Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Women's Health and Genetics/Laboratory Corporation of America, |
RCV001192894 | SCV001361339 | uncertain significance | not specified | 2019-09-12 | criteria provided, single submitter | clinical testing | Variant summary: DNA2 c.193C>T (p.Arg65Cys) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.4e-05 in 280338 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.193C>T in individuals affected with Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal dominant 6 and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. |
| Labcorp Genetics |
RCV002560157 | SCV003282740 | uncertain significance | not provided | 2024-02-06 | criteria provided, single submitter | clinical testing | This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 65 of the DNA2 protein (p.Arg65Cys). This variant is present in population databases (rs540241779, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with DNA2-related conditions. ClinVar contains an entry for this variant (Variation ID: 928658). 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 DNA2 protein function with a negative predictive value of 80%. 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. |