rs199942237

Positions:

chr8-132129917-G-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_ModerateBP6_Very_StrongBS2

The NM_004519.4(KCNQ3):c.1964C>T(p.Thr655Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000283 in 1,613,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00029 ( 0 hom. )

Consequence

KCNQ3
NM_004519.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 3.10

Variant links:

Genes affected

KCNQ3 (HGNC:6297): (potassium voltage-gated channel subfamily Q member 3) This gene encodes a protein that functions in the regulation of neuronal excitability. The encoded protein forms an M-channel by associating with the products of the related KCNQ2 or KCNQ5 genes, which both encode integral membrane proteins. M-channel currents are inhibited by M1 muscarinic acetylcholine receptors and are activated by retigabine, a novel anti-convulsant drug. Defects in this gene are a cause of benign familial neonatal convulsions type 2 (BFNC2), also known as epilepsy, benign neonatal type 2 (EBN2). Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2014]

KCNQ3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.25254658).

BP6

Variant 8-132129917-G-A is Benign according to our data. Variant chr8-132129917-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 378036.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS2

High AC in GnomAd4 at 28 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ3	NM_004519.4 linkuse as main transcript	c.1964C>T	p.Thr655Met	missense_variant	15/15	ENST00000388996.10	NP_004510.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ3	ENST00000388996.10 linkuse as main transcript	c.1964C>T	p.Thr655Met	missense_variant	15/15	1	NM_004519.4	ENSP00000373648	P1	O43525-1

Frequencies

GnomAD3 genomes

AF:

0.000184

AC:

AN:

152068

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000215

AC:

AN:

251482

Hom.:

AF XY:

0.000250

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000378

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000293

AC:

429

AN:

1461882

Hom.:

Cov.:

AF XY:

0.000296

AC XY:

215

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000176

Gnomad4 SAS exome

AF:

0.0000927

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000341

Gnomad4 OTH exome

AF:

0.000414

GnomAD4 genome

AF:

0.000184

AC:

AN:

152068

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74276

show subpopulations

Gnomad4 AFR

AF:

0.000121

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000294

Hom.:

Bravo

AF:

0.000189

ExAC

AF:

0.000181

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000474

ClinVar

Significance: Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 15, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2023	KCNQ3: BS2 -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 18, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Benign neonatal seizures

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.087

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.12

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.28

T;.;.;.;.

Eigen

Benign

-0.19

Eigen_PC

Benign

-0.21

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.80

T;T;T;T;T

M_CAP

Pathogenic

0.37

MetaRNN

Benign

0.25

T;T;T;T;T

MetaSVM

Pathogenic

0.98

MutationAssessor

Benign

1.8

L;.;.;.;.

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.29

PROVEAN

Benign

0.13

N;.;N;N;.

REVEL

Uncertain

0.39

Sift

Benign

0.049

D;.;D;D;.

Sift4G

Uncertain

0.056

T;T;T;T;.

Polyphen

0.77

P;.;.;P;.

Vest4

0.053

MVP

0.57

MPC

0.11

ClinPred

0.046

GERP RS

3.9

Varity_R

0.036

gMVP

0.31

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