title: Is phenotypic variation of hereditary progressive dystonia with marked diurnal fluctuation/dopa-responsive dystonia (HPD/DRD) caused by the difference of the locus of mutation on the GTP cyclohydrolase 1 (GCH-1) gene?
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D004252:DNA Mutational Analysis; D004421:Dystonia / Q000145:classification / Q000188:drug therapy / Q000209:etiology / Q000235:genetics*; D005091:Exons; D005192:Family Health; D005260:Female; D006136:GTP Cyclohydrolase / Q000235:genetics*; D006801:Humans; D007438:Introns; D007980:Levodopa / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010375:Pedigree; D010641:Phenotype
chemical_list: D007980:Levodopa; D006136:GTP Cyclohydrolase