Teams from the AP-HP Paris public hospitals network, in collaboration with researchers from the Brain & Spine Institute (ICM) (Inserm/CNRS/UPMC), and Metafora biosystems, a start-up with links to the CNRS, have recently developed a diagnostic blood test for a rare but treatable condition called De Vivo disease.
It was tested on 30 patients with the disease, which causes neurological deficits such as epilepsy and movement disorders.
Compared with current diagnostic tests that use an invasive procedure (lumbar puncture) or complex DNA analysis, this new test, the results of which have been published in Annals of Neurology, will be able to screen for the condition rapidly (within 48h) and with ease in both adults and children.
De Vivo disease or glucose transporter type 1 deficiency syndrome (GLUT1-DS) is most often characterized by developmental delay, epilepsy and/or movement disorders in children. Formes frustres have been described in children (abnormal movement episodes) but also in adults. On the basis of an estimated prevalence of 1/83,000 in the Danish population, the number of those affected in the French population is thought to be 800, a little over one hundred of whom will be diagnosed. Once diagnosed, metabolic therapies are available to alleviate the symptoms.
Dr Fanny Mochel from AP-HP Pitié-Salpêtrière University Hospital, along with teams from other hospitals of the AP-HP network (Bichat, Raymond-Poincaré and Robert-Debré) and the Brain & Spine Institute (Inserm/CNRS/UPMC), have developed a simple and rapid (within 48h) diagnostic blood test for De Vivo in collaboration with Metafora biosystems. Current diagnosis is restrictive because it involves an invasive procedure (lumbar puncture) and complex genetic analysis.
Backed by these results, the researchers recommend the use of this new test in routine clinical practice in all neuropediatric and neurology departments. They suggest that its simplicity should enable more patients to be diagnosed in France.
Thanks to this innovative novel blood test, it will be possible to screen for the disease in all patients presenting with cognitive impairment, movement disorders, epilepsy or a combination of the three. The therapies at our disposal can considerably improve symptoms, including, for example, the control of epileptic seizures. However, since these are more effective when started early, timely diagnosis of the condition is crucial.
 Protected by patent CNRS WO2004/096841.
 When patients do not present all the characteristic symptoms of a disease or when such symptoms are mild
  Larsen J, et al. The role of SLC2A1 mutations in myoclonic astatic epilepsy and absence epilepsy, and the estimated frequency of GLUT1 deficiency syndrome. Epilepsia. 2015 Dec;56(12):e203-8.
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A simple blood test expedites the diagnosis of GLUT1 deficiency syndrome Domitille Gras (1), Christelle Cousin (2), Caroline Kappeler (3), Cheuk-Wing Fung (4), Stéphane Auvin (1,5), Nouha Essid (6), Brian Hy Chung (4), Lydie Da Costa (7,8), Elodie Hainque (3,9), Marie-Pierre Luton (3), Vincent Petit (2), Sandrine Vuillaumier-Barrot (10), Odile Boespflug-Tanguy (1), Emmanuel Roze (3,9), Fanny Mochel (3,11,12) (1) APHP, Robert-Debré University Hospital, Department of Paediatric Neurology and Metabolic Diseases, Paris, France (2) Metafora Biosystems, Evry, France (3) Inserm U 1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière, ICM, Paris, France (4) Queen Mary Hospital, Department of Pediatrics and Adolescent Medicine, Hong-Kong (5) Inserm U 1141, Université Paris Diderot, Sorbonne Paris Cité, DHU Protect, Paris, France (6) APHP, Raymond-Poincaré Hospital, Department of Neuropediatrics, Paris, France (7) APHP, Robert-Debré University Hospital, Laboratory of Hematology, Paris, France (8) Inserm U 1134; LABEX Gr-Ex ; Université Paris Diderot, Paris, France (9) APHP, Pitié-Salpêtrière University Hospital, Department of Neurology, Paris, France (10) AP-HP, Bichat-Claude Bernard Hospital, Biochemistry and Genetic Laboratory, Paris, France (11) APHP, Pitié-Salpêtrière University Hospital, Department of Genetics, Paris, France (12) University Pierre and Marie Curie, Neurometabolic Research Group, Paris, France Annals of Neurology, 25 mai 2017 DOI : 10.1002/ana.24970