rs757968008

Variant names:

• chr9-135786170-CGCCCTGCCCTGCCCT-C
• rs757968008
• NM_020822.3:c.3178-17_3178-3delTGCCCTGCCCTGCCC

Your query was ambiguous. Multiple possible variants found:

• chr9-135786170-CGCCCTGCCCTGCCCT-C
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCT
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCTGCCCT
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCTGCCCTGCCCTGCCCT
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCTGCCCTGCCCTGCCCTGCCCT
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCTGCCCTGCCCTGCCCTGCCCTGCCCT
• chr9-135786170-CGCCCTGCCCTGCCCT-CGCCCTGCCCTGCCCTGCCCTGCCCTGCCCTGCCCT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_020822.3(KCNT1):​c.3178-17_3178-3delTGCCCTGCCCTGCCC variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000715 in 1,397,654 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 0)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: KCNT1 NM_020822.3 splice_region, intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.02
• Publications: 0 publications found

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]

KCNT1 Gene-Disease associations (from GenCC):

• childhood-onset epilepsy syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• developmental and epileptic encephalopathy, 14

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• malignant migrating partial seizures of infancy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• autosomal dominant nocturnal frontal lobe epilepsy 5

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• autosomal dominant nocturnal frontal lobe epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3	c.3178-17_3178-3delTGCCCTGCCCTGCCC		splice_region_variant, intron_variant	Intron 28 of 30	ENST00000371757.7	NP_065873.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNT1	ENST00000371757.7	c.3178-17_3178-3delTGCCCTGCCCTGCCC		splice_region_variant, intron_variant	Intron 28 of 30	1	NM_020822.3	ENSP00000360822.2

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome AF: 7.15e-7 AC: 1 AN: 1397654 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 696472

African (AFR) AF: 0.00 AC: 0 AN: 30560

American (AMR) AF: 0.00 AC: 0 AN: 38860

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25146

East Asian (EAS) AF: 0.00 AC: 0 AN: 38614

South Asian (SAS) AF: 0.00 AC: 0 AN: 81936

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50462

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5596

European-Non Finnish (NFE) AF: 9.36e-7 AC: 1 AN: 1068486

Other (OTH) AF: 0.00 AC: 0 AN: 57994

GnomAD4 genome Cov.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs757968008; hg19: chr9-138678016;