rs1057516096

Positions:

• chr20-63439690-C-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5

The NM_172107.4(KCNQ2):​c.835G>T​(p.Gly279Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G279D) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KCNQ2 NM_172107.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1 O:2
• Conservation: PhyloP100: 7.73

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 12 ACMG points.

• PM1: In a hotspot region, there are 14 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_172107.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr20-63439690-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1805714.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, KCNQ2
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant 20-63439690-C-A is Pathogenic according to our data. Variant chr20-63439690-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 369765.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1, not_provided=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCNQ2	NM_172107.4	c.835G>T	p.Gly279Cys	missense_variant	6/17	ENST00000359125.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCNQ2	ENST00000359125.7	c.835G>T	p.Gly279Cys	missense_variant	6/17	1	NM_172107.4	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1 Other:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

KCNQ2-related disorder Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Sep 01, 2023

Variant summary: KCNQ2 c.835G>T (p.Gly279Cys) results in a non-conservative amino acid change located in the Ion transport domain (IPR005821) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 250870 control chromosomes (gnomAD). c.835G>T has been reported in the literature in at least one individuals affected with KCNQ2-Related Disorders (e.g. Milh_2015). This report does not provide unequivocal conclusions about association of the variant with KCNQ2-Related Disorders. Automated patch clamp assays showed the variant had 4.8% peak current density relative to WT in transfected CHO cells stably expressing KCNQ3 (Vanoye_2022). The following publications have been ascertained in the context of this evaluation (PMID: 25959266, 35104249). One ClinVar submitter has assessed the variant since 2014, and classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 20, 2018

The p.G279C variant (also known as c.835G>T), located in coding exon 6 of the KCNQ2 gene, results from a G to T substitution at nucleotide position 835. The glycine at codon 279 is replaced by cysteine, an amino acid with highly dissimilar properties. This variant was identified in one individual in a cohort of individuals with recurrent seizures prior to one month of age, a normal metabolic profile, and a normal brain MRI (Milh M et al. Am. J. Med. Genet. A, 2015 Oct;167A:2314-8). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on available evidence to date, the clinical significance of this alteration remains unclear. -

Complex neurodevelopmental disorder Other:1

not provided, no classification provided

literature only

Channelopathy-Associated Epilepsy Research Center

-

- -

Developmental and epileptic encephalopathy, 7 Other:1

not provided, no classification provided

literature only

GeneReviews

-

EE (epileptic encephalopathy) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	32
DANN	Uncertain	1.0
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Pathogenic	4.8	H;.;.;.;.;.;H;.;H;H;H
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.90	D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;.;D;D;D;D;D
Polyphen		1.0	D;.;.;.;.;.;D;.;D;D;.
Vest4		0.99
MutPred		0.87		Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);.;Loss of ubiquitination at K283 (P = 0.0661);.;Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);Loss of ubiquitination at K283 (P = 0.0661);
MVP		1.0
MPC		2.9
ClinPred		1.0	D
GERP RS		4.0
Varity_R		0.97
gMVP		1.0

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: rs1057516096; hg19: chr20-62071043;