3-50365164-A-T

Variant names:

• chr3-50365164-A-T
• rs587776948
• NM_006030.4:c.3119T>A

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_006030.4(CACNA2D2):​c.3119T>A​(p.Leu1040Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,910 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1040P) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CACNA2D2 NM_006030.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.40
• Publications: 0 publications found

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

ENSG00000272104 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-50365164-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 40230.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.974

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006030.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA2D2	NM_006030.4	MANE Select	c.3119T>A	p.Leu1040Gln	missense	Exon 36 of 38	NP_006021.2
	CACNA2D2	NM_001174051.3		c.3140T>A	p.Leu1047Gln	missense	Exon 37 of 39	NP_001167522.1
	CACNA2D2	NM_001005505.3		c.3119T>A	p.Leu1040Gln	missense	Exon 36 of 38	NP_001005505.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA2D2	ENST00000424201.7	TSL:1 MANE Select	c.3119T>A	p.Leu1040Gln	missense	Exon 36 of 38	ENSP00000390329.2
	CACNA2D2	ENST00000423994.6	TSL:5	c.3143T>A	p.Leu1048Gln	missense	Exon 37 of 39	ENSP00000407393.2
	CACNA2D2	ENST00000479441.1	TSL:1	c.3140T>A	p.Leu1047Gln	missense	Exon 37 of 39	ENSP00000418081.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459910 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 726280

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26102

East Asian (EAS) AF: 0.00 AC: 0 AN: 39686

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51870

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111720

Other (OTH) AF: 0.00 AC: 0 AN: 60348

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.072	T
Eigen	Pathogenic	0.68
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.68	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Benign	-0.57	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		8.4
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-4.5	D
REVEL	Uncertain	0.53
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.89
MutPred		0.84		Loss of stability (P = 0.022)
MVP		0.47
MPC		1.4
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.81
gMVP		0.75
Mutation Taster		=46/54	disease causing

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

Other links and lift over

dbSNP: rs587776948; hg19: chr3-50402595;