19-50320305-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_004977.3(KCNC3):c.2215G>A(p.Gly739Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000042 ( 0 hom., cov: 16)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

KCNC3
NM_004977.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.924

Variant links:

Genes affected

KCNC3 (HGNC:6235): (potassium voltage-gated channel subfamily C member 3) The Shaker gene family of Drosophila encodes components of voltage-gated potassium channels and is comprised of four subfamilies. Based on sequence similarity, this gene is similar to one of these subfamilies, namely the Shaw subfamily. The protein encoded by this gene belongs to the delayed rectifier class of channel proteins and is an integral membrane protein that mediates the voltage-dependent potassium ion permeability of excitable membranes. Alternate splicing results in several transcript variants. [provided by RefSeq, Mar 2014]

KCNC3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.14472213).

BS1

Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.00000886 (7/789718) while in subpopulation AMR AF= 0.000189 (3/15844). AF 95% confidence interval is 0.000051. There are 0 homozygotes in gnomad4_exome. There are 4 alleles in male gnomad4_exome subpopulation. Median coverage is 11. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNC3	NM_004977.3 link	c.2215G>A	p.Gly739Ser	missense_variant	Exon 4 of 5	ENST00000477616.2	NP_004968.2	Q14003
KCNC3	NM_001372305.1 link	c.1987G>A	p.Gly663Ser	missense_variant	Exon 4 of 5		NP_001359234.1
KCNC3	NR_110912.2 link	n.260+288G>A		intron_variant	Intron 2 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNC3	ENST00000477616.2 link	c.2215G>A	p.Gly739Ser	missense_variant	Exon 4 of 5	1	NM_004977.3	ENSP00000434241.1	Q14003
KCNC3	ENST00000670667.1 link	c.2170+288G>A		intron_variant	Intron 3 of 3			ENSP00000499301.1	A0A590UJ62
KCNC3	ENST00000376959.6 link	c.2170+288G>A		intron_variant	Intron 3 of 4	5		ENSP00000366158.2	E7ETH1
KCNC3	ENST00000474951.1 link	c.118+288G>A		intron_variant	Intron 2 of 3	2		ENSP00000432438.1	E9PQY4

Frequencies

GnomAD3 genomes

AF:

0.0000417

AC:

AN:

119910

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000211

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:

0.0000495

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000405

AC:

AN:

49352

Hom.:

AF XY:

0.0000394

AC XY:

AN XY:

25400

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000262

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS 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:

0.00000886

AC:

AN:

789718

Hom.:

Cov.:

AF XY:

0.0000103

AC XY:

AN XY:

387758

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000189

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000664

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000417

AC:

AN:

119922

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

55794

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000210

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000495

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000843

Hom.:

ExAC

AF:

0.0000138

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Apr 12, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2215G>A (p.G739S) alteration is located in exon 4 (coding exon 4) of the KCNC3 gene. This alteration results from a G to A substitution at nucleotide position 2215, causing the glycine (G) at amino acid position 739 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.099

BayesDel_addAF

Benign

-0.088

BayesDel_noAF

Uncertain

-0.070

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.080

Eigen

Benign

-0.67

Eigen_PC

Benign

-0.54

FATHMM_MKL

Benign

0.57

LIST_S2

Benign

0.57

M_CAP

Pathogenic

0.56

MetaRNN

Benign

0.14

MetaSVM

Uncertain

-0.021

MutationAssessor

Benign

0.0

PrimateAI

Pathogenic

0.89

PROVEAN

Benign

0.36

REVEL

Uncertain

0.44

Sift

Benign

0.088

Sift4G

Benign

0.33

Polyphen

0.17

Vest4

0.26

MutPred

0.063

Gain of phosphorylation at G739 (P = 0.0162);

MVP

0.82

ClinPred

0.066

GERP RS

1.3

Varity_R

0.072

gMVP

0.20

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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