Evaluation of a New Strategy for the Diagnosis of Peroxisomal Diseases

Inclusion Criteria: I - CLINICAL/BIOLOGICAL CRITERIA For an efficient screening of the patients of the 4 contributing University Hospitals (Amiens, Caen, Lille and Rouen), various inclusion criteria were selected: In general, the inclusion criterion is the existence of a positive biology or in turn the persistence of a clinical suspicion in spite of a negative biology. I A - Children from 0 to 17 years: The clinical inclusion criterion is a positive biology or the persistence of a clinical suspicion in spite of a negative biology. This persistent clinical suspicion is left to the discretion of the clinician. It is essentially based on the existence of a family history of peroxisomal (or suspected) pathology and / or the combination of several clinical signs of craniofacial dysmorphism, skeletal abnormalities, encephalopathy (seizures, ataxia, Hypotonia), demyelinating peripheral neuropathy, ophthalmopathy (retinopathy, cataract), hepatic impairment (hyperbilirubinemia, hepatomegaly, cholestasis) and growth retardation OR I B - Adults from 18 years The neurological symptoms of peroxisomal diseases in adulthood are numerous and non-specific. The three inclusion criteria selected for patient selection are as follows: * Cognitive impairment (delayed acquisition or regression) and / or leukodystrophy AND At least one of the following signs: Cerebellar ataxia, Spastic paraparesis, Peripheral neuropathy, Neurosensory deafness, Retinitis pigmentosa, Epilepsy, Unexplained unexplained vigilance, Peripheral corticotropic insufficiency +/- gonadotropic AND * no evidence for an extraperoxisomal origin of the patient disease stated after the usual paraclinic explorations II - NON CLINICAL CRITERIA * Social insurances * Having understood the information note and having signed the informed consent form. * Patients under guardianship or curatorship may be included, since peroxisomal diseases as a cause of neurological impairment may potentially lead to guardianship. Exclusion Criteria: * Pregnant or nursing women * Person deprived of liberty or in emergency situations