rs772555143

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2PP3

The NM_006030.4(CACNA2D2):c.2969C>T(p.Ala990Val) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000507 in 1,577,748 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

CACNA2D2
NM_006030.4 missense, splice_region

Scores

Splicing: ADA: 0.9876

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.31

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

cerebellar atrophy with seizures and variable developmental delay
Inheritance: AR Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
complex neurodevelopmental disorder
Inheritance: AR Classification: MODERATE Submitted by: ClinGen

CACNA2D2 links:

ENSG00000272104 (HGNC:):

ENSG00000272104 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA2D2	NM_006030.4 link	c.2969C>T	p.Ala990Val	missense_variant, splice_region_variant	Exon 34 of 38	ENST00000424201.7	NP_006021.2	Q9NY47-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CACNA2D2	ENST00000424201.7 link	c.2969C>T	p.Ala990Val	missense_variant, splice_region_variant	Exon 34 of 38	1	NM_006030.4	ENSP00000390329.2	Q9NY47-2
CACNA2D2	ENST00000423994.6 link	c.2993C>T	p.Ala998Val	missense_variant, splice_region_variant	Exon 35 of 39	5		ENSP00000407393.2	C9JVC9
CACNA2D2	ENST00000266039.7 link	c.2969C>T	p.Ala990Val	missense_variant, splice_region_variant	Exon 34 of 38	1		ENSP00000266039.3	Q9NY47-3
CACNA2D2	ENST00000360963.7 link	c.2762C>T	p.Ala921Val	missense_variant, splice_region_variant	Exon 34 of 38	1		ENSP00000354228.3	Q9NY47-4
ENSG00000272104	ENST00000606589.1 link	c.128-662G>A		intron_variant	Intron 2 of 3	3		ENSP00000476225.1	U3KQU4

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000524

AC:

AN:

190762

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.0000844

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.01e-7

AC:

AN:

1425534

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

705396

show subpopulations

African (AFR)

AF:

0.0000302

AC:

AN:

33096

American (AMR)

AF:

0.00

AC:

AN:

37796

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25388

East Asian (EAS)

AF:

0.00

AC:

AN:

38438

South Asian (SAS)

AF:

0.00

AC:

AN:

81912

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50362

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5720

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1093720

Other (OTH)

AF:

0.00

AC:

AN:

59102

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.725

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152214

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74358

show subpopulations

African (AFR)

AF:

0.000169

AC:

AN:

41450

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68042

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.518

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.00000835

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy

Uncertain:1

Oct 06, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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 sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. This variant has not been reported in the literature in individuals affected with CACNA2D2-related conditions. This variant is present in population databases (rs772555143, ExAC 0.02%). This sequence change replaces alanine with valine at codon 990 of the CACNA2D2 protein (p.Ala990Val). The alanine residue is moderately conserved and there is a small physicochemical difference between alanine and valine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.050

BayesDel_noAF

Benign

-0.31

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.018

.;T;.;.;.;T

Eigen

Benign

0.11

Eigen_PC

Benign

0.21

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.90

D;D;D;D;D;D

M_CAP

Benign

0.066

MetaRNN

Benign

0.21

T;T;T;T;T;T

MetaSVM

Benign

-0.39

MutationAssessor

Uncertain

2.2

.;.;.;.;.;M

PhyloP100

5.3

PrimateAI

Uncertain

0.59

PROVEAN

Benign

-1.3

N;N;N;N;N;N

REVEL

Benign

0.11

Sift

Uncertain

0.022

D;T;T;T;T;D

Sift4G

Uncertain

0.023

D;D;D;D;D;D

Polyphen

0.42, 0.15

.;.;.;.;B;B

Vest4

0.49

MutPred

0.47

.;.;.;.;.;Loss of disorder (P = 0.0615);

MVP

0.28

MPC

0.66

ClinPred

0.72

GERP RS

4.0

Varity_R

0.14

gMVP

0.28

Mutation Taster

=83/17

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.99

dbscSNV1_RF

Pathogenic

0.80

SpliceAI score (max)

0.74

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.74

Position offset: 2

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

Publications

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rs772555143

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over