Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Gene |
RCV001575576 | SCV001802601 | pathogenic | not provided | 2020-12-11 | criteria provided, single submitter | clinical testing | Located in the highly conserved Gly-X-Y repeat of the collagenous domain; Glycine substitution variants in this region of the COLVII protein destabilize the collagen triple helix resulting in skin fragility due to poor anchoring of the basement membrane to the underlying dermis (Pfendner and Lucky, 2018); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Has not been previously published as pathogenic or benign to our knowledge |
| Labcorp Genetics |
RCV001575576 | SCV003508731 | uncertain significance | not provided | 2022-09-27 | criteria provided, single submitter | clinical testing | This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1495 of the COL7A1 protein (p.Gly1495Val). This variant is present in population databases (no rsID available, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with COL7A1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1207555). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C65"). This variant disrupts the triple helix domain of COL7A1. Glycine residues within the Gly-Xaa-Yaa repeats of the triple helix domain are required for the structure and stability of fibrillar collagens (PMID: 7695699, 8218237, 19344236), and variants at these glycine residues in COL7A1 are more frequently observed in individuals with disease than in the general population (PMID: 22058051). However, the clinical significance of this observation remains uncertain since only a limited number of affected individuals have been described to date. 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. |