chr1-201048579-C-T
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Variant summary
Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate
The NM_000069.3(CACNA1S):c.4441+3G>A variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000187 in 1,607,462 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 (★★).
Frequency
Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)
Exomes 𝑓: 0.000019 ( 0 hom. )
Consequence
CACNA1S
NM_000069.3 splice_donor_region, intron
NM_000069.3 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.0007630
2
Clinical Significance
Conservation
PhyloP100: -0.251
Genes affected
CACNA1S (HGNC:1397): (calcium voltage-gated channel subunit alpha1 S) This gene encodes one of the five subunits of the slowly inactivating L-type voltage-dependent calcium channel in skeletal muscle cells. Mutations in this gene have been associated with hypokalemic periodic paralysis, thyrotoxic periodic paralysis and malignant hyperthermia susceptibility. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 0 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.34).
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CACNA1S | NM_000069.3 | c.4441+3G>A | splice_donor_region_variant, intron_variant | ENST00000362061.4 | |||
CACNA1S | XM_005245478.4 | c.4384+3G>A | splice_donor_region_variant, intron_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CACNA1S | ENST00000362061.4 | c.4441+3G>A | splice_donor_region_variant, intron_variant | 1 | NM_000069.3 | P2 |
Frequencies
GnomAD3 genomes AF: 0.0000131 AC: 2AN: 152246Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.0000119 AC: 3AN: 251178Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135786
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GnomAD4 exome AF: 0.0000192 AC: 28AN: 1455098Hom.: 0 Cov.: 31 AF XY: 0.0000193 AC XY: 14AN XY: 724268
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GnomAD4 genome AF: 0.0000131 AC: 2AN: 152364Hom.: 0 Cov.: 33 AF XY: 0.0000134 AC XY: 1AN XY: 74498
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:7
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Hypokalemic periodic paralysis, type 1 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 13, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Malignant hyperthermia, susceptibility to, 5;C2749982:Thyrotoxic periodic paralysis, susceptibility to, 1;C3714580:Hypokalemic periodic paralysis, type 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Jan 05, 2022 | - - |
Congenital myopathy 18 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Thyrotoxic periodic paralysis, susceptibility to, 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Malignant hyperthermia, susceptibility to, 5;C3714580:Hypokalemic periodic paralysis, type 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jun 27, 2022 | 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. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. ClinVar contains an entry for this variant (Variation ID: 294717). This variant has not been reported in the literature in individuals affected with CACNA1S-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.003%). This sequence change falls in intron 36 of the CACNA1S gene. It does not directly change the encoded amino acid sequence of the CACNA1S protein. It affects a nucleotide within the consensus splice site. - |
Malignant hyperthermia, susceptibility to, 5 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Computational scores
Source:
Name
Calibrated prediction
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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dbscSNV1_ADA
Benign
dbscSNV1_RF
Benign
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at