rs786205781

chr12-2677809-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_000719.7(CACNA1C):c.5033A>G(p.Glu1678Gly) variant causes a missense change. 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. E1678E) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CACNA1C NM_000719.7 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.06

Genes affected

CACNA1C (HGNC:1390): (calcium voltage-gated channel subunit alpha1 C) This gene encodes an alpha-1 subunit of a voltage-dependent calcium channel. Calcium channels mediate the influx of calcium ions into the cell upon membrane polarization. The alpha-1 subunit consists of 24 transmembrane segments and forms the pore through which ions pass into the cell. The calcium channel consists of a complex of alpha-1, alpha-2/delta, beta, and gamma subunits in a 1:1:1:1 ratio. There are multiple isoforms of each of these proteins, either encoded by different genes or the result of alternative splicing of transcripts. The protein encoded by this gene binds to and is inhibited by dihydropyridine. Alternative splicing results in many transcript variants encoding different proteins. Some of the predicted proteins may not produce functional ion channel subunits. [provided by RefSeq, Oct 2012]

CACNA1C-AS1 (HGNC:40119): (CACNA1C antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, CACNA1C

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA1C	NM_000719.7	c.5033A>G	p.Glu1678Gly	missense_variant	41/47	ENST00000399655.6
CACNA1C	NM_001167623.2	c.5033A>G	p.Glu1678Gly	missense_variant	41/47	ENST00000399603.6
CACNA1C-AS1	NR_045725.1	n.422T>C		non_coding_transcript_exon_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA1C	ENST00000399603.6	c.5033A>G	p.Glu1678Gly	missense_variant	41/47	5	NM_001167623.2
CACNA1C	ENST00000399655.6	c.5033A>G	p.Glu1678Gly	missense_variant	41/47	1	NM_000719.7
CACNA1C-AS1	ENST00000501371.5	n.383T>C		non_coding_transcript_exon_variant	4/4	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 28, 2014

p.Glu1678Gly (GAG>GGG): c.5033 A>G in exon 41 of the CACNA1C gene (NM_000719.6). The E1678G variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. The E1678G variant was not observed in approximately 6,400 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The E1678G variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved in vertebrates. However, in silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Furthermore, no missense mutations in nearby residues have been reported, indicating that this region of the protein may be tolerant of change. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in BRUGADA panel(s). -

Long QT syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 02, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CACNA1C protein function. ClinVar contains an entry for this variant (Variation ID: 190708). This variant has not been reported in the literature in individuals affected with CACNA1C-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 1678 of the CACNA1C protein (p.Glu1678Gly). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
CardioboostArm	Benign	0.0011
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
Cadd	Pathogenic	26
Dann	Uncertain	1.0
DEOGEN2	Benign	0.012	T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.;T
Eigen	Benign	0.13
Eigen_PC	Benign	0.16
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.54	D
MetaRNN	Uncertain	0.70	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-3.9	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
REVEL	Pathogenic	0.65
Sift	Uncertain	0.021	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
Sift4G	Benign	0.34	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.51, 0.065, 0.0010, 0.0090, 0.38, 0.62, 0.71, 0.082, 0.61, 0.57, 0.36, 0.74, 1.0	.;P;B;B;B;B;P;P;P;B;P;P;P;B;P;.;P;P;.;.;.;D;.
Vest4		0.67
MutPred		0.39		.;.;.;.;.;.;.;.;.;.;Loss of solvent accessibility (P = 0.0299);.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.83
MPC		0.29
ClinPred		0.90	D
GERP RS		4.6
gMVP		0.79

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

Other links and lift over

dbSNP: rs786205781; hg19: chr12-2786975;