12-2677206-C-G

Variant names:

• chr12-2677206-C-G
• rs773832706
• NM_000719.7:c.4941C>G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000719.7(CACNA1C):​c.4941C>G​(p.Asn1647Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,362 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. N1647N) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CACNA1C NM_000719.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.60

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:):

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

ACMG classification

Verdict is Uncertain_significance. Variant got 1 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.2221426).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CACNA1C	NM_000719.7	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	ENST00000399655.6	NP_000710.5
CACNA1C	NM_001167623.2	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	ENST00000399603.6	NP_001161095.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CACNA1C	ENST00000399603.6	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	5	NM_001167623.2	ENSP00000382512.1
CACNA1C	ENST00000399655.6	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	1	NM_000719.7	ENSP00000382563.1
CACNA1C	ENST00000682544.1	c.5175C>G	p.Asn1725Lys	missense_variant	Exon 42 of 50			ENSP00000507184.1
CACNA1C	ENST00000406454.8	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 48	5		ENSP00000385896.3
CACNA1C	ENST00000399634.6	c.4908C>G	p.Asn1636Lys	missense_variant	Exon 39 of 47	5		ENSP00000382542.2
CACNA1C	ENST00000683824.1	c.5106C>G	p.Asn1702Lys	missense_variant	Exon 41 of 48			ENSP00000507867.1
CACNA1C	ENST00000347598.9	c.5085C>G	p.Asn1695Lys	missense_variant	Exon 42 of 49	1		ENSP00000266376.6
CACNA1C	ENST00000344100.7	c.5064C>G	p.Asn1688Lys	missense_variant	Exon 40 of 47	1		ENSP00000341092.3
CACNA1C	ENST00000327702.12	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 48	1		ENSP00000329877.7
CACNA1C	ENST00000399617.6	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 48	5		ENSP00000382526.1
CACNA1C	ENST00000682462.1	c.5031C>G	p.Asn1677Lys	missense_variant	Exon 40 of 47			ENSP00000507105.1
CACNA1C	ENST00000683781.1	c.5031C>G	p.Asn1677Lys	missense_variant	Exon 40 of 47			ENSP00000507434.1
CACNA1C	ENST00000683840.1	c.5031C>G	p.Asn1677Lys	missense_variant	Exon 40 of 47			ENSP00000507612.1
CACNA1C	ENST00000683956.1	c.5031C>G	p.Asn1677Lys	missense_variant	Exon 40 of 47			ENSP00000506882.1
CACNA1C	ENST00000399638.5	c.5025C>G	p.Asn1675Lys	missense_variant	Exon 41 of 48	1		ENSP00000382547.1
CACNA1C	ENST00000335762.10	c.5016C>G	p.Asn1672Lys	missense_variant	Exon 41 of 48	5		ENSP00000336982.5
CACNA1C	ENST00000399606.5	c.5001C>G	p.Asn1667Lys	missense_variant	Exon 41 of 48	1		ENSP00000382515.1
CACNA1C	ENST00000399621.5	c.4998C>G	p.Asn1666Lys	missense_variant	Exon 40 of 47	1		ENSP00000382530.1
CACNA1C	ENST00000399637.5	c.4998C>G	p.Asn1666Lys	missense_variant	Exon 40 of 47	1		ENSP00000382546.1
CACNA1C	ENST00000402845.7	c.4998C>G	p.Asn1666Lys	missense_variant	Exon 40 of 47	1		ENSP00000385724.3
CACNA1C	ENST00000399629.5	c.4992C>G	p.Asn1664Lys	missense_variant	Exon 40 of 47	1		ENSP00000382537.1
CACNA1C	ENST00000682336.1	c.4983C>G	p.Asn1661Lys	missense_variant	Exon 40 of 47			ENSP00000507898.1
CACNA1C	ENST00000399591.5	c.4965C>G	p.Asn1655Lys	missense_variant	Exon 39 of 46	1		ENSP00000382500.1
CACNA1C	ENST00000399595.5	c.4965C>G	p.Asn1655Lys	missense_variant	Exon 39 of 46	1		ENSP00000382504.1
CACNA1C	ENST00000399649.5	c.4959C>G	p.Asn1653Lys	missense_variant	Exon 39 of 46	1		ENSP00000382557.1
CACNA1C	ENST00000399597.5	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	1		ENSP00000382506.1
CACNA1C	ENST00000399601.5	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	1		ENSP00000382510.1
CACNA1C	ENST00000399641.6	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	1		ENSP00000382549.1
CACNA1C	ENST00000399644.5	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47	1		ENSP00000382552.1
CACNA1C	ENST00000682835.1	c.4941C>G	p.Asn1647Lys	missense_variant	Exon 40 of 47			ENSP00000507282.1
CACNA1C	ENST00000683482.1	c.4932C>G	p.Asn1644Lys	missense_variant	Exon 40 of 47			ENSP00000507169.1
CACNA1C	ENST00000682686.1	c.4908C>G	p.Asn1636Lys	missense_variant	Exon 39 of 46			ENSP00000507309.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461362 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726912

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Long QT syndrome Uncertain:1

Feb 14, 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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 asparagine with lysine at codon 1647 of the CACNA1C protein (p.Asn1647Lys). The asparagine residue is moderately conserved and there is a moderate physicochemical difference between asparagine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.0080	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	8.2
DANN	Uncertain	0.99
DEOGEN2	Benign	0.054	T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.;T
Eigen	Benign	-0.66
Eigen_PC	Benign	-0.69
FATHMM_MKL	Benign	0.24	N
M_CAP	Uncertain	0.21	D
MetaRNN	Benign	0.22	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.46	D
MutationAssessor	Benign	1.6	.;.;.;.;.;.;.;.;.;.;L;.;.;.;.;.;.;.;.;.;.;.;.
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-3.0	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
REVEL	Uncertain	0.33
Sift	Benign	0.036	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;.
Sift4G	Benign	0.16	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;D
Polyphen		0.89, 0.46, 0.0030, 0.17, 0.0020, 0.0090, 0.0050, 0.0010, 0.91, 0.0040, 0.0	.;P;P;B;B;B;B;B;B;B;B;B;P;B;B;.;B;B;.;.;.;B;.
Vest4		0.29
MutPred		0.34		.;.;.;.;.;.;.;.;.;.;Gain of catalytic residue at K1690 (P = 6e-04);.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.84
MPC		1.3
ClinPred		0.40	T
GERP RS		-2.5
gMVP		0.84

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: rs773832706; hg19: chr12-2786372;