Genetic Variant HCN4:p.Pro1137Ala (chr15-73322684-G-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_005477.3(HCN4):c.3409C>G(p.Pro1137Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,439,942 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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. P1137S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

HCN4
NM_005477.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.91

Publications

0 publications found

Variant links:

Genes affected

HCN4 (HGNC:16882): (hyperpolarization activated cyclic nucleotide gated potassium channel 4) This gene encodes a member of the hyperpolarization-activated cyclic nucleotide-gated potassium channels. The encoded protein shows slow kinetics of activation and inactivation, and is necessary for the cardiac pacemaking process. This channel may also mediate responses to sour stimuli. Mutations in this gene have been linked to sick sinus syndrome 2, also known as atrial fibrillation with bradyarrhythmia or familial sinus bradycardia. Two pseudogenes have been identified on chromosome 15. [provided by RefSeq, Oct 2008]

HCN4 Gene-Disease associations (from GenCC):

sick sinus syndrome 2, autosomal dominant
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
Brugada syndrome 8
Inheritance: AD Classification: MODERATE, LIMITED Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
familial sick sinus syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial thoracic aortic aneurysm and aortic dissection
Inheritance: AD Classification: LIMITED Submitted by: ClinGen
Brugada syndrome 1
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

HCN4 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.13097018).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HCN4	NM_005477.3 link	c.3409C>G	p.Pro1137Ala	missense_variant	Exon 8 of 8	ENST00000261917.4	NP_005468.1	Q9Y3Q4
HCN4	XM_011521148.3 link	c.2191C>G	p.Pro731Ala	missense_variant	Exon 7 of 7		XP_011519450.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HCN4	ENST00000261917.4 link	c.3409C>G	p.Pro1137Ala	missense_variant	Exon 8 of 8	1	NM_005477.3	ENSP00000261917.3		Q9Y3Q4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.94e-7

AC:

AN:

1439942

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

714118

show subpopulations

African (AFR)

AF:

0.0000302

AC:

AN:

33142

American (AMR)

AF:

0.00

AC:

AN:

41590

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25682

East Asian (EAS)

AF:

0.00

AC:

AN:

38746

South Asian (SAS)

AF:

0.00

AC:

AN:

83238

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50180

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5702

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1102078

Other (OTH)

AF:

0.00

AC:

AN:

59584

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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.060

BayesDel_addAF

Uncertain

0.045

BayesDel_noAF

Benign

-0.17

CADD

Benign

8.8

(source)

DANN

Benign

0.70

DEOGEN2

Benign

0.21

Eigen

Benign

-0.73

Eigen_PC

Benign

-0.72

FATHMM_MKL

Benign

0.27

LIST_S2

Benign

0.52

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.13

MetaSVM

Uncertain

0.074

MutationAssessor

Benign

0.69

PhyloP100

2.9

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-0.56

REVEL

Benign

0.27

Sift

Benign

0.99

Sift4G

Benign

0.41

Polyphen

0.0010

Vest4

0.21

MutPred

0.21

Loss of glycosylation at P1137 (P = 0.0433);

MVP

0.79

MPC

0.55

ClinPred

0.11

GERP RS

3.0

Varity_R

0.032

gMVP

0.22

Mutation Taster

=86/14

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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15-73322684-G-C

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