Intraputaminal Gene Delivery in Two Patients with Aromatic L‐Amino Acid Decarboxylase Deficiency

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François-Heude, Marie‐céline | Poulen, Gaetan | Flamand Roze, Emmanuel | Nguyen Morel, Marie‐ange | Gras, Domitille | Roch-Toreilles, Isabelle | Quintard, Adeline | Baroux, Gaelle | Meyer, Pierre | Coubes, Philippe | Milesi, Christophe | Cambonie, Gilles | Baleine, Julien | Sola, Chrystelle | Delye, Bénédicte | Dimopoulou, Evgenia | Sanchez, Stéphanie | Gasnier, Mathieu | Touati, Souad | Zamora, Alberto | Pontal, Daniel | Leboucq, Nicolas | Kouyoumdjian, Virginie | Lebasnier, Adrien | Sanquer, Sylvia | Mariano-Goulart, Denis | Roujeau, Thomas | Roubertie, Agathe

Edité par CCSD ; Wiley -

International audience. Background: Aromatic l-amino acid decarboxylase deficiency (AADCD) is a rare, early-onset, dyskinetic encephalopathy mostly reflecting a defective synthesis of brain dopamine and serotonin. Intracerebral gene delivery (GD) provided a significant improvement among AADCD patients (mean age, ≤6 years).Objective: We describe the clinical, biological, and imaging evolution of two AADCD patients ages >10 years after GD.Methods: Eladocagene exuparvovec, a recombinant adeno-associated virus containing the human complimentary DNA encoding the AADC enzyme, was administered into bilateral putamen by stereotactic surgery.Results: Eighteen months after GD, patients showed improvement in motor, cognitive and behavioral function, and in quality of life. Cerebral l-6-[18F] fluoro-3, 4-dihydroxyphenylalanine uptake was increased at 1 month, persisting at 1 year compared to baseline.Conclusion: Two patients with a severe form of AADCD had an objective motor and non-motor benefit from eladocagene exuparvovec injection even when treated after the age of 10 years, as in the seminal study.

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