rs113333501

Variant names:

• chr9-135770008-G-A
• rs113333501
• NM_020822.3:c.1572G>A

Your query was ambiguous. Multiple possible variants found:

• chr9-135770008-G-A
• chr9-135770008-G-C

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_020822.3(KCNT1):​c.1572G>A​(p.Pro524Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000491 in 1,404,768 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.000049 (1 hom.)
• Consequence: KCNT1 NM_020822.3 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -3.01
• 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: Benign. The variant received -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 9-135770008-G-A is Benign according to our data. Variant chr9-135770008-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 540559.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-3.01 with no splicing effect.
• BS2: High AC in GnomAdExome4 at 69 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020822.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNT1	NM_020822.3	MANE Select	c.1572G>A	p.Pro524Pro	synonymous	Exon 16 of 31	NP_065873.2
	KCNT1	NM_001272003.2		c.1437G>A	p.Pro479Pro	synonymous	Exon 15 of 31	NP_001258932.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNT1	ENST00000371757.7	TSL:1 MANE Select	c.1572G>A	p.Pro524Pro	synonymous	Exon 16 of 31	ENSP00000360822.2
	KCNT1	ENST00000460750.5	TSL:1	n.*1182G>A		non_coding_transcript_exon	Exon 16 of 32	ENSP00000418777.1
	KCNT1	ENST00000460750.5	TSL:1	n.*1182G>A		3_prime_UTR	Exon 16 of 32	ENSP00000418777.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD2 exomes AF: 0.00000610 AC: 1 AN: 163950 AF XY: 0.0000115

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000155

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000491 AC: 69 AN: 1404768 Hom.: 1 Cov.: 32 AF XY: 0.0000533 AC XY: 37 AN XY: 693588

African (AFR) AF: 0.000251 AC: 8 AN: 31908

American (AMR) AF: 0.00 AC: 0 AN: 36972

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25206

East Asian (EAS) AF: 0.00 AC: 0 AN: 36274

South Asian (SAS) AF: 0.00 AC: 0 AN: 79596

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48814

Middle Eastern (MID) AF: 0.000388 AC: 2 AN: 5154

European-Non Finnish (NFE) AF: 0.0000388 AC: 42 AN: 1082662

Other (OTH) AF: 0.000292 AC: 17 AN: 58182

GnomAD4 genome Cov.: 34

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000264

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	2	not provided (2)
-	-	1	Autosomal dominant nocturnal frontal lobe epilepsy 5 (1)
-	-	1	Developmental and epileptic encephalopathy, 14 (1)
-	-	1	Developmental and epileptic encephalopathy, 14;C3554306:Autosomal dominant nocturnal frontal lobe epilepsy 5 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	12
DANN	Benign	0.92
PhyloP100		-3.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs113333501; hg19: chr9-138661854; COSMIC: COSV104556745; COSMIC: COSV104556745;