1-40819358-C-G

Variant names:

• chr1-40819358-C-G
• rs752131356
• NM_004700.4:c.720C>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP7 BP4

This summary comes from the ClinGen Evidence Repository: The silent p.Thr240= variant in KCNQ4 is not predicted by computational tools to impact splicing (BP7. BP4). The variant is absent from the Genome Aggregation Database (http://gnomad.broadinstitute.org), however this is not considered evidence against a likely benign classification. In summary, this variant meets criteria to be classified as likely benign. ACMG/AMP criteria applied: BP7, BP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA10576423/MONDO:0005365/005

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: KCNQ4 NM_004700.4 synonymous
• Clinical Significance: Likely benign reviewed by expert panel B:3
• Conservation: PhyloP100: -0.807

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: For more information check the summary or visit ClinGen Evidence Repository.
• BP7: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4	c.720C>G	p.Thr240Thr	synonymous_variant	Exon 5 of 14	ENST00000347132.10	NP_004691.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ4	ENST00000347132.10	c.720C>G	p.Thr240Thr	synonymous_variant	Exon 5 of 14	1	NM_004700.4	ENSP00000262916.6
KCNQ4	ENST00000509682.6	c.720C>G	p.Thr240Thr	synonymous_variant	Exon 5 of 13	5		ENSP00000423756.2
KCNQ4	ENST00000443478.3	c.405C>G	p.Thr135Thr	synonymous_variant	Exon 4 of 13	5		ENSP00000406735.3
KCNQ4	ENST00000506017.1	n.39C>G		non_coding_transcript_exon_variant	Exon 2 of 11	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461570 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727098

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely benign

Submissions summary: Benign:3

Revision: reviewed by expert panel

Submissions by phenotype

not specified Benign:2

Feb 03, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Thr240Thr in c.720C>G of KCNQ4: This variant is not expected to have clinical significance because it does not alter an amino acid residue and is not located within the splice consensus sequence. -

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nonsyndromic genetic hearing loss Benign:1

Sep 28, 2018

ClinGen Hearing Loss Variant Curation Expert Panel

Significance: Likely benign

Review Status: reviewed by expert panel

Collection Method: curation

The silent p.Thr240= variant in KCNQ4 is not predicted by computational tools to impact splicing (BP7. BP4). The variant is absent from the Genome Aggregation Database (http://gnomad.broadinstitute.org), however this is not considered evidence against a likely benign classification. In summary, this variant meets criteria to be classified as likely benign. ACMG/AMP criteria applied: BP7, BP4. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.36
CADD	Benign	9.8
DANN	Benign	0.68

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

Other links and lift over

dbSNP: rs752131356; hg19: chr1-41285030;