rs1057516082
Variant summary
Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PS1PM1PM2PP2PP3_ModeratePP5_Moderate
The NM_172107.4(KCNQ2):c.523G>C(p.Val175Leu) 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. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin ClinVar.
Frequency
Genomes: not found (cov: 33)
Consequence
KCNQ2
NM_172107.4 missense
NM_172107.4 missense
Scores
9
5
1
Clinical Significance
Conservation
PhyloP100: 7.66
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 13 ACMG points.
PS1
?
Transcript NM_172107.4 (KCNQ2) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 2138369
PM1
?
In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_172107.4
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, KCNQ2
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.897
PP5
?
Variant 20-63444826-C-G is Pathogenic according to our data. Variant chr20-63444826-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 369748.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KCNQ2 | NM_172107.4 | c.523G>C | p.Val175Leu | missense_variant | 4/17 | ENST00000359125.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KCNQ2 | ENST00000359125.7 | c.523G>C | p.Val175Leu | missense_variant | 4/17 | 1 | NM_172107.4 | A1 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 33
GnomAD4 genome
?
Cov.:
33
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1Other:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | May 29, 2018 | This V175L variant in this individual has been reported as a de novo change in association with myoclonic epilepsy which progressed to West syndrome (Samanta et al., 2015). The V175L variant is not observed in large population cohorts (Lek et al., 2016). This variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. However, in-silico analyses, including protein predictors and evolutionary conservation, support a deleterious effect. A different nucleotide substitution resulting in the same amino acid change (c.523 G>T) has been reported as a de novo variant in an individual with early onset epileptic encephalopathy (Milh et al., 2013). The V175L variant is predicted to be within the transmembrane segment S3. - |
Developmental and epileptic encephalopathy, 7 Other:1
not provided, no classification provided | literature only | GeneReviews | - | Infantile spasms - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D;D;D;D;D;D;D;D;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D;D;D;D;D;D;D;D
MetaSVM
Pathogenic
D
MutationAssessor
Pathogenic
M;.;.;.;.;.;M;.;M;M;M
MutationTaster
Benign
D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI
Pathogenic
D
Sift4G
Uncertain
D;D;D;D;D;.;D;D;D;D;D
Polyphen
P;.;.;.;.;.;D;.;P;P;.
Vest4
MutPred
Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);.;Gain of catalytic residue at V175 (P = 0.12);.;Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);Gain of catalytic residue at V175 (P = 0.12);
MVP
MPC
2.3
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at