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Dev Med Child Neurol. 2017 Aug;59(8):815-821. doi: 10.1111/dmcn.13473. Epub 2017 May 25.

Phenotype and natural history of variant late infantile ceroid-lipofuscinosis 5.

Author information

1
Department of Neuroscience, Biomedicine, Movement - Neurology (Child Neurology and Psychiatry, and Neuropathology), University of Verona, Verona, Italy.
2
Children's Neurosciences Centre, Guy's and St Thomas' NHS Foundation Trust, London, UK.
3
Department of Developmental Neuroscience and Molecular Neurogenetics, IRCCS Foundation Neurological Institute C Besta, Milan, Italy.
4
Department of Child Neurology, Helsinki University Central Hospital, Peijas Hospital, HUCH, Helsinki, Finland.
5
Molecular Medicine Unit and Child Neurology, IRCCS Fondazione Stella Maris, Pisa, Italy.
6
Department of Paediatrics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Abstract

AIM:

To characterize the phenotypic profile of a cohort of children affected with CLN5, a rare form of neuronal ceroid-lipofuscinosis (NCL), and to trace the features of the natural history of the disease.

METHOD:

Records of 15 children (nine males, six females) were obtained from the data sets of the DEM-CHILD International NCL Registry. Disease progression was measured by rating six functional domains at different time points along the disease course. All patients underwent mutation analysis of the CLN5 gene and ultrastructural investigations of peripheral tissues. Expression of the gene product, pCLN5, was characterized in vitro in six patients.

RESULTS:

Disease onset was at 2 to 7 years 6 months of age: impaired learning and cognition were the most common early symptoms. Seizures occurred relatively late (median age 8y) and were the presenting symptoms in two children. Nine mutations were detected in 30 alleles, including six mutations predicting a truncated protein. Mixed cytosomes were observed by electron microscopy. Differences of disease progression were observed in two groups of patients and could be related to their genetic profile.

INTERPRETATION:

Clinical features in a multicentre cohort of patients with CLN5 confirm that cognitive difficulties are early clinical markers of this condition. Severe mutations were associated with a more rapid decline of neurological function.

PMID:
28542837
DOI:
10.1111/dmcn.13473
[Indexed for MEDLINE]
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