Genetic Variant KCNQ4:p.Gly60Arg (chr1-40784271-G-C) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_004700.4(KCNQ4):c.178G>C(p.Gly60Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000263 in 1,519,778 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 (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000022 ( 0 hom. )

Consequence

KCNQ4
NM_004700.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.40

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:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.33688825).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4 link	c.178G>C	p.Gly60Arg	missense_variant	Exon 1 of 14	ENST00000347132.10	NP_004691.2	P56696-1B3KQH8
KCNQ4	NM_172163.3 link	c.178G>C	p.Gly60Arg	missense_variant	Exon 1 of 13		NP_751895.1	P56696-2B3KQH8
KCNQ4	XM_047434057.1 link	c.178G>C	p.Gly60Arg	missense_variant	Exon 1 of 13		XP_047290013.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ4	ENST00000347132.10 link	c.178G>C	p.Gly60Arg	missense_variant	Exon 1 of 14	1	NM_004700.4	ENSP00000262916.6		P56696-1
KCNQ4	ENST00000509682.6 link	c.178G>C	p.Gly60Arg	missense_variant	Exon 1 of 13	5		ENSP00000423756.2		P56696-2

Frequencies

GnomAD3 genomes

AF:

0.00000663

AC:

AN:

150840

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000659

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

GnomAD4 exome

AF:

0.00000219

AC:

AN:

1368938

Hom.:

Cov.:

AF XY:

0.00000148

AC XY:

AN XY:

677250

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:

9.33e-7

Gnomad4 OTH exome

AF:

0.0000177

GnomAD4 genome

AF:

0.00000663

AC:

AN:

150840

Hom.:

Cov.:

AF XY:

0.0000136

AC XY:

AN XY:

73612

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000659

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Sep 13, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.178G>C (p.G60R) alteration is located in exon 1 (coding exon 1) of the KCNQ4 gene. This alteration results from a G to C substitution at nucleotide position 178, causing the glycine (G) at amino acid position 60 to be replaced by an arginine (R). 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

0.25

BayesDel_addAF

Uncertain

0.073

BayesDel_noAF

Benign

-0.13

CADD

Pathogenic

DANN

Benign

0.83

DEOGEN2

Benign

0.17

T;T;.

Eigen

Benign

-0.46

Eigen_PC

Benign

-0.40

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.63

.;T;T

M_CAP

Pathogenic

0.99

MetaRNN

Benign

0.34

T;T;T

MetaSVM

Uncertain

0.53

MutationAssessor

Benign

0.0

N;N;N

PrimateAI

Pathogenic

0.94

PROVEAN

Benign

0.30

.;N;N

REVEL

Uncertain

0.39

Sift

Benign

0.92

.;T;T

Sift4G

Benign

0.62

.;T;T

Polyphen

0.36

B;B;P

Vest4

0.22, 0.32

MutPred

0.27

Loss of relative solvent accessibility (P = 0.0676);Loss of relative solvent accessibility (P = 0.0676);Loss of relative solvent accessibility (P = 0.0676);

MVP

0.71

MPC

2.5

ClinPred

0.24

GERP RS

2.3

Varity_R

0.079

gMVP

0.51

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