rs150401343

Positions:

• chr1-111780713-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_001378969.1(KCND3):​c.1348C>T​(p.Leu450Phe) variant causes a missense change. The variant allele was found at a frequency of 0.0000912 in 1,612,072 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000072 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000093 (0 hom.)
• Consequence: KCND3 NM_001378969.1 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:3 B:4
• Conservation: PhyloP100: 4.93

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 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KCND3. . Gene score misZ 3.8545 (greater than the threshold 3.09). Trascript score misZ 4.8782 (greater than threshold 3.09). GenCC has associacion of gene with spinocerebellar ataxia type 19/22, Brugada syndrome 1, Brugada syndrome 9.
• BP4: Computational evidence support a benign effect (MetaRNN=0.21874768).
• BS2: High AC in GnomAd4 at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCND3	NM_001378969.1	c.1348C>T	p.Leu450Phe	missense_variant	4/8	ENST00000302127.5	NP_001365898.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCND3	ENST00000302127.5	c.1348C>T	p.Leu450Phe	missense_variant	4/8	5	NM_001378969.1	ENSP00000306923.4
KCND3	ENST00000315987.6	c.1348C>T	p.Leu450Phe	missense_variant	4/8	1		ENSP00000319591.2
KCND3	ENST00000369697.5	c.1348C>T	p.Leu450Phe	missense_variant	3/6	1		ENSP00000358711.1
KCND3	ENST00000703640.1	n.2039C>T		non_coding_transcript_exon_variant	1/3

Frequencies

GnomAD3 genomes AF: 0.0000723 AC: 11 AN: 152230 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000133 AC: 33 AN: 247646 Hom.: 0 AF XY: 0.000157 AC XY: 21 AN XY: 133642

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000584

Gnomad ASJ exome AF: 0.000601

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000135

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000125

Gnomad OTH exome AF: 0.00115

GnomAD4 exome AF: 0.0000932 AC: 136 AN: 1459724 Hom.: 0 Cov.: 32 AF XY: 0.000106 AC XY: 77 AN XY: 725754

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000449

Gnomad4 ASJ exome AF: 0.000690

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000152

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000522

Gnomad4 OTH exome AF: 0.000298

GnomAD4 genome AF: 0.0000722 AC: 11 AN: 152348 Hom.: 0 Cov.: 32 AF XY: 0.0000671 AC XY: 5 AN XY: 74498

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000267 Hom.: 0

Bravo AF: 0.0000680

ExAC AF: 0.000132 AC: 16

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:3 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Brugada syndrome 9 Pathogenic:3

Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2011	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Apr 09, 2016	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genomic Research Center, Shahid Beheshti University of Medical Sciences	Dec 03, 2017	- -

not provided Uncertain:1 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jan 01, 2023	KCND3: PP2, BS1 -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 20, 2021	This variant is associated with the following publications: (PMID: 31130284, 26582918, 22284586, 30609406, 22840528, 21349352, 26016905, 29247119, 28444220, 30662450, 23963749, 30821013) -
Uncertain significance, no assertion criteria provided	clinical testing	Genetics and Genomic Medicine Centre, NeuroGen Healthcare, NeuroGen Healthcare	Mar 14, 2022	- -

Spinocerebellar ataxia type 19/22 Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	New York Genome Center	Apr 10, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 11, 2023	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mendelics

May 04, 2022

- -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 18, 2023

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	0.13
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.59	.;D;.
Eigen	Benign	-0.027
Eigen_PC	Benign	0.14
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.88	.;D;D
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.22	T;T;T
MetaSVM	Benign	-0.29	T
MutationAssessor	Benign	1.9	L;L;L
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-0.64	N;N;N
REVEL	Uncertain	0.51
Sift	Benign	0.28	T;T;T
Sift4G	Benign	0.79	T;T;T
Polyphen		0.045	.;B;.
Vest4		0.76
MVP		0.85
MPC		0.96
ClinPred		0.070	T
GERP RS		5.3
Varity_R		0.11
gMVP		0.69

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

LitVar

Other links and lift over

dbSNP: rs150401343; hg19: chr1-112323335; COSMIC: COSV56182008;