Evaluation of in Vitro NMR Spectroscopy to Identify Inborn Errors of Metabolism in Patients With Complex Neurological Diseases

It is now established that most inborn errors of metabolism may present in adulthood as a neurological disorder. The diagnosis of these diseases is essential because, unlike the so-called neurodegenerative diseases, metabolic diseases are often accessible to specific treatments.

Conversely, many patients are followed for a complex neurological disease of unknown cause. We hypothesize that a significant proportion of these patients carry yet undetected inborn error of metabolism.

Recently, the use of Nuclear magnetic resonance spectroscopy (NMRS) has uncovered new metabolic diseases leading sometimes to specific treatments. However, the place of this technique in the investigation of patients with complex neurological diseases remains to be determined.

The primary goal of this project is to assess the interest of NMRS in urine and CSF to search metabolic abnormalities, not detected by conventional biochemical techniques. It is an open study. The study will be conducted in close collaboration between the neurology and genetic departments of the Pitié-Salpêtrière hospital, on the one hand and the nuclear medicine department of Poitiers in the other. 250 patients will be included over a period of 2-3 years and will be divided into 4 groups: Group 1: patients with complex neurological disease of unknown cause (200 patients) for whom urines and CSF will be collected. Group 2: positive controls (25 patients): patients with already known metabolic disease for whom we already have CSF or urines. Group 3: negative controls (25 patients): patients with non metabolic neurological disorders of known cause hospitalized for a lumbar puncture.