chr9-135786314-C-T

Variant names:

Variant summary

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

The NM_020822.3(KCNT1):c.3295C>T(p.Pro1099Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00753 in 1,600,666 control chromosomes in the GnomAD database, including 62 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0047 ( 2 hom., cov: 33)

Exomes 𝑓: 0.0078 ( 60 hom. )

Consequence

KCNT1
NM_020822.3 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 4.25

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=0.0038593113).

BP6

Variant 9-135786314-C-T is Benign according to our data. Variant chr9-135786314-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 129362.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-135786314-C-T is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00475 (723/152268) while in subpopulation NFE AF= 0.0085 (578/67988). AF 95% confidence interval is 0.00793. There are 2 homozygotes in gnomad4. There are 334 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High AC in GnomAd4 at 723 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3 link	c.3295C>T	p.Pro1099Ser	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.3295C>T	p.Pro1099Ser	missense_variant	Exon 29 of 31	1	NM_020822.3	ENSP00000360822.2		Q5JUK3-3

Frequencies

GnomAD3 genomes

AF:

0.00475

AC:

723

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00186

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

Gnomad ASJ

AF:

0.00692

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00145

Gnomad FIN

AF:

0.00179

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00850

Gnomad OTH

AF:

0.00287

GnomAD3 exomes

AF:

0.00432

AC:

903

AN:

208826

Hom.:

AF XY:

0.00431

AC XY:

498

AN XY:

115428

show subpopulations

Gnomad AFR exome

AF:

0.00169

Gnomad AMR exome

AF:

0.000508

Gnomad ASJ exome

AF:

0.00477

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00136

Gnomad FIN exome

AF:

0.00174

Gnomad NFE exome

AF:

0.00819

Gnomad OTH exome

AF:

0.00420

GnomAD4 exome

AF:

0.00783

AC:

11335

AN:

1448398

Hom.:

Cov.:

AF XY:

0.00759

AC XY:

5463

AN XY:

719362

show subpopulations

Gnomad4 AFR exome

AF:

0.00105

Gnomad4 AMR exome

AF:

0.000538

Gnomad4 ASJ exome

AF:

0.00435

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00149

Gnomad4 FIN exome

AF:

0.00237

Gnomad4 NFE exome

AF:

0.00961

Gnomad4 OTH exome

AF:

0.00465

GnomAD4 genome

AF:

0.00475

AC:

723

AN:

152268

Hom.:

Cov.:

AF XY:

0.00449

AC XY:

334

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.00185

Gnomad4 AMR

AF:

0.000784

Gnomad4 ASJ

AF:

0.00692

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00145

Gnomad4 FIN

AF:

0.00179

Gnomad4 NFE

AF:

0.00850

Gnomad4 OTH

AF:

0.00284

Alfa

AF:

0.00526

Hom.:

Bravo

AF:

0.00454

TwinsUK

AF:

0.0108

AC:

ALSPAC

AF:

0.0117

AC:

ESP6500AA

AF:

0.00131

AC:

ESP6500EA

AF:

0.00571

AC:

ExAC

AF:

0.00428

AC:

495

Asia WGS

AF:

0.00115

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:6

Dec 15, 2014

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 29, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Aug 07, 2014

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:4

Jan 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

KCNT1: BP4, BS1, BS2 -

May 02, 2019

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 12, 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

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

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

Benign:2

Jul 30, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Benign:1

Oct 12, 2016

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as 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. -

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

0.067

BayesDel_addAF

Benign

-0.66

BayesDel_noAF

Benign

-0.71

CADD

Benign

DANN

Benign

0.76

DEOGEN2

Benign

0.023

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

Eigen

Benign

-0.77

Eigen_PC

Benign

-0.69

FATHMM_MKL

Uncertain

0.95

LIST_S2

Benign

0.81

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

MetaRNN

Benign

0.0039

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

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.90

.;.;.;.;.;.;.;.;L;.

PrimateAI

Benign

0.45

PROVEAN

Benign

0.12

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

REVEL

Benign

0.056

Sift

Benign

0.63

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

Sift4G

Benign

1.0

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

Vest4

0.17

MVP

0.31

MPC

0.090

ClinPred

0.0052

GERP RS

2.8

Varity_R

0.052

gMVP

0.35

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

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