2. Academic Validation
  3. A homozygous loss-of-function mutation in PDE2A associated to early-onset hereditary chorea

A homozygous loss-of-function mutation in PDE2A associated to early-onset hereditary chorea

  • Mov Disord. 2018 Mar;33(3):482-488. doi: 10.1002/mds.27286.
Vincenzo Salpietro 1,  Belen Perez-Dueñas 2,  Kosuke Nakashima 3,  Victoria San Antonio-Arce 4,  Andreea Manole 1,  Stephanie Efthymiou 1,  Jana Vandrovcova 1,  Conceicao Bettencourt 1,  Niccolò E Mencacci 1 5,  Christine Klein 6,  Michy P Kelly 7,  Ceri H Davies 3,  Haruhide Kimura 3,  Alfons Macaya 8,  Henry Houlden 1
Affiliations

Affiliations

  • 1 Department of Molecular Neuroscience, University College of London, London, United Kingdom.
  • 2 Department of Pediatric Neurology, Hospital Universitari Sant Joan de Déu, Barcelona, Spain.
  • 3 CNS Drug Discovery Unit, Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Japan.
  • 4 Unit of Epilepsy, Sleep and Neurophysiology, Hospital Universitari Sant Joan de Déu, Barcelona, Spain.
  • 5 Center for Genetic Medicine, Feinberg school of medicine, Northwestern University, Chicago, Illinois, USA.
  • 6 Institute of Neurogenetics, University of Lübeck, Lübeck, Germany.
  • 7 Department of Pharmacology, Physiology and Neuroscience, School of Medicine, University of South Carolina, Columbia, South Carolina, USA.
  • 8 Department of Pediatric Neurology, University Hospital Vall d'Hebron, Barcelona, Spain.
PMID: 29392776 DOI: 10.1002/mds.27286
Abstract

Background: We investigated a family that presented with an infantile-onset chorea-predominant movement disorder, negative for NKX2-1, ADCY5, and PDE10A mutations.

Methods: Phenotypic characterization and trio whole-exome sequencing was carried out in the family.

Results: We identified a homozygous mutation affecting the GAF-B domain of the 3',5'-cyclic nucleotide phosphodiesterase PDE2A gene (c.1439A>G; p.Asp480Gly) as the candidate novel genetic cause of chorea in the proband. PDE2A hydrolyzes cyclic adenosine/guanosine monophosphate and is highly expressed in striatal medium spiny neurons. We functionally characterized the p.Asp480Gly mutation and found that it severely decreases the enzymatic activity of PDE2A. In addition, we showed equivalent expression in human and mouse striatum of PDE2A and its homolog gene, PDE10A.

Conclusions: We identified a loss-of-function homozygous mutation in PDE2A associated to early-onset chorea. Our findings possibly strengthen the role of cyclic adenosine monophosphate and cyclic guanosine monophosphate metabolism in striatal medium spiny neurons as a crucial pathophysiological mechanism in hyperkinetic movement disorders. © 2018 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

Keywords

PDE2A; chorea; movement disorders; phosphodiesterase; striatum.

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