3-50364893-C-T

Position:

chr3-50364893-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 3P and 3B. PM2PP2BP4_ModerateBS1_Supporting

The NM_006030.4(CACNA2D2):c.3286G>A(p.Ala1096Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000291 in 1,613,370 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000028 ( 0 hom. )

Consequence

CACNA2D2
NM_006030.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 1.01

Variant links:

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]

CACNA2D2 links:

ENSG00000272104 (HGNC:):

ENSG00000272104 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 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.

BP4

Computational evidence support a benign effect (MetaRNN=0.10904381).

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.0000281 (41/1461076) while in subpopulation NFE AF= 0.0000351 (39/1111886). AF 95% confidence interval is 0.0000263. There are 0 homozygotes in gnomad4_exome. There are 16 alleles in male gnomad4_exome subpopulation. Median coverage is 34. 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	Protein	UniProt
CACNA2D2	NM_006030.4 linkuse as main transcript	c.3286G>A	p.Ala1096Thr	missense_variant	37/38	ENST00000424201.7	NP_006021.2	Q9NY47-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
CACNA2D2	ENST00000424201.7 linkuse as main transcript	c.3286G>A	p.Ala1096Thr	missense_variant	37/38	1	NM_006030.4	ENSP00000390329.2	Q9NY47-2
CACNA2D2	ENST00000423994.6 linkuse as main transcript	c.3316G>A	p.Ala1106Thr	missense_variant	38/39	5		ENSP00000407393.2	C9JVC9
CACNA2D2	ENST00000266039.7 linkuse as main transcript	c.3292G>A	p.Ala1098Thr	missense_variant	37/38	1		ENSP00000266039.3	Q9NY47-3
CACNA2D2	ENST00000360963.7 linkuse as main transcript	c.3085G>A	p.Ala1029Thr	missense_variant	37/38	1		ENSP00000354228.3	Q9NY47-4
ENSG00000272104	ENST00000606589.1 linkuse as main transcript	c.128-1404C>T		intron_variant		3		ENSP00000476225.1	U3KQU4

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000321

AC:

AN:

249076

Hom.:

AF XY:

0.0000222

AC XY:

AN XY:

135222

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000448

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.0000281

AC:

AN:

1461076

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

726846

show subpopulations

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:

0.0000351

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152294

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74450

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000508

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 06, 2021

The c.3307G>A (p.A1103T) alteration is located in exon 38 (coding exon 38) of the CACNA2D2 gene. This alteration results from a G to A substitution at nucleotide position 3307, causing the alanine (A) at amino acid position 1103 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Early infantile epileptic encephalopathy with suppression bursts

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 10, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 240277). This variant has not been reported in the literature in individuals affected with CACNA2D2-related conditions. This variant is present in population databases (rs587723974, gnomAD 0.006%). This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1096 of the CACNA2D2 protein (p.Ala1096Thr). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.070

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.51

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0099

.;T;.;.;.;T

Eigen

Benign

0.068

Eigen_PC

Benign

0.12

FATHMM_MKL

Benign

0.71

LIST_S2

Benign

0.79

T;T;T;T;T;T

M_CAP

Pathogenic

0.31

MetaRNN

Benign

0.11

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.9

.;.;.;.;.;L

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-0.70

N;N;N;N;N;N

REVEL

Benign

0.056

Sift

Benign

0.048

D;D;T;T;D;D

Sift4G

Benign

0.31

T;T;T;T;T;T

Polyphen

0.95, 0.81

.;.;.;.;P;P

Vest4

0.22

MutPred

0.43

Gain of phosphorylation at A1106 (P = 0.0317);.;.;.;.;.;

MVP

0.18

MPC

0.65

ClinPred

0.077

GERP RS

3.4

Varity_R

0.092

gMVP

0.40

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over