rs776503550

Positions:

chr19-13283305-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1PP2PP3BS2

The NM_001127222.2(CACNA1A):c.3784G>A(p.Ala1262Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000479 in 1,461,668 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 (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

CACNA1A
NM_001127222.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 6.04

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 Uncertain_significance. Variant got 0 ACMG points.

PM1

In a repeat III (size 283) in uniprot entity CAC1A_HUMAN there are 14 pathogenic changes around while only 1 benign (93%) in NM_001127222.2

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CACNA1A. . Gene score misZ 5.7845 (greater than the threshold 3.09). Trascript score misZ 3.9354 (greater than threshold 3.09). GenCC has associacion of gene with benign paroxysmal torticollis of infancy, developmental and epileptic encephalopathy, 42, undetermined early-onset epileptic encephalopathy, episodic ataxia type 2, familial or sporadic hemiplegic migraine, spinocerebellar ataxia type 6, Lennox-Gastaut syndrome, migraine, familial hemiplegic, 1.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.812

BS2

High AC in GnomAdExome4 at 7 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CACNA1A	NM_001127222.2 linkuse as main transcript	c.3784G>A	p.Ala1262Thr	missense_variant	22/47	ENST00000360228.11	NP_001120694.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CACNA1A	ENST00000360228.11 linkuse as main transcript	c.3784G>A	p.Ala1262Thr	missense_variant	22/47	1	NM_001127222.2	ENSP00000353362		O00555-8

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000802

AC:

AN:

249258

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135194

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000479

AC:

AN:

1461668

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727124

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

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:

0.00000540

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 19, 2024

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1263 of the CACNA1A protein (p.Ala1263Thr). This variant is present in population databases (rs776503550, gnomAD 0.004%). This missense change has been observed in individual(s) with CACNA1A-related conditions (Invitae). ClinVar contains an entry for this variant (Variation ID: 566696). 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 CACNA1A protein function with a positive predictive value of 80%. 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. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 29, 2021

Observed in an individual with ataxia, however, additional detailed clinical information was not provided (Coutelier et al., 2017); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 27535533, 28444220) -

Developmental and epileptic encephalopathy, 42

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Clinical Genetics Laboratory, University Hospital Schleswig-Holstein

Oct 14, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.10

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.96

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

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.50

FATHMM_MKL

Uncertain

0.93

LIST_S2

Pathogenic

0.98

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

M_CAP

Pathogenic

0.38

MetaRNN

Pathogenic

0.81

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

MetaSVM

Pathogenic

1.0

MutationAssessor

Uncertain

2.3

.;.;.;.;M;.;.;.;.;.;.;.;M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.76

PROVEAN

Uncertain

-4.0

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

REVEL

Pathogenic

0.79

Sift

Uncertain

0.016

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

Sift4G

Uncertain

0.037

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

Vest4

0.66

MutPred

0.47

.;.;Gain of glycosylation at A1263 (P = 0.0089);Gain of glycosylation at A1263 (P = 0.0089);Gain of glycosylation at A1263 (P = 0.0089);.;Gain of glycosylation at A1263 (P = 0.0089);.;.;Gain of glycosylation at A1263 (P = 0.0089);Gain of glycosylation at A1263 (P = 0.0089);.;Gain of glycosylation at A1263 (P = 0.0089);.;Gain of glycosylation at A1263 (P = 0.0089);

MVP

0.92

MPC

1.3

ClinPred

0.98

GERP RS

3.9

Varity_R

0.66

gMVP

0.85

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