rs1555968941

Positions:

• chr12-2653847-G-A
• chr12-2653847-G-C
• chr12-2653847-G-T

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5_Very_Strong

The NM_000719.7(CACNA1C):​c.4087G>A​(p.Val1363Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1363L) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CACNA1C NM_000719.7 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 9.99

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]

ACMG classification

Verdict is Pathogenic. Variant got 17 ACMG points.

• PM1: In a topological_domain Extracellular (size 50) in uniprot entity CAC1C_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_000719.7
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-2653847-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 522828.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, CACNA1C
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.932
• PP5: Variant 12-2653847-G-A is Pathogenic according to our data. Variant chr12-2653847-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 450063.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA1C	NM_000719.7	c.4087G>A	p.Val1363Met	missense_variant	33/47	ENST00000399655.6
CACNA1C	NM_001167623.2	c.4087G>A	p.Val1363Met	missense_variant	33/47	ENST00000399603.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA1C	ENST00000399603.6	c.4087G>A	p.Val1363Met	missense_variant	33/47	5	NM_001167623.2
CACNA1C	ENST00000399655.6	c.4087G>A	p.Val1363Met	missense_variant	33/47	1	NM_000719.7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 30, 2017	The V1363M variant in the CACNA1C gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The V1363M variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The V1363M variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. However, this substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret V1363M as a likely pathogenic variant. -
Likely pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2018	- -

Neurodevelopmental disorder with hypotonia, language delay, and skeletal defects with or without seizures Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 14, 2022

- -

CACNA1C-related disorder Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

-

Variant interpretted as Likely pathogenic and reported on 07/24/2017 by GTR ID 26957. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.80	D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.;T
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	1.0	D
M_CAP	Pathogenic	0.92	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	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	Pathogenic	0.93	D
PROVEAN	Uncertain	-2.9	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
REVEL	Pathogenic	0.91
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;.
Sift4G	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
Polyphen		1.0, 1.0, 1.0	.;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.;D;D;.;.;.;D;.
Vest4		0.91
MutPred		0.67		.;.;.;.;.;.;.;.;.;.;Gain of catalytic residue at V1416 (P = 4e-04);.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.94
MPC		2.2
ClinPred		1.0	D
GERP RS		4.6
gMVP		0.96

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: rs1555968941; hg19: chr12-2763013;