chr7-150947617-T-C

Position:

chr7-150947617-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PP3BS2_Supporting

The NM_000238.4(KCNH2):c.2954A>G(p.Asn985Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000372 in 1,612,336 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N985I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

KCNH2
NM_000238.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3O:1

Conservation

PhyloP100: 3.22

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 Uncertain_significance. Variant got 0 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.809

BS2

High AC in GnomAdExome4 at 5 AD,Digenic gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNH2	NM_000238.4 linkuse as main transcript	c.2954A>G	p.Asn985Ser	missense_variant	12/15	ENST00000262186.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNH2	ENST00000262186.10 linkuse as main transcript	c.2954A>G	p.Asn985Ser	missense_variant	12/15	1	NM_000238.4	P1	Q12809-1
KCNH2	ENST00000330883.9 linkuse as main transcript	c.1934A>G	p.Asn645Ser	missense_variant	8/11	1			Q12809-2
KCNH2	ENST00000684241.1 linkuse as main transcript	n.3787A>G		non_coding_transcript_exon_variant	10/13

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151840

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000407

AC:

AN:

245720

Hom.:

AF XY:

0.00000748

AC XY:

AN XY:

133676

show subpopulations

Gnomad AFR exome

AF:

0.00

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:

0.00000905

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1460496

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726532

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:

0.00000450

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000659

AC:

AN:

151840

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74148

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000312

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Long QT syndrome

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 16, 2021	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. Experimental studies have shown that this missense change results in a protein with most, but not all function retained (PMID: 16043162). This variant has been reported in an individual affected with Brugada syndrome (PMID: 16043162). ClinVar contains an entry for this variant (Variation ID: 67456). This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with serine at codon 985 of the KCNH2 protein (p.Asn985Ser). The asparagine residue is moderately conserved and there is a small physicochemical difference between asparagine and serine. -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Sep 09, 2023	Variant of Uncertain Significance due to insufficient evidence: This missense variant replaces asparagine with serine at codon 985 of the KCNH2 protein. Computational prediction tools and conservation analyses are inconclusive regarding the impact of this variant on the protein function. Computational splicing tools suggest that this variant may not impact RNA splicing. An experimental study has shown that the variant does not significantly biophysical properties of the potassium channels, except for voltage-dependence of inactivation and current densities (PMID: 16043162). Clinical relevance of this observation is not clear. This variant has been reported in an individual affected with Brugada syndrome (PMID: 16043162). This variant has also been identified in 2/277014 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Available evidence is insufficient to determine the role of this variant in disease conclusively. -

Cardiac arrhythmia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 16, 2019

Variant of Uncertain Significance due to insufficient evidence: This missense variant replaces asparagine with serine at codon 985 of the KCNH2 protein. Computational prediction tools and conservation analyses are inconclusive regarding the impact of this variant on the protein function. Computational splicing tools suggest that this variant may not impact RNA splicing. An experimental study has shown that the variant does not significantly biophysical properties of the potassium channels, except for voltage-dependence of inactivation and current densities (PMID: 16043162). Clinical relevance of this observation is not clear. This variant has been reported in an individual affected with Brugada syndrome (PMID: 16043162). This variant has also been identified in 2/277014 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Available evidence is insufficient to determine the role of this variant in disease conclusively. -

not provided

Other: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:16043162). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.070

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.37

.;T

Eigen

Benign

-0.023

Eigen_PC

Benign

-0.037

FATHMM_MKL

Benign

0.72

LIST_S2

Uncertain

0.90

D;D

M_CAP

Pathogenic

0.74

MetaRNN

Pathogenic

0.81

D;D

MetaSVM

Uncertain

0.68

MutationAssessor

Benign

1.8

.;L

MutationTaster

Benign

0.68

D;D;D

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-1.2

N;N

REVEL

Uncertain

0.46

Sift

Benign

0.23

T;T

Sift4G

Benign

0.59

T;T

Polyphen

0.96

D;P

Vest4

0.61

MutPred

0.14

.;Gain of phosphorylation at N985 (P = 0.0343);

MVP

0.80

MPC

0.55

ClinPred

0.64

GERP RS

3.7

Varity_R

0.22

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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