ClinVar Miner

Submissions for variant NM_000543.5(SMPD1):c.1280A>T (p.His427Leu)

dbSNP: rs794727629
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Eurofins Ntd Llc (ga) RCV000178119 SCV000230120 uncertain significance not provided 2014-10-24 criteria provided, single submitter clinical testing
Labcorp Genetics (formerly Invitae), Labcorp RCV001852206 SCV002287363 likely pathogenic Niemann-Pick disease, type B; Niemann-Pick disease, type A 2023-12-19 criteria provided, single submitter clinical testing This sequence change replaces histidine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 427 of the SMPD1 protein (p.His427Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SMPD1-related conditions. ClinVar contains an entry for this variant (Variation ID: 197160). 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 SMPD1 protein function with a positive predictive value of 95%. This variant disrupts the p.His427 amino acid residue in SMPD1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 20386867, 25144372). 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.

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