12-2668962-C-G

Variant names:

• chr12-2668962-C-G
• rs2096394447
• NM_000719.7:c.4653C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000719.7(CACNA1C):​c.4653C>G​(p.Asn1551Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. N1551N) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CACNA1C NM_000719.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.80
• Publications: 0 publications found

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]

ITFG2-AS1 (HGNC:53128): (ITFG2 antisense RNA 1)

CACNA1C-AS2 (HGNC:40118): (CACNA1C antisense RNA 2)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.892

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1C	NM_000719.7	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	ENST00000399655.6	NP_000710.5
CACNA1C	NM_001167623.2	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	ENST00000399603.6	NP_001161095.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1C	ENST00000399603.6	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	5	NM_001167623.2	ENSP00000382512.1
CACNA1C	ENST00000399655.6	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1	NM_000719.7	ENSP00000382563.1
CACNA1C	ENST00000682544.1	c.4887C>G	p.Asn1629Lys	missense_variant	Exon 40 of 50			ENSP00000507184.1
CACNA1C	ENST00000406454.8	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 48	5		ENSP00000385896.3
CACNA1C	ENST00000399634.6	c.4620C>G	p.Asn1540Lys	missense_variant	Exon 37 of 47	5		ENSP00000382542.2
CACNA1C	ENST00000683824.1	c.4818C>G	p.Asn1606Lys	missense_variant	Exon 39 of 48			ENSP00000507867.1
CACNA1C	ENST00000347598.9	c.4797C>G	p.Asn1599Lys	missense_variant	Exon 40 of 49	1		ENSP00000266376.6
CACNA1C	ENST00000344100.7	c.4719C>G	p.Asn1573Lys	missense_variant	Exon 38 of 47	1		ENSP00000341092.3
CACNA1C	ENST00000327702.12	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 48	1		ENSP00000329877.7
CACNA1C	ENST00000399617.6	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 48	5		ENSP00000382526.1
CACNA1C	ENST00000682462.1	c.4743C>G	p.Asn1581Lys	missense_variant	Exon 38 of 47			ENSP00000507105.1
CACNA1C	ENST00000683781.1	c.4743C>G	p.Asn1581Lys	missense_variant	Exon 38 of 47			ENSP00000507434.1
CACNA1C	ENST00000683840.1	c.4743C>G	p.Asn1581Lys	missense_variant	Exon 38 of 47			ENSP00000507612.1
CACNA1C	ENST00000683956.1	c.4743C>G	p.Asn1581Lys	missense_variant	Exon 38 of 47			ENSP00000506882.1
CACNA1C	ENST00000399638.5	c.4737C>G	p.Asn1579Lys	missense_variant	Exon 39 of 48	1		ENSP00000382547.1
CACNA1C	ENST00000335762.10	c.4728C>G	p.Asn1576Lys	missense_variant	Exon 39 of 48	5		ENSP00000336982.5
CACNA1C	ENST00000399606.5	c.4713C>G	p.Asn1571Lys	missense_variant	Exon 39 of 48	1		ENSP00000382515.1
CACNA1C	ENST00000399621.5	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382530.1
CACNA1C	ENST00000399637.5	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382546.1
CACNA1C	ENST00000402845.7	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000385724.3
CACNA1C	ENST00000399629.5	c.4704C>G	p.Asn1568Lys	missense_variant	Exon 38 of 47	1		ENSP00000382537.1
CACNA1C	ENST00000682336.1	c.4695C>G	p.Asn1565Lys	missense_variant	Exon 38 of 47			ENSP00000507898.1
CACNA1C	ENST00000399591.5	c.4620C>G	p.Asn1540Lys	missense_variant	Exon 37 of 46	1		ENSP00000382500.1
CACNA1C	ENST00000399595.5	c.4620C>G	p.Asn1540Lys	missense_variant	Exon 37 of 46	1		ENSP00000382504.1
CACNA1C	ENST00000399649.5	c.4614C>G	p.Asn1538Lys	missense_variant	Exon 37 of 46	1		ENSP00000382557.1
CACNA1C	ENST00000399597.5	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382506.1
CACNA1C	ENST00000399601.5	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382510.1
CACNA1C	ENST00000399641.6	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382549.1
CACNA1C	ENST00000399644.5	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47	1		ENSP00000382552.1
CACNA1C	ENST00000682835.1	c.4653C>G	p.Asn1551Lys	missense_variant	Exon 38 of 47			ENSP00000507282.1
CACNA1C	ENST00000683482.1	c.4644C>G	p.Asn1548Lys	missense_variant	Exon 38 of 47			ENSP00000507169.1
CACNA1C	ENST00000682686.1	c.4620C>G	p.Asn1540Lys	missense_variant	Exon 37 of 46			ENSP00000507309.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461782 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727208

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

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

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111914

Other (OTH) AF: 0.0000331 AC: 2 AN: 60390

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Long QT syndrome Uncertain:1

Aug 28, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals affected with CACNA1C-related conditions. 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) performed at Invitae indicates that this missense variant is expected to disrupt CACNA1C protein function. ClinVar contains an entry for this variant (Variation ID: 1345178). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 1551 of the CACNA1C protein (p.Asn1551Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
CardioboostArm	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.75	D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.;T
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Pathogenic	0.97	D
M_CAP	Pathogenic	0.60	D
MetaRNN	Pathogenic	0.89	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	0.91	D
MutationAssessor	Uncertain	2.5	.;.;.;.;.;.;.;.;.;.;M;.;.;.;.;.;.;.;.;.;.;.;.
PhyloP100		1.8
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.3	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
REVEL	Pathogenic	0.70
Sift	Uncertain	0.017	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
Sift4G	Uncertain	0.028	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
Polyphen		0.66, 0.99, 0.099, 0.93, 0.78, 1.0, 0.96, 1.0, 1.0	.;P;D;B;P;P;D;D;D;D;D;D;D;D;D;.;D;D;.;.;.;D;.
Vest4		0.93
MutPred		0.46		.;.;.;.;.;.;.;.;.;.;Gain of catalytic residue at N1595 (P = 0);.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.93
MPC		2.3
ClinPred		0.99	D
GERP RS		2.8
gMVP		0.99
Mutation Taster		=20/80	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: rs2096394447; hg19: chr12-2778128;