Genetic Variant HCN2:p.Ser81Leu (chr19-590187-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM2BP4_ModerateBS1

The NM_001194.4(HCN2):c.242C>T(p.Ser81Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000209 in 143,838 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 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. S81W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000021 ( 0 hom., cov: 29)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

HCN2
NM_001194.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.353

Variant links:

Genes affected

HCN2 (HGNC:4846): (hyperpolarization activated cyclic nucleotide gated potassium and sodium channel 2) The protein encoded by this gene is a hyperpolarization-activated cation channel involved in the generation of native pacemaker activity in the heart and in the brain. The encoded protein is activated by cAMP and can produce a fast, large current. Defects in this gene were noted as a possible cause of some forms of epilepsy. [provided by RefSeq, Jan 2017]

HCN2 links:

ENSG00000267036 (HGNC:):

ENSG00000267036 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.15096852).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0000209 (3/143838) while in subpopulation NFE AF= 0.0000463 (3/64820). AF 95% confidence interval is 0.0000123. There are 0 homozygotes in gnomad4. There are 0 alleles in male gnomad4 subpopulation. Median coverage is 29. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HCN2	NM_001194.4 link	c.242C>T	p.Ser81Leu	missense_variant	Exon 1 of 8	ENST00000251287.3	NP_001185.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HCN2	ENST00000251287.3 link	c.242C>T	p.Ser81Leu	missense_variant	Exon 1 of 8	1	NM_001194.4	ENSP00000251287.1		Q9UL51
ENSG00000267036	ENST00000589661.2 link	n.*243G>A		downstream_gene_variant		6

Frequencies

GnomAD3 genomes

AF:

0.0000209

AC:

AN:

143838

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000463

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

837390

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

387754

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

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

AF:

0.0000209

AC:

AN:

143838

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

69906

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000463

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.073

BayesDel_noAF

Benign

-0.34

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.21

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.023

LIST_S2

Benign

0.57

M_CAP

Pathogenic

0.83

MetaRNN

Benign

0.15

MetaSVM

Uncertain

-0.066

MutationAssessor

Benign

0.34

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

-0.98

REVEL

Benign

0.27

Sift

Benign

0.033

Sift4G

Benign

0.31

Polyphen

0.032

Vest4

0.084

MutPred

0.24

Loss of phosphorylation at S81 (P = 0.0015);

MVP

0.70

MPC

1.4

ClinPred

0.10

Varity_R

0.12

gMVP

0.21

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

LitVar

Other links and lift over