chr14-62950499-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_139318.5(KCNH5):c.1003G>A(p.Ala335Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000572 in 1,609,718 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000040 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000059 ( 0 hom. )

Consequence

KCNH5
NM_139318.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 7.90

Variant links:

Genes affected

KCNH5 (HGNC:6254): (potassium voltage-gated channel subfamily H member 5) This gene encodes a member of voltage-gated potassium channels. Members of this family have diverse functions, including regulating neurotransmitter and hormone release, cardiac function, and cell volume. This protein is an outward-rectifying, noninactivating channel. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

KCNH5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.758

BS2

High AC in GnomAd4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNH5	NM_139318.5 link	c.1003G>A	p.Ala335Thr	missense_variant	Exon 7 of 11	ENST00000322893.12	NP_647479.2	Q8NCM2-1
KCNH5	NM_172375.3 link	c.1003G>A	p.Ala335Thr	missense_variant	Exon 7 of 10		NP_758963.1	Q8NCM2-2
KCNH5	XM_047431275.1 link	c.1003G>A	p.Ala335Thr	missense_variant	Exon 7 of 10		XP_047287231.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNH5	ENST00000322893.12 link	c.1003G>A	p.Ala335Thr	missense_variant	Exon 7 of 11	1	NM_139318.5	ENSP00000321427.7	Q8NCM2-1
KCNH5	ENST00000420622.6 link	c.1003G>A	p.Ala335Thr	missense_variant	Exon 7 of 10	1		ENSP00000395439.2	Q8NCM2-2
KCNH5	ENST00000394964.3 link	n.1168G>A		non_coding_transcript_exon_variant	Exon 7 of 7	1
KCNH5	ENST00000394968.2 link	c.829G>A	p.Ala277Thr	missense_variant	Exon 7 of 11	2		ENSP00000378419.1	Q8NCM2-3

Frequencies

GnomAD3 genomes

AF:

0.0000395

AC:

AN:

151798

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000883

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000202

AC:

AN:

247776

Hom.:

AF XY:

0.0000149

AC XY:

AN XY:

134038

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000442

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000590

AC:

AN:

1457920

Hom.:

Cov.:

AF XY:

0.0000565

AC XY:

AN XY:

725376

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000755

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000395

AC:

AN:

151798

Hom.:

Cov.:

AF XY:

0.0000675

AC XY:

AN XY:

74110

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000883

Gnomad4 OTH

AF:

0.00

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jul 06, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1003G>A (p.A335T) alteration is located in exon 7 (coding exon 7) of the KCNH5 gene. This alteration results from a G to A substitution at nucleotide position 1003, causing the alanine (A) at amino acid position 335 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Early infantile epileptic encephalopathy with suppression bursts

Uncertain:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 335 of the KCNH5 protein (p.Ala335Thr). This variant is present in population databases (rs376158544, gnomAD 0.004%). This missense change has been observed in individual(s) with clinical features of KCNH5-related conditions (internal data). ClinVar contains an entry for this variant (Variation ID: 461384). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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

Pathogenic

0.85

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.25

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.68

D;.;.

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.98

D;D;D

M_CAP

Uncertain

0.28

MetaRNN

Pathogenic

0.76

D;D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Benign

1.5

L;L;.

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-1.7

N;N;N

REVEL

Pathogenic

0.81

Sift

Benign

0.034

D;T;D

Sift4G

Uncertain

0.050

T;T;D

Polyphen

0.83

P;P;P

Vest4

0.74

MVP

0.92

MPC

1.7

ClinPred

0.73

GERP RS

5.8

Varity_R

0.30

gMVP

0.72

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over