rs796052663

Variant names:

• chr20-63446799-AAC-A
• rs796052663
• NM_172107.4:c.333_334delGT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_172107.4(KCNQ2):​c.333_334delGT​(p.Ser113HisfsTer6) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNQ2 NM_172107.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 7.13

Genes affected

KCNQ2 (HGNC:6296): (potassium voltage-gated channel subfamily Q member 2) The M channel is a slowly activating and deactivating potassium channel that plays a critical role in the regulation of neuronal excitability. The M channel is formed by the association of the protein encoded by this gene and a related protein encoded by the KCNQ3 gene, both integral membrane proteins. M channel currents are inhibited by M1 muscarinic acetylcholine receptors and activated by retigabine, a novel anti-convulsant drug. Defects in this gene are a cause of benign familial neonatal convulsions type 1 (BFNC), also known as epilepsy, benign neonatal type 1 (EBN1). At least five transcript variants encoding five different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 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 20-63446799-AAC-A is Pathogenic according to our data. Variant chr20-63446799-AAC-A is described in ClinVar as [Pathogenic]. Clinvar id is 205940.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr20-63446799-AAC-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNQ2	NM_172107.4	c.333_334delGT	p.Ser113HisfsTer6	frameshift_variant	Exon 2 of 17	ENST00000359125.7	NP_742105.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNQ2	ENST00000359125.7	c.333_334delGT	p.Ser113HisfsTer6	frameshift_variant	Exon 2 of 17	1	NM_172107.4	ENSP00000352035.2

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:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Early infantile epileptic encephalopathy with suppression bursts Pathogenic:1

Oct 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Ser113Hisfs*6) in the KCNQ2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in KCNQ2 are known to be pathogenic (PMID: 14534157, 23692823, 27779742). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with benign familial neonatal-infantile seizures (PMID: 27888506). For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

Apr 22, 2014

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

c.333_334delGT: p.Ser113HisfsX6 (S113Hfsx6) in exon 2 of the KCNQ2 gene (NM_172107.2).The normal sequence with the bases that are deleted in braces is: CTGT{GT}TTTC.The c.333_334delGT mutation in the KCNQ2 gene causes a frameshift starting with codon Serine 113, changes this amino acid to a Hisitine residue and creates a premature Stop codon at position 6 of the new reading frame, denoted p.Ser113HisfsX6. This mutation is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. Although this mutation has not been previously reported to our knowledge, many other frameshift mutations have been published in association with benign familial neonatal seizures or epileptic encephalopathy. The variant is found in INFANT-EPI panel(s). -

Seizures, benign familial neonatal, 1 Other:1

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GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

BFNE (benign familial neonatal epilepsy) -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs796052663; hg19: chr20-62078152;