NM_000238.4:c.3094C>T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 3P and 4B. PM1PP2BS2

The NM_000238.4(KCNH2):c.3094C>T(p.Arg1032Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000368 in 1,549,430 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1032G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000033 ( 0 hom. )

Consequence

KCNH2
NM_000238.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:1

Conservation

PhyloP100: 0.209

Publications

6 publications found

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 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

KCNH2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 29 uncertain in NM_000238.4

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.

BS2

High AC in GnomAd4 at 11 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000238.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
KCNH2	NM_000238.4	MANE Select	c.3094C>T	p.Arg1032Trp	missense	Exon 13 of 15	NP_000229.1
KCNH2	NM_001406753.1		c.2806C>T	p.Arg936Trp	missense	Exon 11 of 13	NP_001393682.1
KCNH2	NM_172057.3		c.2074C>T	p.Arg692Trp	missense	Exon 9 of 11	NP_742054.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
KCNH2	ENST00000262186.10	TSL:1 MANE Select	c.3094C>T	p.Arg1032Trp	missense	Exon 13 of 15	ENSP00000262186.5
KCNH2	ENST00000330883.9	TSL:1	c.2074C>T	p.Arg692Trp	missense	Exon 9 of 11	ENSP00000328531.4
KCNH2	ENST00000713710.1		c.3028C>T	p.Arg1010Trp	missense	Exon 13 of 15	ENSP00000519013.1

Frequencies

GnomAD3 genomes

AF:

0.0000724

AC:

AN:

152016

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000970

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

GnomAD2 exomes

AF:

0.0000955

AC:

AN:

146606

AF XY:

0.000101

show subpopulations

Gnomad AFR exome

AF:

0.000149

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000736

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000181

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000329

AC:

AN:

1397294

Hom.:

Cov.:

AF XY:

0.0000421

AC XY:

AN XY:

689216

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31766

American (AMR)

AF:

0.00

AC:

AN:

35696

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25118

East Asian (EAS)

AF:

0.000417

AC:

AN:

36012

South Asian (SAS)

AF:

0.000240

AC:

AN:

79240

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47026

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5268

European-Non Finnish (NFE)

AF:

0.00000371

AC:

AN:

1079250

Other (OTH)

AF:

0.000138

AC:

AN:

57918

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000723

AC:

AN:

152136

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74388

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

41522

American (AMR)

AF:

0.00

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000972

AC:

AN:

5142

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10610

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

67946

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.511

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000982

ExAC

AF:

0.0000303

AC:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Long QT syndrome (2)

Long QT syndrome 2 (2)

Cardiac arrhythmia (1)

Cardiovascular phenotype (1)

not specified (1)

Short QT syndrome type 1;C3150943:Long QT syndrome 2 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.097

CardioboostArm

Benign

0.000060

BayesDel_addAF

Uncertain

0.015

BayesDel_noAF

Pathogenic

0.15

CADD

Benign

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.49

Eigen

Benign

0.14

Eigen_PC

Benign

0.033

FATHMM_MKL

Benign

0.31

LIST_S2

Uncertain

0.93

M_CAP

Pathogenic

0.83

MetaRNN

Uncertain

0.54

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

1.8

PhyloP100

0.21

PrimateAI

Uncertain

0.70

PROVEAN

Uncertain

-2.5

REVEL

Pathogenic

0.66

Sift

Benign

0.18

Sift4G

Uncertain

0.028

Polyphen

1.0

Vest4

0.50

MVP

0.78

MPC

0.69

ClinPred

0.30

GERP RS

4.1

Varity_R

0.25

gMVP

0.56

Mutation Taster

=48/52

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over