rs561255614

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_020822.3(KCNT1):c.3317G>A(p.Arg1106Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000169 in 1,593,924 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: 𝑓 0.00023 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00016 ( 0 hom. )

Consequence

KCNT1
NM_020822.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:10

Conservation

PhyloP100: 9.18

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.029143155).

BP6

Variant 9-135786336-G-A is Benign according to our data. Variant chr9-135786336-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 279821.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00023 (35/152248) while in subpopulation EAS AF= 0.00503 (26/5164). AF 95% confidence interval is 0.00353. There are 0 homozygotes in gnomad4. There are 18 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High AC in GnomAd4 at 35 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3 link	c.3317G>A	p.Arg1106Gln	missense_variant	Exon 29 of 31	ENST00000371757.7	NP_065873.2	Q5JUK3-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNT1	ENST00000371757.7 link	c.3317G>A	p.Arg1106Gln	missense_variant	Exon 29 of 31	1	NM_020822.3	ENSP00000360822.2		Q5JUK3-3

Frequencies

GnomAD3 genomes

AF:

0.000230

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00502

Gnomad SAS

AF:

0.00124

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000388

AC:

AN:

198616

Hom.:

AF XY:

0.000337

AC XY:

AN XY:

109752

show subpopulations

Gnomad AFR exome

AF:

0.0000960

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00414

Gnomad SAS exome

AF:

0.000329

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000597

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000163

AC:

235

AN:

1441676

Hom.:

Cov.:

AF XY:

0.000169

AC XY:

121

AN XY:

715244

show subpopulations

Gnomad4 AFR exome

AF:

0.0000301

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000391

Gnomad4 EAS exome

AF:

0.00352

Gnomad4 SAS exome

AF:

0.000298

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000526

Gnomad4 OTH exome

AF:

0.000218

GnomAD4 genome

AF:

0.000230

AC:

AN:

152248

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

AN XY:

74446

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00503

Gnomad4 SAS

AF:

0.00124

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000855

Hom.:

Bravo

AF:

0.000246

ExAC

AF:

0.000210

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3476

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

May 27, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 32883383, 30821013, 29870100, 30662450, 26740507, 25339316, 31872048) -

Apr 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNT1: BS1, BS2 -

Developmental and epileptic encephalopathy, 14;C3554306:Autosomal dominant nocturnal frontal lobe epilepsy 5

Benign:2

Oct 11, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Benign:1

Feb 21, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: KCNT1 c.3317G>A (p.Arg1106Gln) results in a conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00039 in 198616 control chromosomes, predominantly at a frequency of 0.0041 within the East Asian subpopulation in the gnomAD database. The observed variant frequency within East Asian control individuals in the gnomAD database exceeds the estimated maximal expected allele frequency for a pathogenic variant in KCNT1 causing Developmental And Epileptic Encephalopathy, 14 phenotype. c.3317G>A has been reported in the literature in at least one individual affected with seizures and syncope, but was also detected in multiple control individuals (Juang_2014). This report does not provide unequivocal conclusions about association of the variant with Developmental And Epileptic Encephalopathy, 14. The following publication has been ascertained in the context of this evaluation (PMID: 25339316). ClinVar contains an entry for this variant (Variation ID: 279821). Based on the evidence outlined above, the variant was classified as likely benign. -

Inborn genetic diseases

Benign:1

Feb 14, 2018

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

KCNT1-related disorder

Benign:1

Aug 24, 2023

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

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). -

Developmental and epileptic encephalopathy, 14

Benign:1

Mar 15, 2022

Genome-Nilou Lab

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Autosomal dominant nocturnal frontal lobe epilepsy 5

Benign:1

Mar 15, 2022

Genome-Nilou Lab

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.23

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.11

.;.;.;.;.;.;.;.;T;.

Eigen

Uncertain

0.65

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

1.0

D;D;D;D;D;D;D;D;D;D

M_CAP

Pathogenic

0.89

MetaRNN

Benign

0.029

T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.43

MutationAssessor

Uncertain

2.3

.;.;.;.;.;.;.;.;M;.

PrimateAI

Uncertain

0.64

PROVEAN

Benign

-1.7

.;.;N;.;.;.;.;.;.;N

REVEL

Pathogenic

0.71

Sift

Pathogenic

0.0

.;.;D;.;.;.;.;.;.;D

Sift4G

Uncertain

0.0040

D;D;D;D;D;D;D;D;D;D

Vest4

0.91

MVP

0.58

MPC

0.48

ClinPred

0.11

GERP RS

4.8

Varity_R

0.30

gMVP

0.55

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over