome type 1;C3150943:Long QT syndrome 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 29, 2021

- -

Cardiac arrhythmia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 20, 2023

This missense variant replaces arginine with cysteine at codon 885 of the KCNH2 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). A functional study has shown that this variant does not change the biophysical properties of the protein (PMID: 18222468). This variant has been reported in several individuals affected with or suspected of having long QT syndrome (PMID: 18752142, 19716085, 27920829, 30369311), and in another individual affected with sudden infant death syndrome (PMID: 17210839). One of these individuals also carried a pathogenic splicing variant in the KCNH2 gene that could explain the observed phenotype (PMID: 27920829). This variant has also been identified in 58/280856 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Dec 01, 2023

KCNH2: BP2, BS3:Supporting -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 27, 2022

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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.31

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.40

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.86

.;D

Eigen

Benign

-0.014

Eigen_PC

Benign

-0.029

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.93

D;D

M_CAP

Pathogenic

0.97

MetaRNN

Pathogenic

0.82

D;D

MetaSVM

Pathogenic

0.96

MutationAssessor

Benign

1.8

.;L

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.69

PROVEAN

Uncertain

-3.6

D;D

REVEL

Pathogenic

0.79

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.024

D;D

Polyphen

0.016

B;D

Vest4

0.72

MVP

1.0

MPC

0.79

ClinPred

0.34

GERP RS

3.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.16

gMVP

0.88

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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