NM_004700.4:c.946-3T>A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_004700.4(KCNQ4):c.946-3T>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000872 in 1,604,714 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

KCNQ4
NM_004700.4 splice_region, intron

Scores

Splicing: ADA: 0.03058

Clinical Significance

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

Conservation

PhyloP100: 0.166

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 -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.69).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4 link	c.946-3T>A		splice_region_variant, intron_variant	Intron 6 of 13	ENST00000347132.10	NP_004691.2	P56696-1B3KQH8

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNQ4	ENST00000347132.10 link	c.946-3T>A	splice_region_variant, intron_variant	Intron 6 of 13	1	NM_004700.4	ENSP00000262916.6	P56696-1
KCNQ4	ENST00000509682.6 link	c.946-3T>A	splice_region_variant, intron_variant	Intron 6 of 12	5		ENSP00000423756.2	P56696-2
KCNQ4	ENST00000443478.3 link	c.631-3T>A	splice_region_variant, intron_variant	Intron 5 of 12	5		ENSP00000406735.3	H0Y6N7
KCNQ4	ENST00000506017.1 link	n.265-3T>A	splice_region_variant, intron_variant	Intron 3 of 10	2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000854

AC:

AN:

234088

AF XY:

0.00000789

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000191

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000895

AC:

AN:

1452608

Hom.:

Cov.:

AF XY:

0.00000831

AC XY:

AN XY:

722044

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33180

American (AMR)

AF:

0.00

AC:

AN:

43418

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25904

East Asian (EAS)

AF:

0.00

AC:

AN:

39144

South Asian (SAS)

AF:

0.00

AC:

AN:

84902

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52656

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.0000117

AC:

AN:

1107592

Other (OTH)

AF:

0.00

AC:

AN:

60052

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

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:

0.00000657

AC:

AN:

152106

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74310

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41418

American (AMR)

AF:

0.00

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

67982

Other (OTH)

AF:

0.00

AC:

AN:

2086

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

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:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 19, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.946-3T>A variant in KCNQ4 has not been previously reported in individuals with hearing loss or in large population studies. This variant is located in the 3' splice region. Computational tools do not suggest a strong impact to splicin g. However, this information is not predictive enough to rule out pathogenicity. In summary, the clinical significance of the c.946-3T>A variant is uncertain. -

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

Oct 14, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ClinVar contains an entry for this variant (Variation ID: 228774). This variant has not been reported in the literature in individuals affected with KCNQ4-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.002%). This sequence change falls in intron 6 of the KCNQ4 gene. It does not directly change the encoded amino acid sequence of the KCNQ4 protein. It affects a nucleotide within the consensus splice site. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.69

CADD

Benign

(source)

DANN

Benign

0.74

PhyloP100

0.17

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.031

dbscSNV1_RF

Benign

0.31

SpliceAI score (max)

0.36

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.36

Position offset: 33

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