Total submissions: 3
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Clin |
RCV004813058 | SCV005438080 | likely pathogenic | Alpha-actinopathy | 2024-08-27 | reviewed by expert panel | curation | The c.1074G>T (p.Trp358Cys) variant in ACTA1 is a missense variant predicted to cause substitution of tryptophan by cysteine at amino acid 358. This variant is absent from gnomAD v4.1.0 (PM2_Supporting). The computational predictor REVEL gives a score of 0.957, which is above the threshold of 0.7, evidence that correlates with impact to ACTA1 function (PP3). ACTA1, in which the variant was identified, is defined by the ClinGen Congenital Myopathies VCEP as a gene that has a low rate of benign missense variation and where pathogenic missense variants are a common mechanism of disease (PP2). This variant has been reported in 2 probands, one with nemaline rods in muscle biopsy (as well as dilated cardiomyopathy) and the other an infant with hypotonia (PS4_Supporting, PP4_Moderate; PMID: 23650303, Invitae SCV001393788.5). In summary, this variant meets the criteria to be classified as likely pathogenic for autosomal dominant alpha-actinopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen Congenital Myopathies VCEP: PP4_Moderate, PS4_Supporting, PM2_Supporting, PP2, PP3. (Congenital Myopathies VCEP specifications version 2; 08/27/2024) |
| Labcorp Genetics |
RCV000115017 | SCV001393788 | likely pathogenic | Actin accumulation myopathy | 2023-02-04 | criteria provided, single submitter | clinical testing | In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. 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 not expected to disrupt ACTA1 protein function. ClinVar contains an entry for this variant (Variation ID: 127188). This missense change has been observed in individuals with clinical features of autosomal dominant ACTA1-related conditions (PMID: 23650303; Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tryptophan, which is neutral and slightly polar, with cysteine, which is neutral and slightly polar, at codon 358 of the ACTA1 protein (p.Trp358Cys). |
| OMIM | RCV000115017 | SCV000148926 | pathogenic | Actin accumulation myopathy | 2013-06-01 | no assertion criteria provided | literature only |