14-62707587-G-A

Position:

• chr14-62707587-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_139318.5(KCNH5):​c.2888C>T​(p.Pro963Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000725 in 1,379,422 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: KCNH5 NM_139318.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.26

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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=0.11289963).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNH5	NM_139318.5	c.2888C>T	p.Pro963Leu	missense_variant	11/11	ENST00000322893.12	NP_647479.2
KCNH5	NM_172375.3	c.*855C>T		3_prime_UTR_variant	10/10		NP_758963.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNH5	ENST00000322893.12	c.2888C>T	p.Pro963Leu	missense_variant	11/11	1	NM_139318.5	ENSP00000321427	P1
KCNH5	ENST00000420622.6	c.*855C>T		3_prime_UTR_variant	10/10	1		ENSP00000395439

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.25e-7 AC: 1 AN: 1379422 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 675510

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: 9.35e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

May 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. This variant has not been reported in the literature in individuals affected with KCNH5-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 963 of the KCNH5 protein (p.Pro963Leu). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Uncertain	0.076	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Benign	0.95
DEOGEN2	Benign	0.17	T
Eigen	Benign	-0.12
Eigen_PC	Benign	0.10
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.11	T
MetaSVM	Uncertain	0.60	D
MutationAssessor	Benign	1.0	L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.2	N
REVEL	Uncertain	0.36
Sift	Benign	0.052	T
Sift4G	Benign	0.35	T
Polyphen		0.0	B
Vest4		0.11
MutPred		0.26		Gain of catalytic residue at P966 (P = 0);
MVP		0.43
MPC		0.11
ClinPred		0.57	D
GERP RS		5.4
Varity_R		0.088
gMVP		0.32

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr14-63174305;