ClinVar Miner

Submissions for variant NM_000038.6(APC):c.718A>G (p.Thr240Ala)

gnomAD frequency: 0.00001  dbSNP: rs986809285
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000571481 SCV000667558 uncertain significance Hereditary cancer-predisposing syndrome 2021-04-30 criteria provided, single submitter clinical testing The p.T240A variant (also known as c.718A>G), located in coding exon 6 of the APC gene, results from an A to G substitution at nucleotide position 718. The threonine at codon 240 is replaced by alanine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species, and alanine is the reference amino acid in other vertebrate species. In addition, in silico predictors for this gene do not accurately predict pathogenicity. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.
Invitae RCV003767145 SCV001541432 uncertain significance Familial adenomatous polyposis 1 2023-09-12 criteria provided, single submitter clinical testing This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 240 of the APC protein (p.Thr240Ala). 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 APC-related conditions. ClinVar contains an entry for this variant (Variation ID: 482347). 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 APC 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.

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