rs779326054

Positions:

• chr3-50379586-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BS1_Supporting

The NM_006030.4(CACNA2D2):​c.998A>G​(p.Asn333Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000479 in 1,461,570 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 Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. N333N) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: CACNA2D2 NM_006030.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.09

Genes affected

CACNA2D2 (HGNC:1400): (calcium voltage-gated channel auxiliary subunit alpha2delta 2) Calcium channels mediate the entry of calcium ions into the cell upon membrane polarization. This gene encodes the alpha-2/delta subunit of the voltage-dependent calcium channel complex. The complex consists of the main channel-forming subunit alpha-1, and auxiliary subunits alpha-2/delta, beta, and gamma. The auxiliary subunits function in the assembly and membrane localization of the complex, and modulate calcium currents and channel activation/inactivation kinetics. The subunit encoded by this gene undergoes post-translational cleavage to yield the extracellular alpha2 peptide and a membrane-anchored delta polypeptide. This subunit is a receptor for the antiepileptic drug, gabapentin. Mutations in this gene are associated with early infantile epileptic encephalopathy. Single nucleotide polymorphisms in this gene are correlated with increased sensitivity to opioid drugs. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CACNA2D2. . Gene score misZ 2.9999 (greater than the threshold 3.09). Trascript score misZ 3.123 (greater than threshold 3.09). GenCC has associacion of gene with cerebellar atrophy with seizures and variable developmental delay, complex neurodevelopmental disorder.
• BS1: Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.00000479 (7/1461570) while in subpopulation EAS AF= 0.000151 (6/39700). AF 95% confidence interval is 0.0000651. There are 0 homozygotes in gnomad4_exome. There are 3 alleles in male gnomad4_exome subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA2D2	NM_006030.4	c.998A>G	p.Asn333Ser	missense_variant	11/38	ENST00000424201.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA2D2	ENST00000424201.7	c.998A>G	p.Asn333Ser	missense_variant	11/38	1	NM_006030.4	P4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000319 AC: 8 AN: 250848 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135626

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000381

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461570 Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3 AN XY: 727076

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000151

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000494 AC: 6

Asia WGS AF: 0.000289 AC: 2 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Oct 11, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.52
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	.;T;.;.;.;D
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.93	D;D;D;D;D;D
M_CAP	Benign	0.0099	T
MetaRNN	Benign	0.30	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.1	.;.;L;.;L;L
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Uncertain	-3.2	D;D;D;D;D;D
REVEL	Benign	0.16
Sift	Uncertain	0.016	D;D;T;T;D;D
Sift4G	Uncertain	0.016	D;D;D;D;D;D
Polyphen		0.96, 0.99	.;.;.;.;D;D
Vest4		0.42
MutPred		0.67		Loss of catalytic residue at N333 (P = 0.0161);Loss of catalytic residue at N333 (P = 0.0161);Loss of catalytic residue at N333 (P = 0.0161);.;Loss of catalytic residue at N333 (P = 0.0161);Loss of catalytic residue at N333 (P = 0.0161);
MVP		0.20
MPC		0.89
ClinPred		0.32	T
GERP RS		5.0
Varity_R		0.33
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.37		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.37		Position offset: -1

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

Publications

LitVar

Other links and lift over

dbSNP: rs779326054; hg19: chr3-50417017;