rs141281093

Positions:

chr9-135771015-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_020822.3(KCNT1):c.1928G>A(p.Arg643Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000175 in 1,613,664 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

KCNT1
NM_020822.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 2.94

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:

KCNT1 (HGNC:):

KCNT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0140633285).

BP6

Variant 9-135771015-G-A is Benign according to our data. Variant chr9-135771015-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 386260.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1, Benign=1}.

BS2

High AC in GnomAd4 at 34 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCNT1	NM_020822.3 linkuse as main transcript	c.1928G>A	p.Arg643Gln	missense_variant	18/31	ENST00000371757.7	NP_065873.2	Q5JUK3-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCNT1	ENST00000371757.7 linkuse as main transcript	c.1928G>A	p.Arg643Gln	missense_variant	18/31	1	NM_020822.3	ENSP00000360822.2		Q5JUK3-3

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00173

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000233

AC:

AN:

248562

Hom.:

AF XY:

0.000200

AC XY:

AN XY:

134804

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00180

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000658

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000276

Gnomad OTH exome

AF:

0.000330

GnomAD4 exome

AF:

0.000170

AC:

248

AN:

1461346

Hom.:

Cov.:

AF XY:

0.000172

AC XY:

125

AN XY:

726934

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00153

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000929

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000149

Gnomad4 OTH exome

AF:

0.000248

GnomAD4 genome

AF:

0.000223

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.000216

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00173

Gnomad4 EAS

AF:

0.000194

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000363

Hom.:

Bravo

AF:

0.000272

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000297

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000416

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 01, 2021	This variant is associated with the following publications: (PMID: 28166811) -
Uncertain significance, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -
Benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2024	KCNT1: BP4, BS1, BS2 -

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 30, 2024

- -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 10, 2022

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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.056

BayesDel_addAF

Benign

-0.55

BayesDel_noAF

Benign

-0.72

CADD

Benign

DANN

Benign

0.32

DEOGEN2

Benign

0.022

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

Eigen

Benign

-1.1

Eigen_PC

Benign

-0.99

FATHMM_MKL

Benign

0.29

LIST_S2

Uncertain

0.92

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

M_CAP

Uncertain

0.093

MetaRNN

Benign

0.014

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

MetaSVM

Benign

-0.95

MutationAssessor

Benign

-1.1

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

PrimateAI

Benign

0.35

PROVEAN

Benign

0.89

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

REVEL

Benign

0.053

Sift

Benign

1.0

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

Sift4G

Benign

1.0

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

Polyphen

0.0

.;.;.;.;.;.;.;.;B;.

Vest4

0.16

MVP

0.32

MPC

0.73

ClinPred

0.013

GERP RS

0.17

Varity_R

0.026

gMVP

0.20

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

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