rs201072665

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_ModerateBP6_Very_StrongBS2

The NM_012281.3(KCND2):c.670C>A(p.Arg224Arg) variant causes a synonymous change. The variant allele was found at a frequency of 0.000785 in 1,613,782 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.00051 ( 2 hom., cov: 31)

Exomes 𝑓: 0.00081 ( 13 hom. )

Consequence

KCND2
NM_012281.3 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 4.04

Publications

0 publications found

Variant links:

Genes affected

KCND2 (HGNC:6238): (potassium voltage-gated channel subfamily D member 2) 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 mediates a rapidly inactivating, A-type outward potassium current which is not under the control of the N terminus as it is in Shaker channels. [provided by RefSeq, Jul 2008]

KCND2 Gene-Disease associations (from GenCC):

KCND2-related neurodevelopmental disorder with or without seizures
Inheritance: AD Classification: MODERATE Submitted by: G2P
complex neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: Illumina

KCND2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.24).

BP6

Variant 7-120275302-C-A is Benign according to our data. Variant chr7-120275302-C-A is described in ClinVar as Benign. ClinVar VariationId is 529732.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS2

High AC in GnomAd4 at 78 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCND2	NM_012281.3 link	c.670C>A	p.Arg224Arg	synonymous_variant	Exon 1 of 6	ENST00000331113.9	NP_036413.1
KCND2	XM_047420346.1 link	c.670C>A	p.Arg224Arg	synonymous_variant	Exon 2 of 7		XP_047276302.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCND2	ENST00000331113.9 link	c.670C>A	p.Arg224Arg	synonymous_variant	Exon 1 of 6	1	NM_012281.3	ENSP00000333496.4

Frequencies

GnomAD3 genomes

AF:

0.000514

AC:

AN:

151790

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000726

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000722

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000195

Gnomad SAS

AF:

0.00980

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000221

Gnomad OTH

AF:

0.000479

GnomAD2 exomes

AF:

0.00138

AC:

347

AN:

251430

AF XY:

0.00197

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000158

Gnomad OTH exome

AF:

0.000977

GnomAD4 exome

AF:

0.000813

AC:

1189

AN:

1461874

Hom.:

Cov.:

AF XY:

0.00118

AC XY:

858

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.0000894

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0110

AC:

946

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53408

Middle Eastern (MID)

AF:

0.00277

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000152

AC:

169

AN:

1112004

Other (OTH)

AF:

0.000729

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.459

Heterozygous variant carriers

168

253

337

421

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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:

0.000513

AC:

AN:

151908

Hom.:

Cov.:

AF XY:

0.000754

AC XY:

AN XY:

74246

show subpopulations

African (AFR)

AF:

0.0000724

AC:

AN:

41428

American (AMR)

AF:

0.000721

AC:

AN:

15264

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000196

AC:

AN:

5110

South Asian (SAS)

AF:

0.00980

AC:

AN:

4794

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10570

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000221

AC:

AN:

67960

Other (OTH)

AF:

0.000474

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.000313

Hom.:

Bravo

AF:

0.000242

Asia WGS

AF:

0.00231

AC:

AN:

3478

EpiCase

AF:

0.000436

EpiControl

AF:

0.000178

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Jan 27, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: KCND2 c.670C>A alters a conserved nucleotide resulting in a synonymous change. Several computational tools predict a significant impact on normal splicing: Four predict the variant abolishes a cryptic 5' donor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.0014 in 251430 control chromosomes in the gnomAD database, including 6 homozygotes. The observed variant frequency is approximately 221 fold of the estimated maximal expected allele frequency for a pathogenic variant in KCND2 causing Arrhythmia phenotype (6.3e-06). To our knowledge, no occurrence of c.670C>A in individuals affected with Arrhythmia and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 529732). Based on the evidence outlined above, the variant was classified as benign. -

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Early myoclonic encephalopathy

Benign:1

Jan 22, 2025

Labcorp Genetics (formerly Invitae), Labcorp

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

-0.24

CADD

Benign

(source)

DANN

Benign

0.59

PhyloP100

4.0

Mutation Taster

=94/6

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

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