rs80358271

Positions:

• chr1-40784303-CCAGCGCTCCTCGG-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_004700.4(KCNQ4):​c.212_224del​(p.Gln71ProfsTer64) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNQ4 NM_004700.4 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 2.79

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 Pathogenic. Variant got 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-40784303-CCAGCGCTCCTCGG-C is Pathogenic according to our data. Variant chr1-40784303-CCAGCGCTCCTCGG-C is described in ClinVar as [Pathogenic]. Clinvar id is 6245.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr1-40784303-CCAGCGCTCCTCGG-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNQ4	NM_004700.4	c.212_224del	p.Gln71ProfsTer64	frameshift_variant	1/14	ENST00000347132.10	NP_004691.2
KCNQ4	NM_172163.3	c.212_224del	p.Gln71ProfsTer64	frameshift_variant	1/13		NP_751895.1
KCNQ4	XM_047434057.1	c.212_224del	p.Gln71ProfsTer64	frameshift_variant	1/13		XP_047290013.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNQ4	ENST00000347132.10	c.212_224del	p.Gln71ProfsTer64	frameshift_variant	1/14	1	NM_004700.4	ENSP00000262916	P2
KCNQ4	ENST00000509682.6	c.212_224del	p.Gln71ProfsTer64	frameshift_variant	1/13	5		ENSP00000423756	A1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Autosomal dominant nonsyndromic hearing loss 2A Pathogenic:1 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 22, 2019	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs80358271; hg19: chr1-41249975;