Transcriptomic Analysis of Fibroblasts and Blood in Patients With Rare Diseases

Inclusion Criteria: * Male or female, aged 0-99 years * Patient with neonatal intellectual disability and/or hypotonia followed at one of three inclusion centers * Patient or parent has been informed about the study and has signed an informed consent form * Genetic analysis by high-throughput DNA sequencing (gene panel, exome, genome) did not identify any abnormality explaining the patient's phenotype. * If the patient's phenotype is suggestive of Prader-Willi syndrome or Angelman syndrome: a methylation anomaly test on chromosome 15 was negative. * If the patient's phenotype is suggestive of fragile X syndrome: a repeat expansion analysis of the FMR1 gene was negative. * If the patient's phenotype is suggestive of myotonic dystrophy type I, DM1: a repeat expansion analysis of the DMPK gene was negative. * Patient entitled to or beneficiary of a social security scheme Exclusion Criteria: * Patient deprived of liberty * Pregnant or breast-feeding woman, * The person required to sign the consent form does not understand French * Person under guardianship and/or curatorship