rs75648145

Variant names:

• chr7-150952454-G-A
• rs75648145
• NM_000238.4:c.1528C>T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BS1 BS2

The NM_000238.4(KCNH2):​c.1528C>T​(p.Leu510Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000937 in 1,614,136 control chromosomes in the GnomAD database, including 19 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00095 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00094 (19 hom.)
• Consequence: KCNH2 NM_000238.4 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:9
• Conservation: PhyloP100: 1.26

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 Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.53).
• BP6: Variant 7-150952454-G-A is Benign according to our data. Variant chr7-150952454-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 237292.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=6, Uncertain_significance=1}. Variant chr7-150952454-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=1.26 with no splicing effect.
• BS1: Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.000936 (1368/1461834) while in subpopulation SAS AF= 0.00502 (433/86248). AF 95% confidence interval is 0.00463. There are 19 homozygotes in gnomad4_exome. There are 801 alleles in male gnomad4_exome subpopulation. Median coverage is 40. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 145 AD,Digenic gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH2	NM_000238.4	c.1528C>T	p.Leu510Leu	synonymous_variant	Exon 6 of 15	ENST00000262186.10	NP_000229.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNH2	ENST00000262186.10	c.1528C>T	p.Leu510Leu	synonymous_variant	Exon 6 of 15	1	NM_000238.4	ENSP00000262186.5

Frequencies

GnomAD3 genomes AF: 0.000953 AC: 145 AN: 152184 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000193

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00317

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00373

Gnomad FIN AF: 0.00198

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.00112

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.00147 AC: 370 AN: 251358 Hom.: 3 AF XY: 0.00169 AC XY: 230 AN XY: 135866

Gnomad AFR exome AF: 0.000246

Gnomad AMR exome AF: 0.000376

Gnomad ASJ exome AF: 0.00377

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00506

Gnomad FIN exome AF: 0.00129

Gnomad NFE exome AF: 0.00108

Gnomad OTH exome AF: 0.00147

GnomAD4 exome AF: 0.000936 AC: 1368 AN: 1461834 Hom.: 19 Cov.: 40 AF XY: 0.00110 AC XY: 801 AN XY: 727214

Gnomad4 AFR exome AF: 0.000269

Gnomad4 AMR exome AF: 0.000380

Gnomad4 ASJ exome AF: 0.00352

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00502

Gnomad4 FIN exome AF: 0.000992

Gnomad4 NFE exome AF: 0.000611

Gnomad4 OTH exome AF: 0.00113

GnomAD4 genome AF: 0.000952 AC: 145 AN: 152302 Hom.: 0 Cov.: 33 AF XY: 0.00105 AC XY: 78 AN XY: 74462

Gnomad4 AFR AF: 0.000193

Gnomad4 AMR AF: 0.000327

Gnomad4 ASJ AF: 0.00317

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00373

Gnomad4 FIN AF: 0.00198

Gnomad4 NFE AF: 0.00112

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.00102 Hom.: 0

Bravo AF: 0.000654

Asia WGS AF: 0.00173 AC: 6 AN: 3478

EpiCase AF: 0.00196

EpiControl AF: 0.00207

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:9

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:3

Apr 08, 2021

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

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 09, 2025

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 25, 2016

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:2

Mar 03, 2015

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNH2: BP4, BP7, BS2 -

Long QT syndrome Benign:2

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 05, 2024

All of Us Research Program, National Institutes of Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Long QT syndrome 2 Uncertain:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Cardiovascular phenotype Benign:1

Jul 21, 2015

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Cardiac arrhythmia Benign:1

Mar 08, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.53
CADD	Benign	2.5
DANN	Benign	0.72
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9

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

Other links and lift over

dbSNP: rs75648145; hg19: chr7-150649542;