rs587777493

Positions:

• chr5-45645220-A-G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_021072.4(HCN1):​c.814T>C​(p.Ser272Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HCN1 NM_021072.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.32

Genes affected

HCN1 (HGNC:4845): (hyperpolarization activated cyclic nucleotide gated potassium channel 1) The membrane protein encoded by this gene is a hyperpolarization-activated cation channel that contributes to the native pacemaker currents in heart and neurons. The encoded protein can homodimerize or heterodimerize with other pore-forming subunits to form a potassium channel. This channel may act as a receptor for sour tastes. [provided by RefSeq, Oct 2011]

HCN1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 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), HCN1. . Gene score misZ 3.6647 (greater than the threshold 3.09). Trascript score misZ 3.2427 (greater than threshold 3.09). GenCC has associacion of gene with generalized epilepsy with febrile seizures plus, type 10, undetermined early-onset epileptic encephalopathy, developmental and epileptic encephalopathy, 24, generalized epilepsy with febrile seizures plus.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.895
• PP5: Variant 5-45645220-A-G is Pathogenic according to our data. Variant chr5-45645220-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 139573.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HCN1	NM_021072.4	c.814T>C	p.Ser272Pro	missense_variant	2/8	ENST00000303230.6	NP_066550.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HCN1	ENST00000303230.6	c.814T>C	p.Ser272Pro	missense_variant	2/8	1	NM_021072.4	ENSP00000307342.4
HCN1	ENST00000673735.1	c.814T>C	p.Ser272Pro	missense_variant	2/9			ENSP00000501107.1
HCN1	ENST00000634658.1	c.814T>C	p.Ser272Pro	missense_variant	2/2	3		ENSP00000489134.1
HCN1	ENST00000637256.1	n.42T>C		non_coding_transcript_exon_variant	1/2	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Feb 02, 2017	The S272P variant in the HCN1 gene has been reported previously as de novo in one individual with early infantile epileptic encephalopathy (Nava et al., 2014). The S272P variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The S272P variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. Functional studies demonstrate that S272P exhibits a dominant-negative effect with loss of current and decreased number of channels present at the plasma membrane (Nava et al., 2014). Therefore, we interpret S272P as a pathogenic variant. -

Developmental and epileptic encephalopathy, 24 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 01, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.48
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D;T
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D;D
M_CAP	Pathogenic	0.55	D
MetaRNN	Pathogenic	0.90	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.5	M;.
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-4.7	D;.
REVEL	Pathogenic	0.95
Sift	Benign	0.031	D;.
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.59	P;.
Vest4		0.81
MutPred		0.71		Loss of MoRF binding (P = 0.0604);Loss of MoRF binding (P = 0.0604);
MVP		0.99
MPC		3.1
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.96
gMVP		0.99

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: rs587777493; hg19: chr5-45645322;