ClinVar Miner

Submissions for variant NM_000271.5(NPC1):c.2200A>T (p.Ser734Cys)

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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Labcorp Genetics (formerly Invitae), Labcorp RCV003605321 SCV004454062 likely pathogenic Niemann-Pick disease, type C1 2023-04-07 criteria provided, single submitter clinical testing This variant disrupts the p.Ser734 amino acid residue in NPC1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 12955717, 20718790, 23433426, 26666848). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. 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 expected to disrupt NPC1 protein function. This variant has not been reported in the literature in individuals affected with NPC1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 734 of the NPC1 protein (p.Ser734Cys).

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