chr7-81997232-G-C

Position:

• chr7-81997232-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000722.4(CACNA2D1):​c.1609C>G​(p.Pro537Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P537P) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CACNA2D1 NM_000722.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.88

Genes affected

CACNA2D1 (HGNC:1399): (calcium voltage-gated channel auxiliary subunit alpha2delta 1) The preproprotein encoded by this gene is cleaved into multiple chains that comprise the alpha-2 and delta subunits of the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell upon membrane polarization. Mutations in this gene can cause cardiac deficiencies, including Brugada syndrome and short QT syndrome. Alternate splicing results in multiple transcript variants, some of which may lack the delta subunit portion. [provided by RefSeq, Nov 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA2D1	NM_000722.4	c.1609C>G	p.Pro537Ala	missense_variant	19/39	ENST00000356860.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA2D1	ENST00000356860.8	c.1609C>G	p.Pro537Ala	missense_variant	19/39	1	NM_000722.4
CACNA2D1	ENST00000443883.2	c.1666C>G	p.Pro556Ala	missense_variant	20/39	5		P1
CACNA2D1	ENST00000705962.1	c.1510C>G	p.Pro504Ala	missense_variant	19/38
CACNA2D1	ENST00000705961.1	c.1378C>G	p.Pro460Ala	missense_variant	17/37

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Brugada syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 04, 2018

This sequence change replaces proline with alanine at codon 537 of the CACNA2D1 protein (p.Pro537Ala). The proline residue is highly conserved and there is a small physicochemical difference between proline and alanine. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a CACNA2D1-related disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Uncertain	0.023	T
BayesDel_noAF	Benign	-0.20
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.59	.;D
Eigen	Uncertain	0.33
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D;D
M_CAP	Benign	0.023	T
MetaRNN	Uncertain	0.51	D;D
MetaSVM	Benign	-0.94	T
MutationAssessor	Uncertain	2.1	.;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Uncertain	0.39
Sift	Uncertain	0.0040	D;D
Sift4G	Uncertain	0.011	D;D
Polyphen		1.0	D;.
Vest4		0.75
MutPred		0.51		Gain of sheet (P = 0.0166);.;
MVP		0.20
MPC		1.3
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.31
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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

Other links and lift over

dbSNP: rs1554345090; hg19: chr7-81626548;