A Gain-of-Function Variant in Dopamine D2 Receptor and Progressive Chorea and Dystonia Phenotype

Marlous C.M. van der Weijden, Dayana Rodriguez-Contreras, Cathérine C.S. Delnooz, Brooks G. Robinson, Alec F. Condon, Michelle L. Kielhold, Gilles N. Stormezand, Kai Yu Ma, Claudia Dufke, John T. Williams, Kim A. Neve, Marina A.J. Tijssen, Dineke S. Verbeek

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Background: We describe a 4-generation Dutch pedigree with a unique dominantly inherited clinical phenotype of a combined progressive chorea and cervical dystonia carrying a novel heterozygous dopamine D2 receptor (DRD2) variant. Objectives: The objective of this study was to identify the genetic cause of the disease and to further investigate the functional consequences of the genetic variant. Methods: After detailed clinical and neurological examination, whole-exome sequencing was performed. Because a novel variant in the DRD2 gene was found as the likely causative gene defect in our pedigree, we sequenced the DRD2 gene in a cohort of 121 Huntington-like cases with unknown genetic cause (Germany). Moreover, functional characterization of the DRD2 variant included arrestin recruitment, G protein activation, and G protein-mediated inhibition of adenylyl cyclase determined in a cell model, and G protein-regulated inward-rectifying potassium channels measured in midbrain slices of mice. Result: We identified a novel heterozygous variant c.634A > T, p.Ile212Phe in exon 5 of DRD2 that cosegregated with the clinical phenotype. Screening of the German cohort did not reveal additional putative disease-causing variants. We demonstrated that the D2S/L-I212F receptor exhibited increased agonist potency and constitutive activation of G proteins in human embryonic kidney 239 cells as well as significantly reduced arrestin3 recruitment. We further showed that the D2S-I212F receptor exhibited aberrant receptor function in mouse midbrain slices. Conclusions: Our results support an association between the novel p.Ile212Phe variant in DRD2, its modified D2 receptor activity, and the hyperkinetic movement disorder reported in the 4-generation pedigree.

Original languageEnglish (US)
Pages (from-to)729-739
Number of pages11
JournalMovement Disorders
Volume36
Issue number3
DOIs
StatePublished - Mar 2021

Keywords

  • chorea
  • dopamine D2 receptor
  • dystonia
  • hyperkinetic movement disorder

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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