ClinVar Miner

Submissions for variant NM_000321.3(RB1):c.74C>T (p.Pro25Leu)

dbSNP: rs1593412158
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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 RCV001026505 SCV001188900 uncertain significance Hereditary cancer-predisposing syndrome 2023-04-25 criteria provided, single submitter clinical testing The p.P25L variant (also known as c.74C>T), located in coding exon 1 of the RB1 gene, results from a C to T substitution at nucleotide position 74. The proline at codon 25 is replaced by leucine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.
Invitae RCV001862369 SCV002225871 uncertain significance Retinoblastoma 2022-10-05 criteria provided, single submitter clinical testing This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 25 of the RB1 protein (p.Pro25Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with RB1-related conditions. ClinVar contains an entry for this variant (Variation ID: 827087). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0". The leucine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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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