Genetic Variant HCN1:p.Val797Ala (chr5-45262204-A-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_021072.4(HCN1):c.2390T>C(p.Val797Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,712 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign 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. V797G) has been classified as Likely benign.

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: 4.34

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_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.05615452).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021072.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HCN1	NM_021072.4	MANE Select	c.2390T>C	p.Val797Ala	missense	Exon 8 of 8	NP_066550.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
HCN1	ENST00000303230.6	TSL:1 MANE Select	c.2390T>C	p.Val797Ala	missense	Exon 8 of 8	ENSP00000307342.4
HCN1	ENST00000637305.1	TSL:5	n.1553T>C		non_coding_transcript_exon	Exon 7 of 7
HCN1	ENST00000673735.1		c.*615T>C		3_prime_UTR	Exon 9 of 9	ENSP00000501107.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461712

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727176

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53248

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112004

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

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 v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.41

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.096

Eigen

Benign

-0.32

Eigen_PC

Benign

-0.070

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.64

M_CAP

Benign

0.021

MetaRNN

Benign

0.056

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.4

PhyloP100

4.3

PrimateAI

Uncertain

0.61

PROVEAN

Benign

0.38

REVEL

Benign

0.23

Sift

Benign

0.38

Sift4G

Benign

0.98

Polyphen

0.0

Vest4

0.015

MutPred

0.20

Loss of sheet (P = 0.0126)

MVP

0.31

MPC

0.46

ClinPred

0.55

GERP RS

5.0

Varity_R

0.084

gMVP

0.13

Mutation Taster

=84/16

polymorphism

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over