rs187393245

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_001127222.2(CACNA1A):c.3166C>T(p.Arg1056Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000341 in 1,613,484 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1056H) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00036 ( 8 hom. )

Consequence

CACNA1A
NM_001127222.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:1

Conservation

PhyloP100: 5.45

Variant links:

Genes affected

CACNA1A (HGNC:1388): (calcium voltage-gated channel subunit alpha1 A) Voltage-dependent calcium channels mediate the entry of calcium ions into excitable cells, and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, and gene expression. Calcium channels are multisubunit complexes composed of alpha-1, beta, alpha-2/delta, and gamma subunits. The channel activity is directed by the pore-forming alpha-1 subunit, whereas, the others act as auxiliary subunits regulating this activity. The distinctive properties of the calcium channel types are related primarily to the expression of a variety of alpha-1 isoforms, alpha-1A, B, C, D, E, and S. This gene encodes the alpha-1A subunit, which is predominantly expressed in neuronal tissue. Mutations in this gene are associated with 2 neurologic disorders, familial hemiplegic migraine and episodic ataxia 2. This gene also exhibits polymorphic variation due to (CAG)n-repeats. Multiple transcript variants encoding different isoforms have been found for this gene. In one set of transcript variants, the (CAG)n-repeats occur in the 3' UTR, and are not associated with any disease. But in another set of variants, an insertion extends the coding region to include the (CAG)n-repeats which encode a polyglutamine tract. Expansion of the (CAG)n-repeats from the normal 4-18 to 21-33 in the coding region is associated with spinocerebellar ataxia 6. [provided by RefSeq, Jul 2016]

CACNA1A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

PP2

Missense variant where missense usually causes diseases, CACNA1A

BP4

Computational evidence support a benign effect (MetaRNN=0.019113302).

BP6

Variant 19-13286890-G-A is Benign according to our data. Variant chr19-13286890-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 385634.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Benign=1}.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000204 (31/152312) while in subpopulation EAS AF= 0.0058 (30/5176). AF 95% confidence interval is 0.00417. There are 0 homozygotes in gnomad4. There are 16 alleles in male gnomad4 subpopulation. This position pass quality control queck.

BS2

High AC in GnomAd at 31 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CACNA1A	NM_001127222.2 linkuse as main transcript	c.3166C>T	p.Arg1056Cys	missense_variant	20/47	ENST00000360228.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CACNA1A	ENST00000360228.11 linkuse as main transcript	c.3166C>T	p.Arg1056Cys	missense_variant	20/47	1	NM_001127222.2		O00555-8

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152194

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:

0.00578

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000269

AC:

AN:

245698

Hom.:

AF XY:

0.000224

AC XY:

AN XY:

134156

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00363

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000167

GnomAD4 exome

AF:

0.000355

AC:

519

AN:

1461172

Hom.:

Cov.:

AF XY:

0.000334

AC XY:

243

AN XY:

726874

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0123

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000198

Gnomad4 OTH exome

AF:

0.000133

GnomAD4 genome

AF:

0.000204

AC:

AN:

152312

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00580

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000161

Hom.:

Bravo

AF:

0.0000680

ExAC

AF:

0.000333

AC:

Asia WGS

AF:

0.00260

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 29, 2016

A variant of uncertain significance has been identified in the CACNA1A gene. The R1057C variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. It was not observed in approximately 5,800 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project. The 1000 Genomes Project reports R1057C was observed in 4/208 (2.0%) alleles from individuals of Japanese background, indicating it may be a rare (benign) variant in this population. The R1057C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved in mammals, and in silico analysis predicts this variant is probably damaging to the protein structure/function. However, missense variants in nearby residues have not been reported in Human Gene Mutation Database in association with CACNA1A-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 07, 2017

The p.R1057C variant (also known as c.3169C>T), located in coding exon 20 of the CACNA1A gene, results from a C to T substitution at nucleotide position 3169. The arginine at codon 1057 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is well 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. -

Episodic ataxia type 2;C4310716:Developmental and epileptic encephalopathy, 42

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Dec 30, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.045

BayesDel_noAF

Pathogenic

0.16

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.95

D;D;D;D;D;D;D;D;.;D;D;D;D;D;D

M_CAP

Pathogenic

0.80

MetaRNN

Benign

0.019

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Pathogenic

0.80

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.63

Sift4G

Uncertain

0.020

D;D;.;.;.;.;.;.;.;.;.;.;.;.;.

Vest4

0.74

MVP

0.91

MPC

0.022

ClinPred

0.19

GERP RS

5.2

Varity_R

0.20

gMVP

0.54

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