DYT6 dystonia: mutation screening, phenotype, and response to deep brain stimulation.
Mutations in THAP1, a gene encoding a nuclear pro-apoptotic protein, have been associated with DYT6 dystonia. First reports on the phenotype of DYT6 dystonia show an early onset dystonia with predominant cranio-cervical and laryngeal involvement. Here we assessed the frequency and phenotype of THAP1 mutation carriers in a large Dutch cohort of adult-onset (≥26 years) dystonia (n = 388) and early-onset dystonia (n = 67) patients. We describe the phenotype of DYT6 dystonia patients and their response on GPi DBS. Overall, 3 nonsynonymous heterozygous mutations were detected in the early-onset group (4.5%). Two DYT6 families were identified, showing a heterozygous phenotype. All patients had segmental or generalized dystonia, often associated with profound oromandibular and laryngeal involvement. No nonsynonymous mutations were found in patients with adult-onset focal dystonia. Rare synonymous variants were identified in conserved regions of THAP1, two in the adult-onset cervical dystonia group and one in the control group. Four DYT6 dystonia patients were treated with GPi DBS with moderate to good response on motor function but marginal benefit on speech.
Groen
Justus L
JL
Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Ritz
Katja
K
Contarino
Maria Fiorella
MF
van de Warrenburg
Bart P
BP
Aramideh
Majid
M
Foncke
Elisabeth M
EM
van Hilten
Jacobus J
JJ
Schuurman
P Richard
PR
Speelman
Johannes D
JD
Koelman
Johannes H
JH
de Bie
Rob M A
RM
Baas
Frank
F
Tijssen
Marina A
MA
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D051017:Apoptosis Regulatory Proteins / Q000235:genetics*; D015331:Cohort Studies; D004268:DNA-Binding Proteins / Q000235:genetics*; D046690:Deep Brain Stimulation / Q000379:methods*; D004422:Dystonia Musculorum Deformans / Q000235:genetics / Q000503:physiopathology / Q000628:therapy; D005192:Family Health; D005260:Female; D005820:Genetic Testing / Q000379:methods; D005838:Genotype; D005917:Globus Pallidus / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D009426:Netherlands / Q000453:epidemiology; D009687:Nuclear Proteins / Q000235:genetics*; D010641:Phenotype; D055815:Young Adult
D051017:Apoptosis Regulatory Proteins; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; C474080:THAP1 protein, human