1-111776086-G-A

Position:

• chr1-111776086-G-A

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_001378969.1(KCND3):​c.1959C>T​(p.Ser653=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000232 in 1,614,054 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00025 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00023 (1 hom.)
• Consequence: KCND3 NM_001378969.1 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -3.46

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 Benign. Variant got -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).
• BP6: Variant 1-111776086-G-A is Benign according to our data. Variant chr1-111776086-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 508338.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-3.46 with no splicing effect.
• BS2: High AC in GnomAd4 at 38 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KCND3	NM_001378969.1	c.1959C>T	p.Ser653=	synonymous_variant	8/8	ENST00000302127.5	NP_001365898.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KCND3	ENST00000302127.5	c.1959C>T	p.Ser653=	synonymous_variant	8/8	5	NM_001378969.1	ENSP00000306923	P3
KCND3	ENST00000315987.6	c.1959C>T	p.Ser653=	synonymous_variant	8/8	1		ENSP00000319591	P3
KCND3	ENST00000369697.5	c.1902C>T	p.Ser634=	synonymous_variant	6/6	1		ENSP00000358711	A1

Frequencies

GnomAD3 genomes AF: 0.000250 AC: 38 AN: 152172 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000283

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000514

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000263 AC: 66 AN: 251058 Hom.: 0 AF XY: 0.000265 AC XY: 36 AN XY: 135728

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.000298

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.000185

Gnomad NFE exome AF: 0.000494

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000230 AC: 336 AN: 1461882 Hom.: 1 Cov.: 31 AF XY: 0.000249 AC XY: 181 AN XY: 727242

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.000268

Gnomad4 EAS exome AF: 0.000101

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.000112

Gnomad4 NFE exome AF: 0.000279

Gnomad4 OTH exome AF: 0.0000828

GnomAD4 genome AF: 0.000250 AC: 38 AN: 152172 Hom.: 0 Cov.: 32 AF XY: 0.000229 AC XY: 17 AN XY: 74332

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000283

Gnomad4 NFE AF: 0.000514

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000411 Hom.: 0

Bravo AF: 0.000212

EpiCase AF: 0.000273

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Sep 25, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 17, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2023	KCND3: BP4, BP7 -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 31, 2016

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. -

Spinocerebellar ataxia type 19/22 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	5.1
DANN	Benign	0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs147087785; hg19: chr1-112318708;