Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The ENST00000302127.5(KCND3):c.669G>C(p.Ser223Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.019 in 1,613,706 control chromosomes in the GnomAD database, including 348 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. S223S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.015 ( 28 hom., cov: 31)

Exomes 𝑓: 0.019 ( 320 hom. )

Consequence

KCND3
ENST00000302127.5 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: -2.69

Publications

2 publications found

Variant links:

Genes affected

KCND3 (HGNC:6239): (potassium voltage-gated channel subfamily D member 3) Voltage-gated potassium (Kv) 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. Four sequence-related potassium channel genes - shaker, shaw, shab, and shal - have been identified in Drosophila, and each has been shown to have human homolog(s). This gene encodes a member of the potassium channel, voltage-gated, shal-related subfamily, members of which form voltage-activated A-type potassium ion channels and are prominent in the repolarization phase of the action potential. This member includes two isoforms with different sizes, which are encoded by alternatively spliced transcript variants of this gene. [provided by RefSeq, Jul 2008]

KCND3 Gene-Disease associations (from GenCC):

neurodevelopmental disorder
Inheritance: AD Classification: STRONG Submitted by: G2P
spinocerebellar ataxia type 19/22
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet, Ambry Genetics
Brugada syndrome 9
Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
Brugada syndrome 1
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

KCND3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.64).

BP6

Variant 1-111982058-C-G is Benign according to our data. Variant chr1-111982058-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 240084.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-2.69 with no splicing effect.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.015 (2283/152018) while in subpopulation NFE AF = 0.0227 (1545/67968). AF 95% confidence interval is 0.0218. There are 28 homozygotes in GnomAd4. There are 1098 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check.

BS2

High AC in GnomAd4 at 2283 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000302127.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
KCND3	NM_001378969.1	MANE Select	c.669G>C	p.Ser223Ser	synonymous	Exon 2 of 8	NP_001365898.1
KCND3	NM_004980.5		c.669G>C	p.Ser223Ser	synonymous	Exon 2 of 8	NP_004971.2
KCND3	NM_001378970.1		c.669G>C	p.Ser223Ser	synonymous	Exon 2 of 7	NP_001365899.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
KCND3	ENST00000302127.5	TSL:5 MANE Select	c.669G>C	p.Ser223Ser	synonymous	Exon 2 of 8	ENSP00000306923.4
KCND3	ENST00000315987.6	TSL:1	c.669G>C	p.Ser223Ser	synonymous	Exon 2 of 8	ENSP00000319591.2
KCND3	ENST00000369697.5	TSL:1	c.669G>C	p.Ser223Ser	synonymous	Exon 1 of 6	ENSP00000358711.1

Frequencies

GnomAD3 genomes

AF:

0.0150

AC:

2283

AN:

151900

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00360

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0175

Gnomad ASJ

AF:

0.00173

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00104

Gnomad FIN

AF:

0.0265

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0227

Gnomad OTH

AF:

0.0144

GnomAD2 exomes

AF:

0.0138

AC:

3464

AN:

250146

AF XY:

0.0136

show subpopulations

Gnomad AFR exome

AF:

0.00254

Gnomad AMR exome

AF:

0.00952

Gnomad ASJ exome

AF:

0.00120

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0252

Gnomad NFE exome

AF:

0.0214

Gnomad OTH exome

AF:

0.0154

GnomAD4 exome

AF:

0.0194

AC:

28419

AN:

1461688

Hom.:

320

Cov.:

AF XY:

0.0190

AC XY:

13846

AN XY:

727158

show subpopulations

African (AFR)

AF:

0.00335

AC:

112

AN:

33480

American (AMR)

AF:

0.0100

AC:

447

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.000880

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00139

AC:

120

AN:

86252

European-Finnish (FIN)

AF:

0.0259

AC:

1381

AN:

53254

Middle Eastern (MID)

AF:

0.00139

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0228

AC:

25304

AN:

1112000

Other (OTH)

AF:

0.0170

AC:

1024

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

1834

3668

5502

7336

9170

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

926

1852

2778

3704

4630

<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:

0.0150

AC:

2283

AN:

152018

Hom.:

Cov.:

AF XY:

0.0148

AC XY:

1098

AN XY:

74264

show subpopulations

African (AFR)

AF:

0.00359

AC:

149

AN:

41492

American (AMR)

AF:

0.0175

AC:

267

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00173

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5088

South Asian (SAS)

AF:

0.00104

AC:

AN:

4804

European-Finnish (FIN)

AF:

0.0265

AC:

281

AN:

10588

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0227

AC:

1545

AN:

67968

Other (OTH)

AF:

0.0142

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.521

Heterozygous variant carriers

111

222

332

443

554

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

112

140

<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:

0.0153

Hom.:

Bravo

AF:

0.0131

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.0194

EpiControl

AF:

0.0184

ClinVar

ClinVar submissions as Germline

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

Cardiovascular phenotype (1)

not provided (1)

Spinocerebellar ataxia type 19/22 (1)

Spinocerebellar ataxia type 19/22;C4225340:Brugada syndrome 9 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.64

CADD

Benign

2.4

(source)

DANN

Benign

0.86

PhyloP100

-2.7

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over