TY - JOUR
T1 - Phenotypes and genetic architecture of focal primary torsion dystonia
AU - Groen, Justus L.
AU - Kallen, Marlot C.
AU - Van De Warrenburg, Bart P.C.
AU - Speelman, J. D.
AU - Van Hilten, Jacobus J.
AU - Aramideh, Majid
AU - Boon, Agnita J.W.
AU - Klein, Christine
AU - Koelman, Johannes H.T.M.
AU - Langeveld, Ton P.
AU - Baas, Frank
AU - De Koning-Tijssen, Marina A.J.
PY - 2012/10/1
Y1 - 2012/10/1
N2 - Background: The focal primary torsion dystonias (FPTDs) form a group of clinical heterogeneous syndromes and can be considered a genetic complex disease; it is thought to be primed by genetic variants with variable impact and triggered by non-genetic factors. Thorough clinical description of FPTDs cohorts is sparse but essential for further progress in genetic research. Objective: To establish suggested relations between age at onset (AaO), site and family history in a large focal dystonias cohort and gain more insight into familial clustering for genetic research. Patients and methods: A prospective cohort study between March 2008 and March 2011, including 676 FPTD patients attending the botulinum toxin outpatient clinics of six Dutch movement disorder centres. Results and conclusions: Of all of the FPTD patients, 25% had a familial predisposition; in 2.4% a Mendelian inheritance pattern was noted. With a stronger family history, a significantly lower AaO was seen in all focal dystonias. In both the sporadic and familial focal dystonia groups, AaO had an effect on the distribution of dystonia, with a caudal to cranial tendency. In all focal dystonia forms, women were more frequently affected, except for writer's cramp. Careful clinical characterisation will allow the formation of phenotype subgroups. We suggest that genetic research into FPTDs will benefit from this approach and discuss genetic research strategies to decipher the complex background of focal dystonias.
AB - Background: The focal primary torsion dystonias (FPTDs) form a group of clinical heterogeneous syndromes and can be considered a genetic complex disease; it is thought to be primed by genetic variants with variable impact and triggered by non-genetic factors. Thorough clinical description of FPTDs cohorts is sparse but essential for further progress in genetic research. Objective: To establish suggested relations between age at onset (AaO), site and family history in a large focal dystonias cohort and gain more insight into familial clustering for genetic research. Patients and methods: A prospective cohort study between March 2008 and March 2011, including 676 FPTD patients attending the botulinum toxin outpatient clinics of six Dutch movement disorder centres. Results and conclusions: Of all of the FPTD patients, 25% had a familial predisposition; in 2.4% a Mendelian inheritance pattern was noted. With a stronger family history, a significantly lower AaO was seen in all focal dystonias. In both the sporadic and familial focal dystonia groups, AaO had an effect on the distribution of dystonia, with a caudal to cranial tendency. In all focal dystonia forms, women were more frequently affected, except for writer's cramp. Careful clinical characterisation will allow the formation of phenotype subgroups. We suggest that genetic research into FPTDs will benefit from this approach and discuss genetic research strategies to decipher the complex background of focal dystonias.
UR - http://www.scopus.com/inward/record.url?scp=84866171527&partnerID=8YFLogxK
U2 - 10.1136/jnnp-2012-302729
DO - 10.1136/jnnp-2012-302729
M3 - Journal articles
C2 - 22773857
AN - SCOPUS:84866171527
SN - 0022-3050
VL - 83
SP - 1006
EP - 1011
JO - Journal of Neurology, Neurosurgery and Psychiatry
JF - Journal of Neurology, Neurosurgery and Psychiatry
IS - 10
ER -
