5-45261959-G-T

Position:

• chr5-45261959-G-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. PP2 BP4_Strong BP6 BS2

The NM_021072.4(HCN1):​c.2635C>A​(p.Pro879Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000383 in 1,461,862 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P879L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000038 (0 hom.)
• Consequence: HCN1 NM_021072.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 2.11

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 Benign. Variant got -8 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), HCN1. . Gene score misZ 3.6647 (greater than the threshold 3.09). Trascript score misZ 3.2427 (greater than threshold 3.09). GenCC has associacion of gene with generalized epilepsy with febrile seizures plus, type 10, undetermined early-onset epileptic encephalopathy, developmental and epileptic encephalopathy, 24, generalized epilepsy with febrile seizures plus.
• BP4: Computational evidence support a benign effect (MetaRNN=0.027180672).
• BP6: Variant 5-45261959-G-T is Benign according to our data. Variant chr5-45261959-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 587861.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Benign=1}.
• BS2: High AC in GnomAdExome4 at 56 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HCN1	NM_021072.4	c.2635C>A	p.Pro879Thr	missense_variant	8/8	ENST00000303230.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HCN1	ENST00000303230.6	c.2635C>A	p.Pro879Thr	missense_variant	8/8	1	NM_021072.4	P2
HCN1	ENST00000673735.1	c.*860C>A		3_prime_UTR_variant	9/9			A2
HCN1	ENST00000637305.1	n.1798C>A		non_coding_transcript_exon_variant	7/7	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 250940 Hom.: 0 AF XY: 0.0000294 AC XY: 4 AN XY: 135866

Gnomad AFR exome AF: 0.0000629

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000924

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000383 AC: 56 AN: 1461862 Hom.: 0 Cov.: 32 AF XY: 0.0000275 AC XY: 20 AN XY: 727232

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000894

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000749

Gnomad4 NFE exome AF: 0.0000396

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.0000330 AC: 4

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 17, 2016

The p.P879T variant (also known as c.2635C>A), located in coding exon 8 of the HCN1 gene, results from a C to A substitution at nucleotide position 2635. The proline at codon 879 is replaced by threonine, an amino acid with highly similar properties. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. This amino acid position is not conserved however, threonine is a reference amino acid in several species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this variant remains unclear. -

Early infantile epileptic encephalopathy with suppression bursts Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 12, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	13
DANN	Benign	0.83
DEOGEN2	Benign	0.086	T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.64	T
M_CAP	Benign	0.047	D
MetaRNN	Benign	0.027	T
MetaSVM	Uncertain	-0.25	T
MutationAssessor	Benign	-0.11	N
MutationTaster	Benign	0.87	N
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.28
Sift	Benign	1.0	T
Sift4G	Benign	0.38	T
Polyphen		0.0	B
Vest4		0.052
MutPred		0.18		Gain of phosphorylation at P879 (P = 0.0384);
MVP		0.39
MPC		0.43
ClinPred		0.019	T
GERP RS		4.1
Varity_R		0.099
gMVP		0.19

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: rs761866949; hg19: chr5-45262061;