Gain-of-function ADCY5 mutations in familial dyskinesia with facial myokymia

Ying Zhang Chen, Jennifer R. Friedman, Dong Hui Chen, Guy C.K. Chan, Cinnamon S. Bloss, Fuki M. Hisama, Sarah E. Topol, Andrew R. Carson, Phillip H. Pham, Emily S. Bonkowski, Erick R. Scott, Janel K. Lee, Guangfa Zhang, Glenn Oliveira, Jian Xu, Ashley A. Scott-Van Zeeland, Qi Chen, Samuel Levy, Eric J. Topol, Daniel StormPhillip D. Swanson, Thomas D. Bird, Nicholas J. Schork, Wendy H. Raskind, Ali Torkamani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Objective To identify the cause of childhood onset involuntary paroxysmal choreiform and dystonic movements in 2 unrelated sporadic cases and to investigate the functional effect of missense mutations in adenylyl cyclase 5 (ADCY5) in sporadic and inherited cases of autosomal dominant familial dyskinesia with facial myokymia (FDFM). Methods Whole exome sequencing was performed on 2 parent-child trios. The effect of mutations in ADCY5 was studied by measurement of cyclic adenosine monophosphate (cAMP) accumulation under stimulatory and inhibitory conditions. Results The same de novo mutation (c.1252C>T, p.R418W) in ADCY5 was found in both studied cases. An inherited missense mutation (c.2176G>A, p.A726T) in ADCY5 was previously reported in a family with FDFM. The significant phenotypic overlap with FDFM was recognized in both cases only after discovery of the molecular link. The inherited mutation in the FDFM family and the recurrent de novo mutation affect residues in different protein domains, the first cytoplasmic domain and the first membrane-spanning domain, respectively. Functional studies revealed a statistically significant increase in β-receptor agonist-stimulated intracellular cAMP consistent with an increase in adenylyl cyclase activity for both mutants relative to wild-type protein, indicative of a gain-of-function effect. Interpretation FDFM is likely caused by gain-of-function mutations in different domains of ADCY5 - the first definitive link between adenylyl cyclase mutation and human disease. We have illustrated the power of hypothesis-free exome sequencing in establishing diagnoses in rare disorders with complex and variable phenotype. Mutations in ADCY5 should be considered in patients with undiagnosed complex movement disorders even in the absence of a family history. Ann Neurol 2014;75:542-549

Original languageEnglish (US)
Pages (from-to)542-549
Number of pages8
JournalAnnals of neurology
Volume75
Issue number4
DOIs
StatePublished - Apr 2014

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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