AADCdeficiency from infancy to adulthood: Symptoms and developmental outcome in an international cohort of 63 patients

Aromaticl-amino acid decarboxylase deficiency (AADCD) is a rare, autosomal recessive neurodevelopmental disorder characterized by impaired synthesis of dopamine, noradrenaline, adrenaline and serotonin, leading to a complex syndrome of motor, behavioral, and autonomic symptoms. This retrospective st...

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Main Authors: Pearson, Toni S. (Author) , Gilbert, Laura (Author) , Opladen, Thomas (Author) , Garcia-Cazorla, Angeles (Author) , Mastrangelo, Mario (Author) , Leuzzi, Vincenzo (Author) , Tay, Stacy K. H. (Author) , Sykut-Cegielska, Jolanta (Author) , Pons, Roser (Author) , Mercimek-Andrews, Saadet (Author) , Kato, Mitsuhiro (Author) , Luecke, Thomas (Author) , Oppeboen, Mari (Author) , Kurian, Manju A. (Author) , Steel, Dora (Author) , Manti, Filippo (Author) , Meeks, Kathleen D. (Author) , Jeltsch, Kathrin (Author) , Flint, Lisa (Author)
Format: Article (Journal)
Language:English
Published: Sept 2020
In: Journal of inherited metabolic disease
Year: 2020, Volume: 43, Issue: 5, Pages: 1121-1130
ISSN:1573-2665
DOI:10.1002/jimd.12247
Online Access:Resolving-System, Volltext: https://doi.org/10.1002/jimd.12247
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Author Notes:Toni S. Pearson, Laura Gilbert, Thomas Opladen, Angeles Garcia-Cazorla, Mario Mastrangelo, Vincenzo Leuzzi, Stacy K.H. Tay, Jolanta Sykut-Cegielska, Roser Pons, Saadet Mercimek-Andrews, Mitsuhiro Kato, Thomas Luecke, Mari Oppeboen, Manju A. Kurian, Dora Steel, Filippo Manti, Kathleen D. Meeks, Kathrin Jeltsch, Lisa Flint

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520 |a Aromaticl-amino acid decarboxylase deficiency (AADCD) is a rare, autosomal recessive neurodevelopmental disorder characterized by impaired synthesis of dopamine, noradrenaline, adrenaline and serotonin, leading to a complex syndrome of motor, behavioral, and autonomic symptoms. This retrospective study assessed the symptoms and developmental outcome of a large international cohort of patients with AADCD via physician and/or caregiver responses to a detailed, standardized questionnaire. Sixty-three patients (60% female; ages 6 months-36 years, median 7 years; 58 living) from 23 individual countries participated. Common symptoms at onset (median age 3 months, range 0-12 months) were hypotonia, developmental delay, and/or oculogyric crises. Oculogyric crises were present in 97% of patients aged 2 to 12 years, occurred in the majority of patients in all age groups, and tended to be most severe during early childhood. Prominent non-motor symptoms were sleep disturbance, irritable mood, and feeding difficulties. The majority of subjects (70%) had profound motor impairment characterized by absent head control and minimal voluntary movement, while 17% had mild motor impairment and were able to walk independently. Dopamine agonists were the medications most likely to produce some symptomatic benefit, but were associated with dose-limiting side effects (dyskinesia, insomnia, irritability, vomiting) that led to discontinuation 25% of the time. The age distribution of our cohort (70% of subjects under age 13 years) and the observation of a greater proportion of patients with a more severe disease phenotype in the younger compared to the older patients, both suggest a significant mortality risk during childhood for patients with severe disease. 
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