rs786205769

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PP2PP3_Moderate

The NM_000719.7(CACNA1C):c.538G>A(p.Ala180Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000325 in 1,601,328 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A180G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000034 ( 0 hom. )

Consequence

CACNA1C
NM_000719.7 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 9.95

Variant links:

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 links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PP2

Missense variant where missense usually causes diseases, CACNA1C

PP3

MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA1C	NM_000719.7 linkuse as main transcript	c.538G>A	p.Ala180Thr	missense_variant	4/47	ENST00000399655.6
CACNA1C	NM_001167623.2 linkuse as main transcript	c.538G>A	p.Ala180Thr	missense_variant	4/47	ENST00000399603.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	UniProt
CACNA1C	ENST00000399603.6 linkuse as main transcript	c.538G>A	p.Ala180Thr	missense_variant	4/47	5	NM_001167623.2	Q13936-37
CACNA1C	ENST00000399655.6 linkuse as main transcript	c.538G>A	p.Ala180Thr	missense_variant	4/47	1	NM_000719.7	Q13936-12
	ENST00000649808.1 linkuse as main transcript	n.208+117C>T		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152000

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000849

AC:

AN:

235502

Hom.:

AF XY:

0.00000786

AC XY:

AN XY:

127280

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000587

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000949

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000338

AC:

AN:

1449328

Hom.:

Cov.:

AF XY:

0.0000278

AC XY:

AN XY:

720510

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000417

Gnomad4 OTH exome

AF:

0.0000333

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152000

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74232

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000564

Hom.:

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	AiLife Diagnostics, AiLife Diagnostics	Feb 10, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 21, 2017	The Ala180Thr variant in the CACNA1C gene has not been reported previously as a disease-causing mutation nor is it known to be a common benign polymorphism, to our knowledge. Ala180Thr represents a non-conservative amino acid substitution of a non-polar Alanine residue with a polar Threonine residue in an evolutionarily highly conserved position of the protein. In addition, Ala180Thr was not observed in up to 600 chromosomes of Caucasian and African American individuals tested at GeneDx, indicating it is not a common benign polymorphism in these populations. Thus, with the clinical and molecular information available at this time, we cannot conclude unequivocally that Ala180Thr is a disease-causing mutation associated with arrhythmia. The variant is found in BRUGADA panel(s). -

Long QT syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Sep 22, 2022

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 180 of the CACNA1C protein (p.Ala180Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with CACNA1C-related conditions. ClinVar contains an entry for this variant (Variation ID: 190690). 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. 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. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 24, 2019

The p.A180T variant (also known as c.538G>A), located in coding exon 4 of the CACNA1C gene, results from a G to A substitution at nucleotide position 538. The alanine at codon 180 is replaced by threonine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

CardioboostArm

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.51

BayesDel_noAF

Pathogenic

0.50

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.79

D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.;.;.;.;T;.

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Pathogenic

0.98

M_CAP

Pathogenic

0.77

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

1.1

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;D

PrimateAI

Uncertain

0.78

PROVEAN

Uncertain

-3.4

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

0.89

Sift

Uncertain

0.029

D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.013

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, 0.98, 0.64, 0.99, 0.88, 0.74, 0.64

.;D;.;D;D;D;D;P;D;D;D;P;D;D;P;D;.;D;P;.;.;.;.

Vest4

0.85

MutPred

0.69

Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);Gain of catalytic residue at F185 (P = 0.002);

MVP

0.94

MPC

2.2

ClinPred

0.95

GERP RS

4.9

gMVP

0.87

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over