7-150958278-C-T

Variant summary

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

The NM_000238.4(KCNH2):c.697G>A(p.Ala233Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000892 in 1,457,292 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign 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. A233S) has been classified as Likely benign.

Frequency

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

Exomes 𝑓: 0.0000092 ( 1 hom. )

Consequence

KCNH2
NM_000238.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.971

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 -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.28185385).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNH2	NM_000238.4 linkuse as main transcript	c.697G>A	p.Ala233Thr	missense_variant	4/15	ENST00000262186.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNH2	ENST00000262186.10 linkuse as main transcript	c.697G>A	p.Ala233Thr	missense_variant	4/15	1	NM_000238.4	P1	Q12809-1
KCNH2	ENST00000532957.5 linkuse as main transcript	n.920G>A		non_coding_transcript_exon_variant	4/9	2
KCNH2	ENST00000684241.1 linkuse as main transcript	n.1530G>A		non_coding_transcript_exon_variant	2/13

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151862

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:

0.00

Gnomad OTH

AF:

0.000481

GnomAD4 exome

AF:

0.00000919

AC:

AN:

1305430

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

643830

show subpopulations

Gnomad4 AFR exome

AF:

0.0000377

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:

9.61e-7

Gnomad4 OTH exome

AF:

0.000186

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151862

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74184

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:

0.00

Gnomad4 OTH

AF:

0.000481

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Long QT syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 01, 2023

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 233 of the KCNH2 protein (p.Ala233Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with KCNH2-related conditions. ClinVar contains an entry for this variant (Variation ID: 848897). 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 tolerated. 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

0.14

CardioboostArm

Benign

0.0016

BayesDel_addAF

Uncertain

0.14

BayesDel_noAF

Uncertain

-0.030

Cadd

Benign

Dann

Uncertain

0.99

DEOGEN2

Benign

0.42

T;T

Eigen

Benign

-0.64

Eigen_PC

Benign

-0.69

FATHMM_MKL

Benign

0.34

LIST_S2

Benign

0.75

T;T

M_CAP

Pathogenic

0.93

MetaRNN

Benign

0.28

T;T

MetaSVM

Uncertain

0.75

MutationAssessor

Benign

0.55

N;.

MutationTaster

Benign

0.68

N;N;N

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

-0.95

N;.

REVEL

Uncertain

0.42

Sift

Benign

0.047

D;.

Sift4G

Benign

0.35

T;T

Polyphen

0.23

B;.

Vest4

0.14

MutPred

0.10

Gain of phosphorylation at A233 (P = 0.014);.;

MVP

0.55

MPC

0.99

ClinPred

0.096

GERP RS

2.6

Varity_R

0.082

gMVP

0.31

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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