title: Participants at the Leiden Site of the REGISTRY Study: A Demographic Approach.
abstract: BACKGROUND
  REGISTRY is the largest European observational study of Huntington's disease (HD). The Leiden University Medical Center (LUMC) in The Netherlands is the largest recruiting site.
  
  
  OBJECTIVE
  The aim of this paper is to give an overview of the baseline characteristics of all Leiden participants from the start of the study in 2005 until the close of REGISTRY at the LUMC in September 2014.
  
  
  METHODS
  The Leiden cohort is described in two different ways: CAG repeat length and presence of motor signs.
  
  
  RESULTS
  Division into groups based on prolonged CAG length revealed that the cohort consists of 4 intermediate - (27-35 CAG), 22 reduced penetrance - (36-39 CAG), 465 full penetrance - (>39 CAG) and 60 control participants (<27 CAG). The second way of dividing the participants based on present or absent of motor signs, showed that 170 pre-motormanifest - and 317 motormanifest participants were enrolled.
  
  
  CONCLUSIONS
  The Leiden REGISTRY cohort at baseline is mainly characterized by full penetrance gene expansion carriers who have been clinically diagnosed with HD but who remain relatively functionally independent. For the majority of these participants, disease onset was based on motor signs followed by psychiatric and cognitive signs.
authors.affiliation: Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands.
authors.forename: Verena
authors.initials: V
authors.lastname: Baake
authors.affiliation: Center for Human Drug Research, Leiden, The Netherlands.
authors.forename: Ellen P
authors.initials: EP
authors.lastname: Hart
authors.affiliation: Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands.
authors.forename: Reineke
authors.initials: R
authors.lastname: Bos
authors.affiliation: Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands.
authors.forename: Raymund A C
authors.initials: RA
authors.lastname: Roos
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D006816:Huntington Disease; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D009483:Neuropsychological Tests; D012042:Registries; D019680:Trinucleotide Repeat Expansion; D055815:Young Adult
keywords: Huntington’s disease; Leiden; REGISTRY study; clinical characteristics; demographics