rs1060500106

Positions:

• chr15-73323089-C-G
• chr15-73323089-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005477.3(HCN4):​c.3004G>C​(p.Glu1002Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000699 in 1,430,664 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: HCN4 NM_005477.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.98

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28394365).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HCN4	NM_005477.3	c.3004G>C	p.Glu1002Gln	missense_variant	8/8	ENST00000261917.4	NP_005468.1
HCN4	XM_011521148.3	c.1786G>C	p.Glu596Gln	missense_variant	7/7		XP_011519450.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HCN4	ENST00000261917.4	c.3004G>C	p.Glu1002Gln	missense_variant	8/8	1	NM_005477.3	ENSP00000261917.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.99e-7 AC: 1 AN: 1430664 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 709268

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000255

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Brugada syndrome 8 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 14, 2018

This sequence change replaces glutamic acid with glutamine at codon 1002 of the HCN4 protein (p.Glu1002Gln). The glutamic acid residue is highly conserved and there is a small physicochemical difference between glutamic acid and glutamine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a HCN4-related disease. ClinVar contains an entry for this variant (Variation ID: 404131). Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Unknown"; Align-GVGD: "Class C25"). In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Uncertain	0.021	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	19
DANN	Benign	0.52
DEOGEN2	Benign	0.38	T
Eigen	Benign	-0.72
Eigen_PC	Benign	-0.70
FATHMM_MKL	Benign	0.061	N
LIST_S2	Benign	0.59	T
M_CAP	Pathogenic	0.84	D
MetaRNN	Benign	0.28	T
MetaSVM	Uncertain	-0.023	T
MutationAssessor	Benign	0.90	L
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	0.15	N
REVEL	Benign	0.20
Sift	Benign	0.36	T
Sift4G	Benign	0.60	T
Polyphen		0.035	B
Vest4		0.28
MutPred		0.18		Loss of solvent accessibility (P = 0.0083);
MVP		0.73
MPC		0.17
ClinPred		0.063	T
GERP RS		2.8
Varity_R		0.12
gMVP		0.53

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: rs1060500106; hg19: chr15-73615430;