ClinVar Miner

Submissions for variant NM_014363.6(SACS):c.5930A>G (p.Lys1977Arg) (rs774492331)

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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Illumina Clinical Services Laboratory,Illumina RCV000350600 SCV000383347 uncertain significance Charlevoix-Saguenay spastic ataxia 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Invitae RCV000550324 SCV000629473 uncertain significance Spastic paraplegia 2017-06-16 criteria provided, single submitter clinical testing This sequence change replaces lysine with arginine at codon 1977 of the SACS protein (p.Lys1977Arg). The lysine residue is moderately conserved and there is a small physicochemical difference between lysine and arginine. This variant is present in population databases (rs774492331, ExAC 0.02%). This variant has not been reported in the literature in individuals with a SACS-related disease. ClinVar contains an entry for this variant (Variation ID: 311538). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, this variant has uncertain impact on SACS function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

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