8-132129551-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_004519.4(KCNQ3):c.2330G>A(p.Arg777Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000415 in 1,614,004 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 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. R777W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00030 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00043 ( 1 hom. )

Consequence

KCNQ3
NM_004519.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 0.545

Publications

4 publications found

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 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
seizures, benign familial neonatal, 2
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
self-limited familial neonatal epilepsy
Inheritance: AD Classification: MODERATE Submitted by: ClinGen
benign familial infantile epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
benign neonatal seizures
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
genetic developmental and epileptic encephalopathy
Inheritance: AR Classification: LIMITED Submitted by: ClinGen, Ambry Genetics

KCNQ3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0096952915).

BP6

Variant 8-132129551-C-T is Benign according to our data. Variant chr8-132129551-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 205990.

BS1

Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.000427 (624/1461882) while in subpopulation NFE AF = 0.000454 (505/1112010). AF 95% confidence interval is 0.000421. There are 1 homozygotes in GnomAdExome4. There are 303 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004519.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNQ3	NM_004519.4	MANE Select	c.2330G>A	p.Arg777Gln	missense	Exon 15 of 15	NP_004510.1
	KCNQ3	NM_001204824.2		c.1970G>A	p.Arg657Gln	missense	Exon 15 of 15	NP_001191753.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
KCNQ3	ENST00000388996.10	TSL:1 MANE Select	c.2330G>A	p.Arg777Gln	missense	Exon 15 of 15	ENSP00000373648.3
KCNQ3	ENST00000519445.5	TSL:5	c.2294G>A	p.Arg765Gln	missense	Exon 15 of 15	ENSP00000428790.1
KCNQ3	ENST00000521134.6	TSL:2	c.1970G>A	p.Arg657Gln	missense	Exon 15 of 15	ENSP00000429799.1

Frequencies

GnomAD3 genomes

AF:

0.000302

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00104

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000294

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000386

AC:

AN:

251098

AF XY:

0.000413

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00157

Gnomad NFE exome

AF:

0.000458

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000427

AC:

624

AN:

1461882

Hom.:

Cov.:

AF XY:

0.000417

AC XY:

303

AN XY:

727242

show subpopulations

African (AFR)

AF:

0.000149

AC:

AN:

33480

American (AMR)

AF:

0.000179

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00154

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000454

AC:

505

AN:

1112010

Other (OTH)

AF:

0.000281

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

115

153

191

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

110

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000302

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.000363

AC XY:

AN XY:

74314

show subpopulations

African (AFR)

AF:

0.000121

AC:

AN:

41424

American (AMR)

AF:

0.000524

AC:

AN:

15270

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.000207

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00104

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000294

AC:

AN:

68022

Other (OTH)

AF:

0.000478

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000368

Hom.:

Bravo

AF:

0.000242

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000346

AC:

EpiCase

AF:

0.000382

EpiControl

AF:

0.000356

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Benign neonatal seizures (2)

not provided (2)

Inborn genetic diseases (1)

Seizures, benign familial neonatal, 2 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.60

CADD

Benign

7.4

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.30

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.28

LIST_S2

Benign

0.57

M_CAP

Benign

0.0072

MetaRNN

Benign

0.0097

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.1

PhyloP100

0.55

PrimateAI

Benign

0.20

PROVEAN

Benign

-0.76

REVEL

Benign

0.018

Sift

Benign

0.065

Sift4G

Benign

0.089

Polyphen

0.0020

Vest4

0.11

MVP

0.39

MPC

0.11

ClinPred

0.013

GERP RS

1.8

Varity_R

0.044

gMVP

0.18

Mutation Taster

=87/13

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over