7-150945372-C-G

Variant names:

• chr7-150945372-C-G
• rs1800852263
• NM_000238.4:c.3473G>C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000238.4(KCNH2):​c.3473G>C​(p.Gly1158Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. G1158G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNH2 NM_000238.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.02

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3396752).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH2	NM_000238.4	c.3473G>C	p.Gly1158Ala	missense_variant	Exon 15 of 15	ENST00000262186.10	NP_000229.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNH2	ENST00000262186.10	c.3473G>C	p.Gly1158Ala	missense_variant	Exon 15 of 15	1	NM_000238.4	ENSP00000262186.5
KCNH2	ENST00000330883.9	c.2453G>C	p.Gly818Ala	missense_variant	Exon 11 of 11	1		ENSP00000328531.4
KCNH2	ENST00000684241.1	n.4306G>C		non_coding_transcript_exon_variant	Exon 13 of 13

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Long QT syndrome Uncertain:1

Nov 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 939464). This variant has not been reported in the literature in individuals affected with KCNH2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 1158 of the KCNH2 protein (p.Gly1158Ala). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.38
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	.;D
Eigen	Benign	-0.080
Eigen_PC	Benign	0.062
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Pathogenic	0.47	D
MetaRNN	Benign	0.34	T;T
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Benign	1.9	.;L
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-2.4	N;D
REVEL	Uncertain	0.52
Sift	Uncertain	0.0040	D;D
Sift4G	Benign	0.065	T;D
Polyphen		0.51	P;B
Vest4		0.35
MutPred		0.26		.;Loss of glycosylation at S1159 (P = 0.166);
MVP		0.85
MPC		0.71
ClinPred		0.89	D
GERP RS		4.2
Varity_R		0.56
gMVP		0.55

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

Other links and lift over

dbSNP: rs1800852263; hg19: chr7-150642460;