chr1-40784200-CG-C

Variant names:

• chr1-40784200-CG-C
• NM_004700.4:c.110delG

Variant summary

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

The NM_004700.4(KCNQ4):​c.110delG​(p.Gly37AlafsTer102) 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 Lovd as Likely pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KCNQ4 NM_004700.4 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.66

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 1-40784200-CG-C is Pathogenic according to our data. Variant chr1-40784200-CG-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ4	NM_004700.4	c.110delG	p.Gly37AlafsTer102	frameshift_variant	Exon 1 of 14	ENST00000347132.10	NP_004691.2
KCNQ4	NM_172163.3	c.110delG	p.Gly37AlafsTer102	frameshift_variant	Exon 1 of 13		NP_751895.1
KCNQ4	XM_047434057.1	c.110delG	p.Gly37AlafsTer102	frameshift_variant	Exon 1 of 13		XP_047290013.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ4	ENST00000347132.10	c.110delG	p.Gly37AlafsTer102	frameshift_variant	Exon 1 of 14	1	NM_004700.4	ENSP00000262916.6
KCNQ4	ENST00000509682.6	c.110delG	p.Gly37AlafsTer102	frameshift_variant	Exon 1 of 13	5		ENSP00000423756.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 971508 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 464262

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.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-41249872;