rs149804567

Variant names:

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 1P and 20B. PP3BP4_StrongBP6_Very_StrongBS1BS2

The NM_020822.3(KCNT1):c.2543A>G(p.Glu848Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00293 in 1,552,002 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0023 ( 1 hom., cov: 33)

Exomes 𝑓: 0.0030 ( 9 hom. )

Consequence

KCNT1
NM_020822.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:15

Conservation

PhyloP100: 9.00

Publications

10 publications found

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 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

KCNT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -19 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 9: AlphaMissense, BayesDel_noAF, Cadd, Dann, M_CAP, phyloP100way_vertebrate, PROVEAN, REVEL, REVEL [when max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.021965742).

BP6

Variant 9-135778444-A-G is Benign according to our data. Variant chr9-135778444-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 129358.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.00231 (352/152290) while in subpopulation AMR AF = 0.00444 (68/15312). AF 95% confidence interval is 0.00359. There are 1 homozygotes in GnomAd4. There are 182 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High AC in GnomAd4 at 352 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3 link	c.2543A>G	p.Glu848Gly	missense_variant	Exon 22 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.2543A>G	p.Glu848Gly	missense_variant	Exon 22 of 31	1	NM_020822.3	ENSP00000360822.2		Q5JUK3-3

Frequencies

GnomAD3 genomes

AF:

0.00231

AC:

352

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000555

Gnomad AMI

AF:

0.00110

Gnomad AMR

AF:

0.00445

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00103

Gnomad FIN

AF:

0.00103

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.00346

Gnomad OTH

AF:

0.00239

GnomAD2 exomes

AF:

0.00229

AC:

361

AN:

157314

AF XY:

0.00226

show subpopulations

Gnomad AFR exome

AF:

0.000340

Gnomad AMR exome

AF:

0.00391

Gnomad ASJ exome

AF:

0.000352

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00145

Gnomad NFE exome

AF:

0.00329

Gnomad OTH exome

AF:

0.00405

GnomAD4 exome

AF:

0.00300

AC:

4200

AN:

1399712

Hom.:

Cov.:

AF XY:

0.00287

AC XY:

1981

AN XY:

690470

show subpopulations

African (AFR)

AF:

0.000632

AC:

AN:

31628

American (AMR)

AF:

0.00408

AC:

146

AN:

35760

Ashkenazi Jewish (ASJ)

AF:

0.000159

AC:

AN:

25178

East Asian (EAS)

AF:

0.00

AC:

AN:

35792

South Asian (SAS)

AF:

0.000844

AC:

AN:

79366

European-Finnish (FIN)

AF:

0.000798

AC:

AN:

48896

Middle Eastern (MID)

AF:

0.00773

AC:

AN:

5690

European-Non Finnish (NFE)

AF:

0.00343

AC:

3698

AN:

1079374

Other (OTH)

AF:

0.00314

AC:

182

AN:

58028

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.466

Heterozygous variant carriers

229

458

686

915

1144

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00231

AC:

352

AN:

152290

Hom.:

Cov.:

AF XY:

0.00244

AC XY:

182

AN XY:

74468

show subpopulations

African (AFR)

AF:

0.000553

AC:

AN:

41562

American (AMR)

AF:

0.00444

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.000288

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00103

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00103

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.0102

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00346

AC:

235

AN:

68002

Other (OTH)

AF:

0.00236

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00298

Hom.:

Bravo

AF:

0.00235

TwinsUK

AF:

0.00566

AC:

ALSPAC

AF:

0.00389

AC:

ESP6500AA

AF:

0.000942

AC:

ESP6500EA

AF:

0.00288

AC:

ExAC

AF:

0.000843

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:6

Nov 07, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 15, 2019

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

KCNT1: BS1 -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jun 27, 2022

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

See Variant Classification Assertion Criteria. -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

not specified

Benign:4

Feb 20, 2015

Eurofins Ntd Llc (ga)

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 15, 2014

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Developmental and epileptic encephalopathy, 14

Benign:2

May 28, 2019

Mendelics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 15, 2022

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

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

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Benign:1

Feb 20, 2019

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. -

Autosomal dominant nocturnal frontal lobe epilepsy 5

Benign:1

Mar 15, 2022

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.71

BayesDel_addAF

Uncertain

0.033

BayesDel_noAF

Pathogenic

0.28

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.31

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

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.96

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

M_CAP

Pathogenic

0.52

MetaRNN

Benign

0.022

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

MetaSVM

Uncertain

0.067

MutationAssessor

Uncertain

2.3

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

PhyloP100

9.0

PrimateAI

Uncertain

0.69

PROVEAN

Pathogenic

-6.3

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

REVEL

Pathogenic

0.78

Sift

Uncertain

0.0010

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

Sift4G

Uncertain

0.0060

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

Polyphen

0.86

.;.;.;.;.;.;.;.;P;.

Vest4

0.69

MVP

0.86

MPC

1.1

ClinPred

0.029

GERP RS

4.7

Varity_R

0.48

gMVP

0.94

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

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rs149804567

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over