rs755694160
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Variant summary
Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2
The NM_020822.3(KCNT1):c.3664C>T(p.Leu1222=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000117 in 1,453,522 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Genomes: not found (cov: 33)
Exomes 𝑓: 0.000012 ( 0 hom. )
Consequence
KCNT1
NM_020822.3 synonymous
NM_020822.3 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: 1.11
Genes affected
KCNT1 (HGNC:18865): (potassium sodium-activated channel subfamily T member 1) Potassium channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. This gene encodes a sodium-activated potassium channel subunit which is thought to function in ion conductance and developmental signaling pathways. Mutations in this gene cause the early-onset epileptic disorders, malignant migrating partial seizures of infancy and autosomal dominant nocturnal frontal lobe epilepsy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2012]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -17 ACMG points.
BP4
?
Computational evidence support a benign effect (BayesDel_noAF=-0.5).
BP6
?
Variant 9-135792117-C-T is Benign according to our data. Variant chr9-135792117-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 473395.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
BP7
?
Synonymous conserved (PhyloP=1.11 with no splicing effect.
BS2
?
High AC in GnomAdExome4 at 17 AD gene.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KCNT1 | NM_020822.3 | c.3664C>T | p.Leu1222= | synonymous_variant | 31/31 | ENST00000371757.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KCNT1 | ENST00000371757.7 | c.3664C>T | p.Leu1222= | synonymous_variant | 31/31 | 1 | NM_020822.3 | A2 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
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33
GnomAD3 exomes AF: 0.0000249 AC: 6AN: 240534Hom.: 0 AF XY: 0.0000229 AC XY: 3AN XY: 131272
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GnomAD4 exome AF: 0.0000117 AC: 17AN: 1453522Hom.: 0 Cov.: 32 AF XY: 0.0000111 AC XY: 8AN XY: 723352
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GnomAD4 genome ? Cov.: 33
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ClinVar
Significance: Likely benign
Submissions summary: Benign:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Developmental and epileptic encephalopathy, 14;C3554306:Autosomal dominant nocturnal frontal lobe epilepsy 5 Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Invitae | Jun 02, 2023 | - - |
KCNT1-related disorder Benign:1
Likely benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | Aug 14, 2019 | This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). - |
Computational scores
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Name
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at