rs794729197
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PM4_SupportingPP3PP5
The NM_172107.4(KCNQ2):c.698_699insACC(p.Val233_Thr234insPro) variant causes a inframe insertion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. V233V) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 29)
Consequence
KCNQ2
NM_172107.4 inframe_insertion
NM_172107.4 inframe_insertion
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 9.11
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 Likely_pathogenic. Variant got 7 ACMG points.
PM1
?
In a hotspot region, there are 15 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_172107.4
PM2
?
Very rare variant in population databases, with high coverage;
PM4
?
Nonframeshift variant in NON repetitive region in NM_172107.4. Strenght limited to Supporting due to length of the change: 1aa.
PP3
?
No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
PP5
?
Variant 20-63442523-G-GGGT is Pathogenic according to our data. Variant chr20-63442523-G-GGGT is described in ClinVar as [Pathogenic]. Clinvar id is 202170.Status of the report is no_assertion_criteria_provided, 0 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KCNQ2 | NM_172107.4 | c.698_699insACC | p.Val233_Thr234insPro | inframe_insertion | 5/17 | ENST00000359125.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KCNQ2 | ENST00000359125.7 | c.698_699insACC | p.Val233_Thr234insPro | inframe_insertion | 5/17 | 1 | NM_172107.4 | A1 |
Frequencies
GnomAD3 genomes ? Cov.: 29
GnomAD3 genomes
?
Cov.:
29
GnomAD4 exome Cov.: 33
GnomAD4 exome
Cov.:
33
GnomAD4 genome ? Cov.: 29
GnomAD4 genome
?
Cov.:
29
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: no assertion criteria provided
LINK: link
Submissions by phenotype
Developmental and epileptic encephalopathy, 7 Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | Mendelics | May 13, 2016 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at