Niemann-Pick disease type C: mutations of NPC1 gene and the course of disease

Cvitanović-Šojat, Ljerka; Malenica, Maša; Kukuruzović, Monika; Žigman, Tamara; Kužnik, Kristina; Bielen, Ana

doi:10.13112/pc.2014.45

Cited by 1 publication

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“…NPC is a heterogeneous disorder with two genetic complementation groups [ 12 ]. Accordingly, in approximately 95% of NPC patients, mutations are present in the NPC1 gene (MIM 607623) and the remaining patients have mutations in the NPC2 gene (MIM 601015) [ 13 ]. The NPC1 gene has 25 exons spanning more than 47 kb in length and is located on chromosome 18q11 [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Identification of novel mutations among Iranian NPC1 patients: a bioinformatics approach to predict pathogenic mutations

et al. 2022

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Background Niemann-Pick disease type C (NPC) is a rare lysosomal neurovisceral storage disease caused by mutations in the NPC 1 (95%) or NPC2 (5%) genes. The products of NPC1 and NPC2 genes play considerable roles in glycolipid and cholesterol trafficking, which could consequently lead to NPC disease with variable phenotypes displaying a broad spectrum of symptoms. Materials In the present study 35 Iranian NPC unrelated patients were enrolled. These patients were first analysed by the Filipin Staining test of cholesterol deposits in cells for NPC diagnostics. Genomic DNA was extracted from the samples of peripheral blood leukocytes in EDTA following the manufacturer's protocol. All exon–intron boundaries and coding exons of the NPC1gene were amplified by polymerase chain reaction (PCR) using appropriate sets of primers. Thereafter, the products of PCR were sequenced and analysed using the NCBI database (https://blast.ncbi.nlm.nih.gov/Blast.cgi). The variants were reviewed by some databases including the Human Gene Mutation Database (HGMD) (http://www.hgmd.cf.ac.uk/ac/index.php) and ClinVar (https://www.ncbi.nlm.nih.gov/clinvar (. Moreover, all the variants were manually classified in terms of the American College of Medical Genetics and Genomics (ACMG) guideline. Results The sequence analysis revealed 20 different variations, 10 of which are new, including one nonsense mutation (c.406C > T); three small deletions, (c.3126delC, c.2920_2923delCCTG, and c.2037delG); and six likely pathogenic missense mutations, (c.542C > A, c.1970G > A, c.1993C > G, c.2821 T > C, c.2872C > G, and c.3632 T > A). Finally, the pathogenicity of these new variants was determined using the ACMG guidelines. Conclusion The present study aimed to facilitate the prenatal diagnosis of NPC patients in the future. In this regard, we identified 10 novel mutations, and verified that the majority of them occurred in six NPC1 exons (5, 8, 9, 13, 19, and 21), that should be considered with a high priority for Iranian patients' cost-effective evaluation.

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Section: Introductionmentioning

confidence: 99%