rs121909323
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The NM_001127222.2(CACNA1A):c.3829C>T(p.Arg1277Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 31)
Consequence
CACNA1A
NM_001127222.2 stop_gained
NM_001127222.2 stop_gained
Scores
3
3
1
Clinical Significance
Conservation
PhyloP100: 3.21
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
?
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 19-13277122-G-A is Pathogenic according to our data. Variant chr19-13277122-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 8506.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CACNA1A | NM_001127222.2 | c.3829C>T | p.Arg1277Ter | stop_gained | 23/47 | ENST00000360228.11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CACNA1A | ENST00000360228.11 | c.3829C>T | p.Arg1277Ter | stop_gained | 23/47 | 1 | NM_001127222.2 |
Frequencies
GnomAD3 genomes ? Cov.: 31
GnomAD3 genomes
?
Cov.:
31
GnomAD4 exome Cov.: 29
GnomAD4 exome
Cov.:
29
GnomAD4 genome ? Cov.: 31
GnomAD4 genome
?
Cov.:
31
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Episodic ataxia type 2 Pathogenic:2
Pathogenic, no assertion criteria provided | clinical testing | E. Rossignol Lab, CHU Ste-Justine, Universite de Montreal | Nov 25, 2014 | - - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Nov 27, 2001 | - - |
Episodic ataxia type 2;C4310716:Developmental and epileptic encephalopathy, 42 Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Apr 16, 2021 | For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this variant affects CACNA1A protein function (PMID: 11742003). This variant has been observed in individual(s) with CACNA1A-related conditions (PMID: 9600739, 25784583, 25735478). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 8506). This variant is also known as c.4110C>T (p.Arg1279*). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Arg1278*) in the CACNA1A gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CACNA1A are known to be pathogenic (PMID: 10371528, 19486177, 25735478, 27250579). - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
Eigen
Pathogenic
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
MutationTaster
Benign
A;A;A
Vest4
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at