5-45261962-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_021072.4(HCN1):c.2632G>C(p.Asp878His) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. D878E) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HCN1 NM_021072.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.56

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, HCN1
• BP4: Computational evidence support a benign effect (MetaRNN=0.29632366).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HCN1	NM_021072.4	c.2632G>C	p.Asp878His	missense_variant	8/8	ENST00000303230.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HCN1	ENST00000303230.6	c.2632G>C	p.Asp878His	missense_variant	8/8	1	NM_021072.4	P2
HCN1	ENST00000673735.1	c.*857G>C		3_prime_UTR_variant	9/9			A2
HCN1	ENST00000637305.1	n.1795G>C		non_coding_transcript_exon_variant	7/7	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 08, 2018

The p.D878H variant (also known as c.2632G>C), located in coding exon 8 of the HCN1 gene, results from a G to C substitution at nucleotide position 2632. The aspartic acid at codon 878 is replaced by histidine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Benign	0.23	T
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.74	T
M_CAP	Uncertain	0.23	D
MetaRNN	Benign	0.30	T
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Benign	0.69	N
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.59	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.42
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.012	D
Polyphen		0.77	P
Vest4		0.12
MutPred		0.18		Gain of glycosylation at T877 (P = 0.0738);
MVP		0.58
MPC		0.78
ClinPred		0.77	D
GERP RS		5.0
Varity_R		0.26
gMVP		0.37

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-45262064;