Genetic Variant KCNQ4:p.Asp406His (chr1-40824182-G-C) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_004700.4(KCNQ4):c.1216G>C(p.Asp406His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000141 in 1,420,228 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D406N) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

KCNQ4
NM_004700.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.51

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:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.29176706).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4 link	c.1216G>C	p.Asp406His	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.1216G>C	p.Asp406His	missense_variant	Exon 9 of 14	1	NM_004700.4	ENSP00000262916.6
KCNQ4	ENST00000506017.1 link	n.535G>C		non_coding_transcript_exon_variant	Exon 6 of 11	2
KCNQ4	ENST00000509682.6 link	c.1130+1780G>C		intron_variant	Intron 8 of 12	5		ENSP00000423756.2
KCNQ4	ENST00000443478.3 link	c.815+1780G>C		intron_variant	Intron 7 of 12	5		ENSP00000406735.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000141

AC:

AN:

1420228

Hom.:

Cov.:

AF XY:

0.00000142

AC XY:

AN XY:

703076

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32296

American (AMR)

AF:

0.00

AC:

AN:

39452

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25448

East Asian (EAS)

AF:

0.00

AC:

AN:

36872

South Asian (SAS)

AF:

0.0000123

AC:

AN:

81158

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48848

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5180

European-Non Finnish (NFE)

AF:

9.16e-7

AC:

AN:

1092292

Other (OTH)

AF:

0.00

AC:

AN:

58682

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Benign

-0.090

CADD

Uncertain

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.32

T;T

Eigen

Benign

0.096

Eigen_PC

Benign

0.21

FATHMM_MKL

Benign

0.63

LIST_S2

Benign

0.0

.;T

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.29

T;T

MetaSVM

Pathogenic

0.94

MutationAssessor

Benign

0.69

N;N

PhyloP100

2.5

PrimateAI

Uncertain

0.75

PROVEAN

Benign

0.0

.;N

REVEL

Benign

0.0

Sift

Pathogenic

0.0

.;T

Sift4G

Pathogenic

0.0

.;T

Vest4

0.0

ClinPred

0.76

GERP RS

4.6

Varity_R

0.19

gMVP

0.53

Mutation Taster

=96/4

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over