1-111776150-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001378969.1(KCND3):c.1895C>G(p.Pro632Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P632L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCND3 NM_001378969.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.26

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, KCND3
• BP4: Computational evidence support a benign effect (MetaRNN=0.1928482).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KCND3	NM_001378969.1	c.1895C>G	p.Pro632Arg	missense_variant	8/8	ENST00000302127.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KCND3	ENST00000302127.5	c.1895C>G	p.Pro632Arg	missense_variant	8/8	5	NM_001378969.1	P3
KCND3	ENST00000315987.6	c.1895C>G	p.Pro632Arg	missense_variant	8/8	1		P3
KCND3	ENST00000369697.5	c.1838C>G	p.Pro613Arg	missense_variant	6/6	1		A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 11, 2022

The p.P632R variant (also known as c.1895C>G), located in coding exon 7 of the KCND3 gene, results from a C to G substitution at nucleotide position 1895. The proline at codon 632 is replaced by arginine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.030
Cadd	Uncertain	24
Dann	Uncertain	0.99
Eigen	Benign	0.10
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Benign	0.081	D
MetaRNN	Benign	0.19	T;T;T
MetaSVM	Uncertain	0.15	D
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.98	N;N;N
REVEL	Uncertain	0.43
Sift	Uncertain	0.0050	D;D;D
Sift4G	Uncertain	0.050	T;D;T
Polyphen		0.0040	.;B;.
Vest4		0.20
MutPred		0.22		.;Loss of glycosylation at P632 (P = 0.0048);.;
MVP		0.57
MPC		0.91
ClinPred		0.89	D
GERP RS		5.8
Varity_R		0.17
gMVP		0.57

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: rs1261735013; hg19: chr1-112318772;