Variant 1-155277663-G-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_020897.3(HCN3):c.73G>A(p.Val25Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000713 in 1,403,160 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

HCN3
NM_020897.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.0850

Variant links:

Genes affected

HCN3 (HGNC:19183): (hyperpolarization activated cyclic nucleotide gated potassium channel 3) This gene encodes a multi-pass membrane protein that functions as a voltage gated cation channel. The encoded protein is a member of a family of closely related cyclic adenosine monophosphate-binding channel proteins. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

HCN3 links:

CLK2 (HGNC:2069): (CDC like kinase 2) This gene encodes a dual specificity protein kinase that phosphorylates serine/threonine and tyrosine-containing substrates. Activity of this protein regulates serine- and arginine-rich (SR) proteins of the spliceosomal complex, thereby influencing alternative transcript splicing. Chromosomal translocations have been characterized between this locus and the PAFAH1B3 (platelet-activating factor acetylhydrolase 1b, catalytic subunit 3 (29kDa)) gene on chromosome 19, resulting in the production of a fusion protein. Note that this gene is distinct from the TELO2 gene (GeneID:9894), which shares the CLK2 alias, but encodes a protein that is involved in telomere length regulation. There is a pseudogene for this gene on chromosome 7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

CLK2 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.06470251).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HCN3	NM_020897.3 linkuse as main transcript	c.73G>A	p.Val25Ile	missense_variant	1/8	ENST00000368358.4	NP_065948.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
HCN3	ENST00000368358.4 linkuse as main transcript	c.73G>A	p.Val25Ile	missense_variant	1/8	1	NM_020897.3	ENSP00000357342	P1
CLK2	ENST00000471047.1 linkuse as main transcript	n.117+712C>T		intron_variant, non_coding_transcript_variant		3
HCN3	ENST00000496230.5 linkuse as main transcript			upstream_gene_variant		2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000627

AC:

AN:

159574

Hom.:

AF XY:

0.0000117

AC XY:

AN XY:

85450

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000858

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.13e-7

AC:

AN:

1403160

Hom.:

Cov.:

AF XY:

0.00000144

AC XY:

AN XY:

692686

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000275

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 15, 2024

The c.73G>A (p.V25I) alteration is located in exon 1 (coding exon 1) of the HCN3 gene. This alteration results from a G to A substitution at nucleotide position 73, causing the valine (V) at amino acid position 25 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.087

BayesDel_noAF

Benign

-0.36

CADD

Benign

DANN

Benign

0.90

DEOGEN2

Benign

0.052

Eigen

Benign

-0.97

Eigen_PC

Benign

-0.95

FATHMM_MKL

Benign

0.024

M_CAP

Benign

0.050

MetaRNN

Benign

0.065

MetaSVM

Uncertain

-0.27

MutationAssessor

Benign

0.0

MutationTaster

Benign

0.94

N;N

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-0.34

REVEL

Benign

0.20

Sift

Benign

0.38

Sift4G

Benign

0.41

Polyphen

0.0

Vest4

0.092

MutPred

0.13

Loss of glycosylation at P24 (P = 0.2116);

MVP

0.80

MPC

0.39

ClinPred

0.020

GERP RS

1.4

Varity_R

0.036

gMVP

0.21

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