chr14-62707585-G-C

Position:

• chr14-62707585-G-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_139318.5(KCNH5):​c.2890C>G​(p.Gln964Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000138 in 1,375,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict 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. Q964K) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: KCNH5 NM_139318.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.34

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]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KCNH5. . Gene score misZ 2.509 (greater than the threshold 3.09). Trascript score misZ 3.7308 (greater than threshold 3.09). GenCC has associacion of gene with infantile-onset epilepsy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.15175894).
• BS2: High AC in GnomAdExome4 at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNH5	NM_139318.5	c.2890C>G	p.Gln964Glu	missense_variant	11/11	ENST00000322893.12
KCNH5	NM_172375.3	c.*857C>G		3_prime_UTR_variant	10/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNH5	ENST00000322893.12	c.2890C>G	p.Gln964Glu	missense_variant	11/11	1	NM_139318.5	P1
KCNH5	ENST00000420622.6	c.*857C>G		3_prime_UTR_variant	10/10	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000309 AC: 6 AN: 194438 Hom.: 0 AF XY: 0.0000293 AC XY: 3 AN XY: 102522

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000198

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: 0.0000108

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000138 AC: 19 AN: 1375954 Hom.: 0 Cov.: 29 AF XY: 0.0000119 AC XY: 8 AN XY: 673614

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000147

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000141

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000122

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Early infantile epileptic encephalopathy with suppression bursts Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 25, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt KCNH5 protein function. ClinVar contains an entry for this variant (Variation ID: 568811). This variant has not been reported in the literature in individuals affected with KCNH5-related conditions. This variant is present in population databases (rs753525158, gnomAD 0.02%). This sequence change replaces glutamine, which is neutral and polar, with glutamic acid, which is acidic and polar, at codon 964 of the KCNH5 protein (p.Gln964Glu). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.072	T
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	21
DANN	Benign	0.96
DEOGEN2	Benign	0.096	T
Eigen	Benign	-0.24
Eigen_PC	Benign	0.029
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.75	T
M_CAP	Benign	0.057	D
MetaRNN	Benign	0.15	T
MetaSVM	Uncertain	0.49	D
MutationAssessor	Benign	0.69	N
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	0.080	N
REVEL	Uncertain	0.45
Sift	Benign	0.037	D
Sift4G	Benign	0.43	T
Polyphen		0.0040	B
Vest4		0.20
MutPred		0.20		Gain of catalytic residue at P966 (P = 0);
MVP		0.51
MPC		0.12
ClinPred		0.12	T
GERP RS		5.4
Varity_R		0.13
gMVP		0.13

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

Other links and lift over

dbSNP: rs753525158; hg19: chr14-63174303;