Genetic Variant KCNH2:p.Val215Ala (chr7-150958331-A-G) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_000238.4(KCNH2):c.644T>C(p.Val215Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000748 in 1,337,734 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V215G) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.5e-7 ( 0 hom. )

Consequence

KCNH2
NM_000238.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.40

Publications

0 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:

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ACMG classification

Classification was made for transcript

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=0.23028228).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH2	NM_000238.4 link	c.644T>C	p.Val215Ala	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 link	c.644T>C	p.Val215Ala	missense_variant	Exon 4 of 15	1	NM_000238.4	ENSP00000262186.5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.48e-7

AC:

AN:

1337734

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

661052

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

27530

American (AMR)

AF:

0.00

AC:

AN:

29606

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23400

East Asian (EAS)

AF:

0.00

AC:

AN:

29682

South Asian (SAS)

AF:

0.00

AC:

AN:

74516

European-Finnish (FIN)

AF:

0.00

AC:

AN:

33552

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4744

European-Non Finnish (NFE)

AF:

9.44e-7

AC:

AN:

1059312

Other (OTH)

AF:

0.00

AC:

AN:

55392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

CardioboostArm

Benign

0.0011

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.050

CADD

Benign

(source)

DANN

Benign

0.94

DEOGEN2

Benign

0.35

T;T

Eigen

Benign

-0.47

Eigen_PC

Benign

-0.40

FATHMM_MKL

Benign

0.31

LIST_S2

Benign

0.64

T;T

M_CAP

Pathogenic

0.86

MetaRNN

Benign

0.23

T;T

MetaSVM

Uncertain

0.54

MutationAssessor

Benign

0.55

N;.

PhyloP100

1.4

PrimateAI

Pathogenic

0.91

PROVEAN

Benign

-0.78

N;.

REVEL

Uncertain

0.46

Sift

Benign

0.23

T;.

Sift4G

Benign

0.53

T;T

Polyphen

0.41

B;.

Vest4

0.24

MutPred

0.33

Loss of stability (P = 0.0545);.;

MVP

0.81

MPC

1.2

ClinPred

0.15

GERP RS

3.5

Varity_R

0.080

gMVP

0.37

Mutation Taster

=72/28

polymorphism

(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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over