Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2
The NM_000719.7(CACNA1C):c.3948C>T(p.Asn1316=) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000378 in 1,613,902 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).
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]
Computational evidence support a benign effect (BayesDel_noAF=-0.42).
BP6
Variant 12-2651642-C-T is Benign according to our data. Variant chr12-2651642-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 308150.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-2651642-C-T is described in Lovd as [Likely_benign].
BP7
Synonymous conserved (PhyloP=-0.561 with no splicing effect.
BS1
Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000223 (34/152250) while in subpopulation SAS AF= 0.00603 (29/4810). AF 95% confidence interval is 0.00431. There are 1 homozygotes in gnomad4. There are 23 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.
This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Long QT syndrome Benign:1
Benign, criteria provided, single submitter
clinical testing
Invitae
Jan 27, 2024
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Cardiovascular phenotype Benign:1
Likely benign, criteria provided, single submitter
clinical testing
Ambry Genetics
Feb 10, 2017
This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -