20-63444708-C-G
Position:
Variant summary
Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1PM2PM5PP2PP3_StrongPP5_Moderate
The NM_172107.4(KCNQ2):c.641G>C(p.Arg214Pro) variant causes a missense change. 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 Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R214Q) has been classified as Pathogenic.
Frequency
Genomes: not found (cov: 33)
Consequence
KCNQ2
NM_172107.4 missense
NM_172107.4 missense
Scores
8
6
1
Clinical Significance
Conservation
PhyloP100: 6.02
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.
PM1
In a hotspot region, there are 14 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 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 chr20-63444708-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 578032.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
PP2
Missense variant where missense usually causes diseases, KCNQ2
PP3
MetaRNN computational evidence supports a deleterious effect, 0.957
PP5
Variant 20-63444708-C-G is Pathogenic according to our data. Variant chr20-63444708-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 373698.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.641G>C | p.Arg214Pro | missense_variant | 4/17 | ENST00000359125.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KCNQ2 | ENST00000359125.7 | c.641G>C | p.Arg214Pro | 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: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Dec 06, 2016 | A novel R214P variant that is likely pathogenic has been identified in the KCNQ2 gene. The R214P variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The R214P variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R214P variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a conserved position predicted to be within the Segment S4 voltage-sensor helical transmembrane domain. A different missense variant in the same residue (R214W) as well as multiple missense variants in nearby residues have been reported in the Human Gene Mutation Database in association with KCNQ2-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. In silico analysis predicts this variant is probably damaging to the protein structure/function. Therefore, this variant is likely pathogenic; however, the possibility that it is benign cannot be excluded. - |
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
Uncertain
D
LIST_S2
Pathogenic
D;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;D
MetaSVM
Pathogenic
D
MutationAssessor
Uncertain
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;D
Polyphen
D;.;.;.;.;.;D;.;D;D;.;.
Vest4
MutPred
Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);.;Loss of MoRF binding (P = 0.005);.;Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);Loss of MoRF binding (P = 0.005);.;
MVP
MPC
3.5
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