NM_020822.3:c.1036-15G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBA1

The NM_020822.3(KCNT1):c.1036-15G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.02 in 1,599,926 control chromosomes in the GnomAD database, including 445 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.025 ( 66 hom., cov: 32)

Exomes 𝑓: 0.019 ( 379 hom. )

Consequence

KCNT1
NM_020822.3 intron

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: -1.27

Publications

1 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 -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.86).

BP6

Variant 9-135765016-G-A is Benign according to our data. Variant chr9-135765016-G-A is described in ClinVar as Benign. ClinVar VariationId is 261360.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BA1

GnomAdExome4 highest subpopulation (MID) allele frequency at 95% confidence interval = 0.0647 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3 link	c.1036-15G>A		intron_variant	Intron 11 of 30	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.1036-15G>A		intron_variant	Intron 11 of 30	1	NM_020822.3	ENSP00000360822.2		Q5JUK3-3

Frequencies

GnomAD3 genomes

AF:

0.0250

AC:

3807

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0366

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0335

Gnomad ASJ

AF:

0.0553

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00785

Gnomad FIN

AF:

0.00122

Gnomad MID

AF:

0.111

Gnomad NFE

AF:

0.0209

Gnomad OTH

AF:

0.0378

GnomAD2 exomes

AF:

0.0189

AC:

4661

AN:

246050

AF XY:

0.0187

show subpopulations

Gnomad AFR exome

AF:

0.0382

Gnomad AMR exome

AF:

0.0192

Gnomad ASJ exome

AF:

0.0465

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00336

Gnomad NFE exome

AF:

0.0222

Gnomad OTH exome

AF:

0.0295

GnomAD4 exome

AF:

0.0195

AC:

28170

AN:

1447638

Hom.:

379

Cov.:

AF XY:

0.0193

AC XY:

13842

AN XY:

717150

show subpopulations

African (AFR)

AF:

0.0376

AC:

1248

AN:

33232

American (AMR)

AF:

0.0205

AC:

906

AN:

44290

Ashkenazi Jewish (ASJ)

AF:

0.0495

AC:

1287

AN:

25994

East Asian (EAS)

AF:

0.0000509

AC:

AN:

39326

South Asian (SAS)

AF:

0.00854

AC:

734

AN:

85930

European-Finnish (FIN)

AF:

0.00348

AC:

182

AN:

52274

Middle Eastern (MID)

AF:

0.0703

AC:

403

AN:

5730

European-Non Finnish (NFE)

AF:

0.0199

AC:

21900

AN:

1101174

Other (OTH)

AF:

0.0253

AC:

1508

AN:

59688

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

1288

2577

3865

5154

6442

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

814

1628

2442

3256

4070

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0250

AC:

3807

AN:

152288

Hom.:

Cov.:

AF XY:

0.0241

AC XY:

1798

AN XY:

74464

show subpopulations

African (AFR)

AF:

0.0366

AC:

1522

AN:

41544

American (AMR)

AF:

0.0334

AC:

511

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.0553

AC:

192

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.00765

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00122

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.112

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0209

AC:

1420

AN:

68020

Other (OTH)

AF:

0.0374

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

183

367

550

734

917

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

126

168

210

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0248

Hom.:

Bravo

AF:

0.0279

Asia WGS

AF:

0.00779

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Jan 13, 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. -

PreventionGenetics, part of Exact Sciences

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 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Developmental and epileptic encephalopathy, 14

Benign:1

Mar 15, 2022

Genome-Nilou Lab

Significance: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:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.86

CADD

Benign

0.17

(source)

DANN

Benign

0.52

PhyloP100

-1.3

Mutation Taster

=100/0

polymorphism (auto)

(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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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