11-17736496-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001112741.2(KCNC1):c.494C>T(p.Pro165Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000069 in 1,593,748 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000069 ( 0 hom. )

Consequence

KCNC1
NM_001112741.2 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 1.56

Publications

0 publications found

Variant links:

Genes affected

KCNC1 (HGNC:6233): (potassium voltage-gated channel subfamily C member 1) This gene encodes a member of a family of integral membrane proteins that mediate the voltage-dependent potassium ion permeability of excitable membranes. Alternative splicing is thought to result in two transcript variants encoding isoforms that differ at their C-termini. These isoforms have had conflicting names in the literature: the longer isoform has been called both "b" and "alpha", while the shorter isoform has been called both "a" and "beta" (PMIDs 1432046, 12091563). [provided by RefSeq, Oct 2014]

KCNC1 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
progressive myoclonic epilepsy type 7
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, G2P
progressive myoclonus epilepsy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen

KCNC1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.058081985).

BP6

Variant 11-17736496-C-T is Benign according to our data. Variant chr11-17736496-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 475356.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.00000694 (10/1441512) while in subpopulation AMR AF = 0.000185 (8/43274). AF 95% confidence interval is 0.0000912. There are 0 homozygotes in GnomAdExome4. There are 5 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAdExome4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNC1	NM_001112741.2 link	c.494C>T	p.Pro165Leu	missense_variant	Exon 1 of 4	ENST00000265969.8	NP_001106212.1	P48547-2
KCNC1	NM_004976.4 link	c.494C>T	p.Pro165Leu	missense_variant	Exon 1 of 2		NP_004967.1	P48547-1
KCNC1	XM_047426916.1 link	c.494C>T	p.Pro165Leu	missense_variant	Exon 1 of 4		XP_047282872.1
KCNC1	XR_930866.3 link	n.1716C>T		non_coding_transcript_exon_variant	Exon 1 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNC1	ENST00000265969.8 link	c.494C>T	p.Pro165Leu	missense_variant	Exon 1 of 4	5	NM_001112741.2	ENSP00000265969.7		P48547-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.0000335

AC:

AN:

209144

AF XY:

0.0000257

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000216

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000694

AC:

AN:

1441512

Hom.:

Cov.:

AF XY:

0.00000697

AC XY:

AN XY:

716944

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33076

American (AMR)

AF:

0.000185

AC:

AN:

43274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25820

East Asian (EAS)

AF:

0.0000510

AC:

AN:

39248

South Asian (SAS)

AF:

0.00

AC:

AN:

84976

European-Finnish (FIN)

AF:

0.00

AC:

AN:

42246

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5684

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1107438

Other (OTH)

AF:

0.00

AC:

AN:

59750

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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:

0.00000657

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74372

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41468

American (AMR)

AF:

0.00

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68042

Other (OTH)

AF:

0.000478

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000256

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Progressive myoclonic epilepsy type 7

Uncertain:1

Jan 16, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 165 of the KCNC1 protein (p.Pro165Leu). This variant is present in population databases (rs749790557, gnomAD 0.02%). This missense change has been observed in individual(s) with clinical features of KCNC1-related conditions (internal data). ClinVar contains an entry for this variant (Variation ID: 475356). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt KCNC1 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Inborn genetic diseases

Benign:1

Jan 26, 2023

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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.095

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.17

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.13

T;.

Eigen

Benign

-0.44

Eigen_PC

Benign

-0.26

FATHMM_MKL

Benign

0.50

LIST_S2

Uncertain

0.91

D;D

M_CAP

Benign

0.075

MetaRNN

Benign

0.058

T;T

MetaSVM

Uncertain

0.18

MutationAssessor

Benign

0.97

L;L

PhyloP100

1.6

PrimateAI

Benign

0.40

PROVEAN

Benign

-0.87

N;N

REVEL

Uncertain

0.32

Sift

Benign

0.23

T;T

Sift4G

Benign

0.28

T;T

Polyphen

0.0020

B;.

Vest4

0.12

MutPred

0.34

Gain of MoRF binding (P = 0.0334);Gain of MoRF binding (P = 0.0334);

MVP

0.57

MPC

1.5

ClinPred

0.050

GERP RS

5.2

Varity_R

0.18

gMVP

0.80

Mutation Taster

=86/14

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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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