rs777648103

Variant names:

• chr15-73323263-C-A
• rs777648103
• NM_005477.3:c.2830G>T

Your query was ambiguous. Multiple possible variants found:

• chr15-73323263-C-A
• chr15-73323263-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005477.3(HCN4):​c.2830G>T​(p.Ala944Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000218 in 1,373,074 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. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A944T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: HCN4 NM_005477.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.36
• Publications: 0 publications found

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: DEFINITIVE, STRONG Submitted by: ClinGen, Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Brugada syndrome 8

  Inheritance: AD Classification: MODERATE, LIMITED Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• familial sick sinus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Brugada syndrome 1

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

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=0.13132012).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005477.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HCN4	NM_005477.3	MANE Select	c.2830G>T	p.Ala944Ser	missense	Exon 8 of 8	NP_005468.1	Q9Y3Q4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HCN4	ENST00000261917.4	TSL:1 MANE Select	c.2830G>T	p.Ala944Ser	missense	Exon 8 of 8	ENSP00000261917.3	Q9Y3Q4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000144 AC: 2 AN: 139332 AF XY: 0.0000269

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000342

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000218 AC: 3 AN: 1373074 Hom.: 0 Cov.: 34 AF XY: 0.00000297 AC XY: 2 AN XY: 672678

African (AFR) AF: 0.00 AC: 0 AN: 31924

American (AMR) AF: 0.00 AC: 0 AN: 33024

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22126

East Asian (EAS) AF: 0.00 AC: 0 AN: 37940

South Asian (SAS) AF: 0.00 AC: 0 AN: 73350

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 44926

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5204

European-Non Finnish (NFE) AF: 0.00000281 AC: 3 AN: 1067792

Other (OTH) AF: 0.00 AC: 0 AN: 56788

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000869 AC: 1

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Brugada syndrome 8 (1)
-	1	-	Cardiovascular phenotype (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	5.7
DANN	Benign	0.44
DEOGEN2	Benign	0.21	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.035	N
LIST_S2	Benign	0.37	T
M_CAP	Pathogenic	0.70	D
MetaRNN	Benign	0.13	T
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Benign	0.20	N
PhyloP100		1.4
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-0.070	N
REVEL	Benign	0.19
Sift	Benign	0.47	T
Sift4G	Benign	0.63	T
Polyphen		0.011	B
Vest4		0.075
MutPred		0.18		Gain of phosphorylation at A944 (P = 0.0041)
MVP		0.59
MPC		0.16
ClinPred		0.0085	T
GERP RS		0.99
Varity_R		0.029
gMVP		0.15
Mutation Taster		=94/6	polymorphism

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

Other links and lift over

dbSNP: rs777648103; hg19: chr15-73615604;