title: Genetics of Parkinson disease and essential tremor.
abstract: OBJECTIVE
  Elucidating the genetic background of Parkinson disease and essential tremor is crucial to understand the pathogenesis and improve diagnostic and therapeutic strategies.
  
  
  RESULTS
  A number of approaches have been applied including familial and association studies, and studies of gene expression profiles to identify genes involved in susceptibility to Parkinson disease. These studies have nominated a number of candidate Parkinson disease genes and novel loci including Omi/HtrA2, GIGYF2, FGF20, PDXK, EIF4G1 and PARK16. A recent notable finding has been the confirmation for the role of heterozygous mutations in glucocerebrosidase (GBA) as risk factors for Parkinson disease. Finally, association studies have nominated genetic variation in the leucine-rich repeat and Ig containing 1 gene (LINGO1) as a risk for both Parkinson disease and essential tremor, providing the first genetic evidence of a link between the two conditions.
  
  
  CONCLUSIONS
  Although undoubtedly genes remain to be identified, considerable progress has been achieved in the understanding of the genetic basis of Parkinson disease. This same effort is now required for essential tremor. The use of next-generation high-throughput sequencing and genotyping technologies will help pave the way for future insight leading to advances in diagnosis, prevention and cure.
authors.affiliation: Division of Neurology, Department of Clinical Neuroscience, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland. christian.wider@chuv.ch
authors.forename: Christian
authors.initials: C
authors.lastname: Wider
authors.forename: Owen A
authors.initials: OA
authors.lastname: Ross
authors.forename: Zbigniew K
authors.initials: ZK
authors.lastname: Wszolek
mesh_terms: D002874:Chromosome Mapping / Q000379:methods* / Q000639:trends; D004252:DNA Mutational Analysis / Q000379:methods / Q000639:trends; D020329:Essential Tremor / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology; D020869:Gene Expression Profiling / Q000379:methods / Q000639:trends; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D010300:Parkinson Disease / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology