Total submissions: 2
| Submitter | RCV | SCV | Clinical significance | Condition | Last evaluated | Review status | Method | Comment |
|---|---|---|---|---|---|---|---|---|
| Ambry Genetics | RCV000561376 | SCV000675012 | uncertain significance | Hereditary cancer-predisposing syndrome | 2016-07-08 | criteria provided, single submitter | clinical testing | The p.K397R variant (also known as c.1190A>G), located in coding exon 9 of the SDHA gene, results from an A to G substitution at nucleotide position 1190. The lysine at codon 397 is replaced by arginine, an amino acid with highly similar properties. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. To date, this alteration has been detected with an allele frequency of approximately 0.005% (greater than 20000 alleles tested) in our clinical cohort. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. |
| Labcorp Genetics |
RCV001853800 | SCV002166173 | uncertain significance | Mitochondrial complex II deficiency, nuclear type 1; Paragangliomas 5 | 2023-07-17 | criteria provided, single submitter | clinical testing | This variant has not been reported in the literature in individuals affected with SDHA-related conditions. This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 397 of the SDHA protein (p.Lys397Arg). This variant is not present in population databases (gnomAD no frequency). ClinVar contains an entry for this variant (Variation ID: 486390). 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 SDHA protein function. 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. |