7-150958268-C-T

Variant names:

• chr7-150958268-C-T
• rs199472870
• NM_000238.4:c.707G>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000238.4(KCNH2):​c.707G>A​(p.Gly236Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000772 in 1,295,516 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G236V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.7e-7 (0 hom.)
• Consequence: KCNH2 NM_000238.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.770
• Publications: 3 publications found

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 Gene-Disease associations (from GenCC):

• long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• short QT syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• short QT syndrome type 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Brugada syndrome

  Inheritance: AD Classification: MODERATE, NO_KNOWN Submitted by: ClinGen, Genomics England PanelApp

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 158 curated pathogenic missense variants (we use a threshold of 10). The gene has 38 curated benign missense variants. Gene score misZ: 3.3724 (above the threshold of 3.09). Trascript score misZ: 2.4846 (below the threshold of 3.09). GenCC associations: The gene is linked to long QT syndrome 2, Brugada syndrome, short QT syndrome type 1, short QT syndrome, long QT syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.26022023).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH2	NM_000238.4	c.707G>A	p.Gly236Asp	missense_variant	Exon 4 of 15	ENST00000262186.10	NP_000229.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNH2	ENST00000262186.10	c.707G>A	p.Gly236Asp	missense_variant	Exon 4 of 15	1	NM_000238.4	ENSP00000262186.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.72e-7 AC: 1 AN: 1295516 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 638346

African (AFR) AF: 0.00 AC: 0 AN: 26308

American (AMR) AF: 0.00 AC: 0 AN: 24536

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22234

East Asian (EAS) AF: 0.00 AC: 0 AN: 27730

South Asian (SAS) AF: 0.00 AC: 0 AN: 69184

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 32388

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4072

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1035666

Other (OTH) AF: 0.0000187 AC: 1 AN: 53398

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

Feb 06, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with KCNH2-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change replaces glycine with aspartic acid at codon 236 of the KCNH2 protein (p.Gly236Asp). The glycine residue is weakly conserved and there is a moderate physicochemical difference between glycine and aspartic acid. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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	0.13
CardioboostArm	Benign	0.00048
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	16
DANN	Benign	0.90
DEOGEN2	Benign	0.37	T;T
Eigen	Benign	-0.97
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.32	N
LIST_S2	Benign	0.65	T;T
M_CAP	Pathogenic	0.98	D
MetaRNN	Benign	0.26	T;T
MetaSVM	Uncertain	0.13	D
MutationAssessor	Benign	0.81	L;.
PhyloP100		0.77
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-1.4	N;D
REVEL	Uncertain	0.45
Sift	Benign	0.56	T;T
Sift4G	Benign	0.54	T;T
Polyphen		0.014	B;.
Vest4		0.45
MutPred		0.11		Loss of glycosylation at P237 (P = 0.0817);.;
MVP		0.60
MPC		1.3
ClinPred		0.11	T
GERP RS		-1.1
Varity_R		0.15
gMVP		0.51
Mutation Taster		=89/11	polymorphism

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

Other links and lift over

dbSNP: rs199472870; hg19: chr7-150655356;