1-40824233-A-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_004700.4(KCNQ4):c.1267A>C(p.Ser423Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000106 in 1,608,684 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S423G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

KCNQ4
NM_004700.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.56

Publications

0 publications found

Variant links:

Genes affected

KCNQ4 (HGNC:6298): (potassium voltage-gated channel subfamily Q member 4) The protein encoded by this gene forms a potassium channel that is thought to play a critical role in the regulation of neuronal excitability, particularly in sensory cells of the cochlea. The current generated by this channel is inhibited by M1 muscarinic acetylcholine receptors and activated by retigabine, a novel anti-convulsant drug. The encoded protein can form a homomultimeric potassium channel or possibly a heteromultimeric channel in association with the protein encoded by the KCNQ3 gene. Defects in this gene are a cause of nonsyndromic sensorineural deafness type 2 (DFNA2), an autosomal dominant form of progressive hearing loss. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

KCNQ4 Gene-Disease associations (from GenCC):

autosomal dominant nonsyndromic hearing loss 2A
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia
nonsyndromic genetic hearing loss
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
autosomal dominant nonsyndromic hearing loss
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hearing loss disorder
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

KCNQ4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.14562634).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4 link	c.1267A>C	p.Ser423Arg	missense_variant	Exon 9 of 14	ENST00000347132.10	NP_004691.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
KCNQ4	ENST00000347132.10 link	c.1267A>C	p.Ser423Arg	missense_variant	Exon 9 of 14	1	NM_004700.4	ENSP00000262916.6
KCNQ4	ENST00000506017.1 link	n.586A>C		non_coding_transcript_exon_variant	Exon 6 of 11	2
KCNQ4	ENST00000509682.6 link	c.1130+1831A>C		intron_variant	Intron 8 of 12	5		ENSP00000423756.2
KCNQ4	ENST00000443478.3 link	c.815+1831A>C		intron_variant	Intron 7 of 12	5		ENSP00000406735.3

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000217

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000131

AC:

AN:

228230

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000150

Gnomad AMR exome

AF:

0.0000295

Gnomad ASJ exome

AF:

0.00

Gnomad EAS 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:

0.00000275

AC:

AN:

1456380

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

724182

show subpopulations

African (AFR)

AF:

0.0000898

AC:

AN:

33398

American (AMR)

AF:

0.00

AC:

AN:

44472

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26020

East Asian (EAS)

AF:

0.00

AC:

AN:

39518

South Asian (SAS)

AF:

0.00

AC:

AN:

85526

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51324

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1110282

Other (OTH)

AF:

0.0000166

AC:

AN:

60088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.0000854

AC:

AN:

152304

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74470

show subpopulations

African (AFR)

AF:

0.000289

AC:

AN:

41576

American (AMR)

AF:

0.0000653

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68012

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

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:

0.00

Hom.:

Bravo

AF:

0.0000340

ExAC

AF:

0.0000166

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 12, 2014

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant classified as Uncertain Significance - Favor Benign. The Ser423Arg varia nt in KCNQ4 has not been previously reported in individuals with hearing loss an d was absent from large population studies. Computational prediction tools and conservation analyses suggest this variant may not impact the protein, though th is information is not predictive enough to rule out pathogenicity. In summary, t he clinical significance of this variant cannot be determined with certainty; ho wever based upon the computational data, we would lean towards a more likely ben ign role. -

Autosomal dominant nonsyndromic hearing loss 2A

Uncertain:1

Apr 11, 2023

Genome-Nilou Lab

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Mar 03, 2023

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Benign

-0.00086

BayesDel_noAF

Uncertain

0.020

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.19

T;T

Eigen

Benign

-0.20

Eigen_PC

Benign

0.019

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.61

.;T

M_CAP

Pathogenic

0.42

MetaRNN

Benign

0.15

T;T

MetaSVM

Uncertain

0.72

MutationAssessor

Benign

0.60

N;N

PhyloP100

2.6

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-0.95

.;N

REVEL

Uncertain

0.55

Sift

Benign

0.24

.;T

Sift4G

Benign

0.52

.;T

Polyphen

0.18

B;B

Vest4

0.59

MutPred

0.23

Loss of glycosylation at S423 (P = 0.0071);Loss of glycosylation at S423 (P = 0.0071);

MVP

0.73

MPC

0.14

ClinPred

0.15

GERP RS

5.5

Varity_R

0.26

gMVP

0.65

Mutation Taster

=83/17

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over