8-98429067-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_020697.4(KCNS2):c.1088C>T(p.Ala363Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,788 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

KCNS2
NM_020697.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.91

Variant links:

Genes affected

KCNS2 (HGNC:6301): (potassium voltage-gated channel modifier subfamily S member 2) Predicted to enable voltage-gated potassium channel activity. Predicted to be involved in potassium ion transmembrane transport and regulation of delayed rectifier potassium channel activity. Predicted to be located in perinuclear region of cytoplasm and plasma membrane. Predicted to be part of voltage-gated potassium channel complex. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

KCNS2 links:

STK3 (HGNC:11406): (serine/threonine kinase 3) This gene encodes a serine/threonine protein kinase activated by proapoptotic molecules indicating the encoded protein functions as a growth suppressor. Cleavage of the protein product by caspase removes the inhibitory C-terminal portion. The N-terminal portion is transported to the nucleus where it homodimerizes to form the active kinase which promotes the condensation of chromatin during apoptosis. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

STK3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
KCNS2	NM_020697.4 linkuse as main transcript	c.1088C>T	p.Ala363Val	missense_variant	2/2	ENST00000287042.5
STK3	XM_047422133.1 linkuse as main transcript	c.1423+8036G>A		intron_variant
STK3	XR_007060752.1 linkuse as main transcript	n.1571+8036G>A		intron_variant, non_coding_transcript_variant
STK3	XR_007060753.1 linkuse as main transcript	n.1571+8036G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
KCNS2	ENST00000287042.5 linkuse as main transcript	c.1088C>T	p.Ala363Val	missense_variant	2/2	1	NM_020697.4	P1
KCNS2	ENST00000521839.1 linkuse as main transcript	c.1088C>T	p.Ala363Val	missense_variant	2/2	5		P1
STK3	ENST00000517832.1 linkuse as main transcript	n.483+5060G>A		intron_variant, non_coding_transcript_variant		3
STK3	ENST00000649151.1 linkuse as main transcript	n.427+5060G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251154

Hom.:

AF XY:

0.0000295

AC XY:

AN XY:

135732

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000326

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1460788

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726502

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000756

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.:

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 17, 2023

The c.1088C>T (p.A363V) alteration is located in exon 2 (coding exon 1) of the KCNS2 gene. This alteration results from a C to T substitution at nucleotide position 1088, causing the alanine (A) at amino acid position 363 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Pathogenic

0.31

Cadd

Uncertain

Dann

Uncertain

0.99

DEOGEN2

Uncertain

0.71

D;D

Eigen

Uncertain

0.34

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Pathogenic

0.98

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.65

D;D

MetaSVM

Uncertain

0.72

MutationAssessor

Benign

1.1

L;L

MutationTaster

Benign

1.0

D;D

PrimateAI

Pathogenic

0.79

PROVEAN

Benign

-1.8

N;N

REVEL

Pathogenic

0.69

Sift

Benign

0.086

T;T

Sift4G

Benign

0.24

T;T

Polyphen

0.83

P;P

Vest4

0.68

MutPred

0.59

Loss of helix (P = 0.1299);Loss of helix (P = 0.1299);

MVP

0.94

MPC

1.6

ClinPred

0.24

GERP RS

6.1

Varity_R

0.21

gMVP

0.93

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

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over