rs773975779

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_004700.4(KCNQ4):c.1193A>G(p.Glu398Gly) variant causes a missense change. The variant allele was found at a frequency of 0.0000357 in 1,570,100 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000034 ( 0 hom. )

Consequence

KCNQ4
NM_004700.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 4.39

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAd at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNQ4	NM_004700.4 linkuse as main transcript	c.1193A>G	p.Glu398Gly	missense_variant	9/14	ENST00000347132.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNQ4	ENST00000347132.10 linkuse as main transcript	c.1193A>G	p.Glu398Gly	missense_variant	9/14	1	NM_004700.4	P2	P56696-1
KCNQ4	ENST00000443478.3 linkuse as main transcript	c.816+1757A>G		intron_variant		5
KCNQ4	ENST00000509682.6 linkuse as main transcript	c.1130+1757A>G		intron_variant		5		A1	P56696-2
KCNQ4	ENST00000506017.1 linkuse as main transcript	n.512A>G		non_coding_transcript_exon_variant	6/11	2

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.000103

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000284

AC:

AN:

175816

Hom.:

AF XY:

0.0000104

AC XY:

AN XY:

95852

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000702

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000339

AC:

AN:

1417962

Hom.:

Cov.:

AF XY:

0.0000371

AC XY:

AN XY:

701628

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000422

Gnomad4 OTH exome

AF:

0.0000341

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74310

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000565

Hom.:

Bravo

AF:

0.0000529

ExAC

AF:

0.00000862

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

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 05, 2016

The p.Glu398Gly variant in KCNQ4 has not been previously reported in individuals with hearing loss and data from large population studies are insufficient to as sess the frequency of this variant. Glutamate (Glu) at position 398 is not conse rved in mammals or evolutionarily distant species and 1 mammal (domestic goat) c arries a glycine (Gly), supporting that this change may be tolerated. Additiona l computational prediction tools do not provide strong support for or against an impact to the protein. In summary, the clinical significance of the p.Glu398Gly variant is uncertain. -

Autosomal dominant nonsyndromic hearing loss 2A

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Apr 11, 2023

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 24, 2022

This sequence change replaces glutamic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 398 of the KCNQ4 protein (p.Glu398Gly). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 228769). This variant has not been reported in the literature in individuals affected with KCNQ4-related conditions. This variant is present in population databases (rs773975779, gnomAD 0.007%). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.31

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Pathogenic

0.20

Cadd

Uncertain

Dann

Uncertain

1.0

DEOGEN2

Benign

0.25

T;T

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.43

FATHMM_MKL

Uncertain

0.94

M_CAP

Pathogenic

0.30

MetaRNN

Uncertain

0.59

D;D

MetaSVM

Pathogenic

0.86

MutationAssessor

Benign

1.5

L;L

MutationTaster

Benign

1.0

D;N

PrimateAI

Uncertain

0.72

Polyphen

0.98

D;D

Vest4

0.49

MutPred

0.28

Gain of MoRF binding (P = 0.05);Gain of MoRF binding (P = 0.05);

MVP

0.91

MPC

0.16

ClinPred

0.38

GERP RS

5.7

Varity_R

0.18

gMVP

0.60

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