dbSNP rs750838439: HCN1:p.Val381Phe (chr5-45396581-C-A) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_021072.4(HCN1):c.1141G>T(p.Val381Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,588 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V381L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

HCN1
NM_021072.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 7.91

Publications

0 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

developmental and epileptic encephalopathy, 24
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
generalized epilepsy with febrile seizures plus
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
generalized epilepsy with febrile seizures plus, type 10
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

HCN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

PM1

In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_021072.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.898

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HCN1	NM_021072.4 link	c.1141G>T	p.Val381Phe	missense_variant	Exon 4 of 8	ENST00000303230.6	NP_066550.2	O60741Q86WJ6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
HCN1	ENST00000303230.6 link	c.1141G>T	p.Val381Phe	missense_variant	Exon 4 of 8	1	NM_021072.4	ENSP00000307342.4	O60741
HCN1	ENST00000673735.1 link	c.1141G>T	p.Val381Phe	missense_variant	Exon 4 of 9			ENSP00000501107.1	A0A669KB45
HCN1	ENST00000637305.1 link	n.304G>T		non_coding_transcript_exon_variant	Exon 3 of 7	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461588

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727112

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33468

American (AMR)

AF:

0.00

AC:

AN:

44688

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39638

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53410

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111868

Other (OTH)

AF:

0.00

AC:

AN:

60374

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.82

BayesDel_addAF

Pathogenic

0.52

BayesDel_noAF

Pathogenic

0.50

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Pathogenic

0.99

M_CAP

Uncertain

0.25

MetaRNN

Pathogenic

0.90

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.1

PhyloP100

7.9

PrimateAI

Pathogenic

0.80

PROVEAN

Uncertain

-4.3

REVEL

Pathogenic

0.79

Sift

Uncertain

0.0050

Sift4G

Uncertain

0.0080

Polyphen

0.79

Vest4

0.87

MutPred

0.71

Loss of stability (P = 0.1853);

MVP

0.99

MPC

2.9

ClinPred

0.99

GERP RS

5.4

Varity_R

0.60

gMVP

0.99

Mutation Taster

=6/94

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over