ClinVar Miner

Submissions for variant NM_000546.6(TP53):c.946C>A (p.Pro316Thr)

gnomAD frequency: 0.00001  dbSNP: rs772773208
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Total submissions: 4
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
ClinGen TP53 Variant Curation Expert Panel, ClinGen RCV001723802 SCV001949918 uncertain significance Li-Fraumeni syndrome 1 2021-04-05 reviewed by expert panel curation This variant has a BayesDel score < 0.16 and Align GVGD (Zebrafish) is Class C0 (BP4). In summary, the clinical significance of TP53 c.946C>A (p.Pro316Thr) is uncertain for Li-Fraumeni syndrome. ACMG/AMP criteria applied, as specified by the TP53 Variant Curation Expert Panel: BP4.
Ambry Genetics RCV000215470 SCV000273916 uncertain significance Hereditary cancer-predisposing syndrome 2022-10-18 criteria provided, single submitter clinical testing The p.P316T variant (also known as c.946C>A), located in coding exon 8 of the TP53 gene, results from a C to A substitution at nucleotide position 946. The proline at codon 316 is replaced by threonine, an amino acid with highly similar properties. This variant is reported to have non-functional transactivation in yeast based assays (Kato S et al. Proc. Natl. Acad. Sci. USA. 2003 Jul;100:8424-9). Studies conducted in human cell lines indicate this alteration has no dominant negative effect or loss of function (Giacomelli AO et al. Nat. Genet. 2018 Oct;50:1381-1387). This amino acid position is not well conserved in available vertebrate species, and threonine is the reference amino acid in other 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.
GeneDx RCV000235672 SCV000294080 uncertain significance not provided 2023-05-25 criteria provided, single submitter clinical testing Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Published functional studies are conflicting: a yeast-based assay demonstrates non-functional transactivation, while an assay in human cell lines exhibits no dominant negative effect over wildtype p53 (Kato et al., 2003; Giacomelli et al., 2018); This variant is associated with the following publications: (PMID: 12826609, 30224644, Pessoa2014[Chapter], 2247074, 30661751)
Invitae RCV000467467 SCV000545286 uncertain significance Li-Fraumeni syndrome 2023-12-07 criteria provided, single submitter clinical testing This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 316 of the TP53 protein (p.Pro316Thr). This variant is present in population databases (rs772773208, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with TP53-related conditions. ClinVar contains an entry for this variant (Variation ID: 230382). Advanced modeling performed at Invitae incorporating data from internal and/or published experimental studies (PMID: 12826609, 29979965, 30224644) indicates that this missense variant is expected to disrupt TP53 function with a positive predictive value of 97.5%. Studies have shown that this missense change alters TP53 gene expression (PMID: 12826609). 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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