3-50364728-G-A

Position:

chr3-50364728-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PM2PP2BP4_StrongBS1_Supporting

The NM_006030.4(CACNA2D2):c.3370C>T(p.Leu1124Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00112 in 1,556,012 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. L1124L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00084 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 0 hom. )

Consequence

CACNA2D2
NM_006030.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 8.78

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:

LOC127898564 (HGNC:):

LOC127898564 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. 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.

BP4

Computational evidence support a benign effect (MetaRNN=0.03937286).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000841 (128/152216) while in subpopulation NFE AF= 0.00151 (103/68028). AF 95% confidence interval is 0.00128. There are 0 homozygotes in gnomad4. There are 50 alleles in male gnomad4 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 linkuse as main transcript	c.3370C>T	p.Leu1124Phe	missense_variant	38/38	ENST00000424201.7
LOC127898564	NR_183066.1 linkuse as main transcript	n.835-1569G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA2D2	ENST00000424201.7 linkuse as main transcript	c.3370C>T	p.Leu1124Phe	missense_variant	38/38	1	NM_006030.4	P4	Q9NY47-2

Frequencies

GnomAD3 genomes

AF:

0.000841

AC:

128

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000289

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000392

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000565

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00151

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000656

AC:

108

AN:

164638

Hom.:

AF XY:

0.000648

AC XY:

AN XY:

88000

show subpopulations

Gnomad AFR exome

AF:

0.000111

Gnomad AMR exome

AF:

0.000278

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000414

Gnomad FIN exome

AF:

0.000375

Gnomad NFE exome

AF:

0.00142

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00115

AC:

1608

AN:

1403796

Hom.:

Cov.:

AF XY:

0.00109

AC XY:

758

AN XY:

693420

show subpopulations

Gnomad4 AFR exome

AF:

0.000253

Gnomad4 AMR exome

AF:

0.000221

Gnomad4 ASJ exome

AF:

0.0000397

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000124

Gnomad4 FIN exome

AF:

0.000370

Gnomad4 NFE exome

AF:

0.00142

Gnomad4 OTH exome

AF:

0.000619

GnomAD4 genome

AF:

0.000841

AC:

128

AN:

152216

Hom.:

Cov.:

AF XY:

0.000672

AC XY:

AN XY:

74368

show subpopulations

Gnomad4 AFR

AF:

0.000289

Gnomad4 AMR

AF:

0.000392

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000565

Gnomad4 NFE

AF:

0.00151

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.00118

Hom.:

Bravo

AF:

0.000638

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.000469

AC:

ESP6500EA

AF:

0.000715

AC:

ExAC

AF:

0.000426

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Dec 22, 2022	BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 08, 2024	In silico analysis indicates that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Early infantile epileptic encephalopathy with suppression bursts

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 01, 2022

This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 1124 of the CACNA2D2 protein (p.Leu1124Phe). This variant is present in population databases (rs147278705, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with CACNA2D2-related conditions. ClinVar contains an entry for this variant (Variation ID: 461320). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.39

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.035

.;T;.;.;.;T

Eigen

Uncertain

0.66

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.71

T;T;T;T;T;T

M_CAP

Benign

0.065

MetaRNN

Benign

0.039

T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.0

.;.;.;.;.;N

MutationTaster

Benign

1.0

D;D;D;D;D;D;D;D

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-1.0

N;N;N;N;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.029

D;D;D;T;D;D

Sift4G

Uncertain

0.020

D;D;D;D;D;D

Polyphen

1.0, 0.99

.;.;.;.;D;D

Vest4

0.37

MVP

0.14

MPC

1.2

ClinPred

0.096

GERP RS

4.6

Varity_R

0.17

gMVP

0.66

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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