Abstract
Background
Niemann Pick type C is an autosomal recessive lysosomal storage disorder caused by mutations in NPC1 and NPC2 genes. It is a neuro-visceral disease with a heterogeneous phenotype. Clinical features depend on the age at onset. Visceral manifestations are more prominent in the early onset (infantile) form, while neuro-psychiatric symptoms are more prominent in the late disease onset (juvenile and adult forms).
Methods
A total number of 150 patients have been screened for changes in NPC1 and NPC2 gene at the Neurology Clinic, University Clinical Centre of Serbia in the period 2012–2020. Clinical data were extracted for patients with biallelic mutations.
Results
Fifteen patients carried biallelic mutations in the NPC1. Out of eight different reported NPC1 variants, four are novel (c.1204_1205TT>GC, p.F402A; c.2486T>G, p.L829R; c.2795+5 G>C; c.3722T>A, p.L1241*). The mean age at the disease onset was 20.3 ± 11.9 years with the average diagnostic delay of 7.7 ± 4.3 years. Movement disorders and psychiatric or cognitive disturbances were the most common initial symptoms (in 33% and 28% patients, respectively). The average age at the first neurological manifestation was 21 ± 12.0 years. At the last examination, eye movement abnormalities (vertical slow saccades or vertical supranuclear gaze palsy), and ataxia were present in all patients, while dystonia was common (in 78.6% of patients). Presence of c.2861C>T, p.S954L mutation in homozygous state was associated with older age at the neurological symptom onset.
Conclusions
Clinical findings were in line with the expected, but the diagnostic delay was common. We hypothesize that the presence of c.2861C>T, p.S954L mutation may contribute to the phenotype attenuation.
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Funding
This study was supported by the Ministry of Education and Science of the Republic of Serbia (Grant #175090 to VK).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by AT, IgP, ND, IvP, AM, MB, MJ, IN, MS, VSK. The first draft of the manuscript was written by NK, VD and MJL. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Nikola Kresojević and Marina Svetel have received speaker honoraria from Actavis. Igor Petrović has received speaker honoraria from Actavis and Salveo. Vladimir S. Kostić has received speaker honoraria from Roche and Alkaloid and receives research supports from the Swiss Pharm and Serbian Ministry of Education, Science, and Development and Serbian Academy of Sciences and Art. Valerija Dobričić, Milica Ječmenica Lukić, Aleksandra Tomić, Nataša Dragašević, Ivana Perović, Ana Marjanović, Marija Branković, Milena Janković, Ivana Novaković: report no disclosures.
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This study was approved by the Local Ethics Committees on human studies and has, therefore, been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All patients/caregivers provided written informed consent prior to study participation.
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Kresojević, N., Dobričić, V., Lukić, M.J. et al. Genetic and phenotypic variability in adult patients with Niemann Pick type C from Serbia: single-center experience. J Neurol 269, 3167–3174 (2022). https://doi.org/10.1007/s00415-021-10918-7
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DOI: https://doi.org/10.1007/s00415-021-10918-7