chr12-2605113-G-A

Variant names:

• chr12-2605113-G-A
• rs755609118
• NM_000719.7:c.2993G>A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_000719.7(CACNA1C):​c.2993G>A​(p.Arg998Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,562 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 11/19 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CACNA1C NM_000719.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 10.0

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-AS3 (HGNC:40117): (CACNA1C antisense RNA 3)

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the CACNA1C gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 45 curated pathogenic missense variants (we use a threshold of 10). The gene has 91 curated benign missense variants. Gene score misZ: 6.4654 (above the threshold of 3.09). Trascript score misZ: 7.2674 (above the threshold of 3.09). GenCC associations: The gene is linked to intellectual disability, neurodevelopmental disorder with hypotonia, language delay, and skeletal defects with or without seizures, Brugada syndrome, long QT syndrome, short QT syndrome, long qt syndrome 8, Timothy syndrome, Brugada syndrome 3.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.934

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1C	NM_000719.7	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	ENST00000399655.6	NP_000710.5
CACNA1C	NM_001167623.2	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	ENST00000399603.6	NP_001161095.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1C	ENST00000399603.6	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	5	NM_001167623.2	ENSP00000382512.1
CACNA1C	ENST00000399655.6	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1	NM_000719.7	ENSP00000382563.1
CACNA1C	ENST00000682544.1	c.3143G>A	p.Arg1048Gln	missense_variant	Exon 24 of 50			ENSP00000507184.1
CACNA1C	ENST00000406454.8	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 48	5		ENSP00000385896.3
CACNA1C	ENST00000399634.6	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	5		ENSP00000382542.2
CACNA1C	ENST00000683824.1	c.3158G>A	p.Arg1053Gln	missense_variant	Exon 24 of 48			ENSP00000507867.1
CACNA1C	ENST00000347598.9	c.3053G>A	p.Arg1018Gln	missense_variant	Exon 24 of 49	1		ENSP00000266376.6
CACNA1C	ENST00000344100.7	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000341092.3
CACNA1C	ENST00000327702.12	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 48	1		ENSP00000329877.7
CACNA1C	ENST00000399617.6	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 48	5		ENSP00000382526.1
CACNA1C	ENST00000682462.1	c.3083G>A	p.Arg1028Gln	missense_variant	Exon 23 of 47			ENSP00000507105.1
CACNA1C	ENST00000683781.1	c.3083G>A	p.Arg1028Gln	missense_variant	Exon 23 of 47			ENSP00000507434.1
CACNA1C	ENST00000683840.1	c.3083G>A	p.Arg1028Gln	missense_variant	Exon 23 of 47			ENSP00000507612.1
CACNA1C	ENST00000683956.1	c.3083G>A	p.Arg1028Gln	missense_variant	Exon 23 of 47			ENSP00000506882.1
CACNA1C	ENST00000399638.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 48	1		ENSP00000382547.1
CACNA1C	ENST00000335762.10	c.3068G>A	p.Arg1023Gln	missense_variant	Exon 24 of 48	5		ENSP00000336982.5
CACNA1C	ENST00000399606.5	c.3053G>A	p.Arg1018Gln	missense_variant	Exon 24 of 48	1		ENSP00000382515.1
CACNA1C	ENST00000399621.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382530.1
CACNA1C	ENST00000399637.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382546.1
CACNA1C	ENST00000402845.7	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000385724.3
CACNA1C	ENST00000399629.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382537.1
CACNA1C	ENST00000682336.1	c.3068G>A	p.Arg1023Gln	missense_variant	Exon 24 of 47			ENSP00000507898.1
CACNA1C	ENST00000399591.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 46	1		ENSP00000382500.1
CACNA1C	ENST00000399595.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 46	1		ENSP00000382504.1
CACNA1C	ENST00000399649.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 46	1		ENSP00000382557.1
CACNA1C	ENST00000399597.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382506.1
CACNA1C	ENST00000399601.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382510.1
CACNA1C	ENST00000399641.6	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382549.1
CACNA1C	ENST00000399644.5	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47	1		ENSP00000382552.1
CACNA1C	ENST00000682835.1	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 47			ENSP00000507282.1
CACNA1C	ENST00000683482.1	c.2984G>A	p.Arg995Gln	missense_variant	Exon 23 of 47			ENSP00000507169.1
CACNA1C	ENST00000682686.1	c.2993G>A	p.Arg998Gln	missense_variant	Exon 23 of 46			ENSP00000507309.1
CACNA1C	ENST00000480911.6	n.*1600G>A		non_coding_transcript_exon_variant	Exon 21 of 27	5		ENSP00000437936.2
CACNA1C	ENST00000480911.6	n.*1600G>A		3_prime_UTR_variant	Exon 21 of 27	5		ENSP00000437936.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461562 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727084

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Long QT syndrome Uncertain:1

Jun 16, 2020

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 missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CACNA1C-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces arginine with glutamine at codon 998 of the CACNA1C protein (p.Arg998Gln). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and glutamine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.85	D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.97
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.89	D
MetaRNN	Pathogenic	0.93	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	0.97	D
MutationAssessor	Pathogenic	4.7	.;.;.;.;.;.;.;.;.;.;.;H;H;.;.;.;.;.;.;.;.;.;.
PrimateAI	Pathogenic	0.91	D
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;D
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
Polyphen		1.0, 1.0, 1.0	.;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.;D;D;.;.;.;D
Vest4		0.90
MutPred		0.65		.;.;.;.;.;.;.;.;.;.;.;Loss of MoRF binding (P = 0.0309);Loss of MoRF binding (P = 0.0309);.;.;.;.;.;.;.;.;.;.;
MVP		0.99
MPC		2.4
ClinPred		1.0	D
GERP RS		4.5
gMVP		1.0

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: rs755609118; hg19: chr12-2714279; COSMIC: COSV59738272; COSMIC: COSV59738272;