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ADCY5-related dyskinesia: Broader spectrum and genotype-phenotype correlations
Dong-Hui Chen1, Aurélie Méneret1, Jennifer R Friedman1
1From the Departments of Neurology (D.-H.C., E.S.B., M.Y.D., P.D.S., M.W., T.D.B.), Psychiatry and Behavioral Sciences (O.K., W.H.R.), Genome Sciences (H.A.S., E.E.E.), Medicine (F.M.H., L.M.A., W.H.R.), and Pathology (M.O.D.), and Howard Hughes Medical Institute (E.E.E.), University of Washington, Seattle; Inserm (A.M., D. Grabli, M.V., O.T., E.R.), U 1127; CNRS (A.M., D. Grabli, M.V., O.T., E.R.), UMR 7225; Sorbonne Université (A.M., D. Grabli, M.V., O.T., E.R.), UPMC Univ Paris 06, UMR S 1127; Institut du Cerveau et de la Moelle Épinière (A.M., D. Grabli, M.V., O.T., E.R.), ICM; Départements de Neurologie (A.M., B.D., D. Grabli, M.V., O.T., E.R.) et de Génétique (C.M.), Hôpital de la Pitié Salpêtrière, AP-HP, Paris, France; the Departments of Neurosciences and Pediatrics (J.R.F.), University of California, San Diego; Rady Childrens Hospital (J.R.F.), San Diego, CA; Tel-Aviv Brill Community Mental Health Center (A.G.), Tel Aviv Medical School, Israel; Service de Neuropédiatrie (D.D.), Hôpital Trousseau, AP-HP; Centre de Référence Mouvements Anormaux de l'Enfant à l'Adulte (D.D.); Centre des Déficiences Intellectuelles de Causes Rares (C.M.), Paris; Département de Neurologie (M.A., C.T.), Hôpital Civil de Strasbourg; Fédération de Médecine Translationnelle de Strasbourg (FMTS) (M.A., C.T.), Université de Strasbourg; Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC) (M.A., C.T.), INSERM-U964/CNRS-UMR7104/Université de Strasbourg, Illkirch, France; Phoenix Children's Hospital (S.B.), AZ; CHU de Bordeaux (N.D.-P.), Explorations Fonctionnelles du Système Nerveux; Service de Neuropédiatrie (D. Gras), Hôpital Robert Debré, AP-HP, Paris, France; Department of Child Neurology (K.M.M.), Lucile Packard Children's Hospital, Stanford University, Palo Alto, CA; Johns Hopkins All Children's Hospital (S.W.), St. Petersburg, FL; The Scripps Translational Science Institute (A.T.), Scripps Health and The Scripps Research Institute, S
Objective:
To investigate the clinical spectrum and distinguishing features of adenylate cyclase 5 (ADCY5)-related dyskinesia and genotype-phenotype relationship.
Methods:
We analyzed ADCY5 in patients with choreiform or dystonic movements by exome or targeted sequencing. Suspected mosaicism was confirmed by allele-specific amplification. We evaluated clinical features in our 50 new and previously reported cases.
Results:
We identified 3 new families and 12 new sporadic cases with ADCY5 mutations. These mutations cause a mixed hyperkinetic disorder that includes dystonia, chorea, and myoclonus, often with facial involvement. The movements are sometimes painful and show episodic worsening on a fluctuating background. Many patients have axial hypotonia. In 2 unrelated families, a p.A726T mutation in the first cytoplasmic domain (C1) causes a relatively mild disorder of prominent facial and hand dystonia and chorea. Mutations p.R418W or p.R418Q in C1, de novo in 13 individuals and inherited in 1, produce a moderate to severe disorder with axial hypotonia, limb hypertonia, paroxysmal nocturnal or diurnal dyskinesia, chorea, myoclonus, and intermittent facial dyskinesia. Somatic mosaicism is usually associated with a less severe phenotype. In one family, a p.M1029K mutation in the C2 domain causes severe dystonia, hypotonia, and chorea. The progenitor, whose childhood-onset episodic movement disorder almost disappeared in adulthood, was mosaic for the mutation.
Conclusions:
ADCY5-related dyskinesia is a childhood-onset disorder with a wide range of hyperkinetic abnormal movements. Genotype-specific correlations and mosaicism play important roles in the phenotypic variability. Recurrent mutations suggest particular functional importance of residues 418 and 726 in disease pathogenesis.
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