chr3-54896795-C-T

Position:

• chr3-54896795-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_018398.3(CACNA2D3):​c.2293C>T​(p.His765Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,694 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CACNA2D3 NM_018398.3 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 7.57

Genes affected

CACNA2D3 (HGNC:15460): (calcium voltage-gated channel auxiliary subunit alpha2delta 3) This gene encodes a member of the alpha-2/delta subunit family, a protein in the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell upon membrane polarization and consist of a complex of alpha-1, alpha-2/delta, beta, and gamma subunits in a 1:1:1:1 ratio. Various versions of each of these subunits exist, either expressed from similar genes or the result of alternative splicing. Research on a highly similar protein in rabbit suggests the protein described in this record is cleaved into alpha-2 and delta subunits. Alternate transcriptional splice variants of this gene have been observed but have not been thoroughly characterized. [provided by RefSeq, Jul 2008]

CACNA2D3-AS1 (HGNC:40702): (CACNA2D3 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.755

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA2D3	NM_018398.3	c.2293C>T	p.His765Tyr	missense_variant	26/38	ENST00000474759.6
CACNA2D3-AS1	NR_046666.1	n.261G>A		non_coding_transcript_exon_variant	2/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA2D3	ENST00000474759.6	c.2293C>T	p.His765Tyr	missense_variant	26/38	1	NM_018398.3	P1
CACNA2D3	ENST00000490478.5	c.2011C>T	p.His671Tyr	missense_variant	25/37	1
CACNA2D3-AS1	ENST00000471265.1	n.261G>A		non_coding_transcript_exon_variant	2/7	2
CACNA2D3	ENST00000471363.5	c.*371C>T		3_prime_UTR_variant, NMD_transcript_variant	23/35	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461694 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727132

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

CACNA2D3-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 01, 2023

The CACNA2D3 c.2293C>T variant is predicted to result in the amino acid substitution p.His765Tyr. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Uncertain	0.087	D
BayesDel_noAF	Benign	-0.11
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.26	T;T;T;.
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	.;D;.;D
M_CAP	Benign	0.011	T
MetaRNN	Pathogenic	0.76	D;D;D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	M;M;M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.79	T
PROVEAN	Uncertain	-3.9	D;D;D;D
REVEL	Uncertain	0.30
Sift	Benign	0.064	T;T;T;T
Sift4G	Uncertain	0.012	D;D;D;D
Polyphen		0.99	D;D;D;.
Vest4		0.92
MutPred		0.40		Loss of helix (P = 0.0558);Loss of helix (P = 0.0558);Loss of helix (P = 0.0558);.;
MVP		0.41
MPC		1.0
ClinPred		0.99	D
GERP RS		5.0
Varity_R		0.44
gMVP		0.84

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1700200246; hg19: chr3-54930822;