title: Assessing the role of DRD5 and DYT1 in two different case-control series with primary blepharospasm.
abstract: Primary blepharospasm is a common adult-onset focal dystonia. Polymorphisms of the genes encoding TorsinA (DYT1) and the D5 dopamine receptor (DRD5) have previously been associated with lifetime risk for focal dystonia. We describe here experiments testing common variability within these two genes in two independent cohorts of Italian and North American patients with primary blepharospasm. We have failed to identify a consistent association with disease in the two patient groups examined here; however, analysis of the Italian group reveals an association with the same risk genotype in DYT1 as previously described in an Icelandic population. We have also found global significant DYT1 haplotype differences between patients and controls in the Italian series. These data suggest that further examination is warranted of the role genetic variability at this locus plays in the risk for primary dystonia.
authors.affiliation: Molecular Genetics Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, Maryland, USA. jclarimon@santpau.es
authors.forename: Jordi
authors.initials: J
authors.lastname: Clarimon
authors.forename: Francesco
authors.initials: F
authors.lastname: Brancati
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Peckham
authors.forename: Enza Maria
authors.initials: EM
authors.lastname: Valente
authors.forename: Bruno
authors.initials: B
authors.lastname: Dallapiccola
authors.forename: Giovanni
authors.initials: G
authors.lastname: Abruzzese
authors.forename: Paolo
authors.initials: P
authors.lastname: Girlanda
authors.forename: Giovanni
authors.initials: G
authors.lastname: Defazio
authors.forename: Alfredo
authors.initials: A
authors.lastname: Berardelli
authors.forename: Mark
authors.initials: M
authors.lastname: Hallett
authors.forename: Andrew B
authors.initials: AB
authors.lastname: Singleton
mesh_terms: D001764:Blepharospasm / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology*; D016022:Case-Control Studies; D017931:DNA Primers / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D015810:Linkage Disequilibrium / Q000235:genetics; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics; D008875:Middle Aged; D018832:Molecular Chaperones / Q000235:genetics / Q000502:physiology*; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics; D050641:Receptors, Dopamine D5 / Q000235:genetics / Q000502:physiology*; D012720:Severity of Illness Index
chemical_list: D017931:DNA Primers; C493605:DRD5 protein, human; D018832:Molecular Chaperones; C108175:TOR1A protein, human; D050641:Receptors, Dopamine D5