title: A genome-wide scan and HCRTR2 candidate gene analysis in a European cluster headache cohort.
abstract: OBJECTIVE
  To investigate the molecular genetic basis of cluster headache (CH), using a genome-wide scan and candidate gene strategy.
  
  
  METHODS
  Northern European CH families and a case-control cohort of Danish, Swedish, and British origin (total n = 259 sporadic CH patients), including 267 control subjects matched for ancestry, participated in the study. A genome-wide genetic screen using approximately 400 microsatellite markers was performed for five informative Danish CH families. Additional markers were typed for those loci generating statistical evidence suggestive of linkage, together with genotypes for 111 individuals from further Danish and Italian kindreds. Sporadic CH patients and controls were investigated by association analysis for variation in the candidate gene, HCRTR2. Finally, complete HCRTR2 sequencing was undertaken for eight independent probands.
  
  
  RESULTS
  Potential linkage was identified at four possible disease loci in Danish kindreds, yet no single chromosome location generated a lod or NPL score of recognized significance. No deleterious sequence variants of the HCRTR2 gene were detected by comparison to wild-type sequence. Association of the HCRTR2 gene was not replicated in this large dataset, even when the data were stratified into distinct populations.
  
  
  CONCLUSIONS
  Cluster headache is a complex genetic disorder, with possible phenotypic and genetic heterogeneity compounding attempts at gene identification.
authors.affiliation: Division of Medical Genetics, University of Leicester, UK.
authors.forename: L
authors.initials: L
authors.lastname: Baumber
authors.forename: C
authors.initials: C
authors.lastname: Sjöstrand
authors.forename: M
authors.initials: M
authors.lastname: Leone
authors.forename: H
authors.initials: H
authors.lastname: Harty
authors.forename: G
authors.initials: G
authors.lastname: Bussone
authors.forename: J
authors.initials: J
authors.lastname: Hillert
authors.forename: R C
authors.initials: RC
authors.lastname: Trembath
authors.forename: M B
authors.initials: MB
authors.lastname: Russell
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002874:Chromosome Mapping; D003027:Cluster Headache / Q000453:epidemiology* / Q000235:genetics*; D015331:Cohort Studies; D004252:DNA Mutational Analysis; D005060:Europe / Q000453:epidemiology; D005260:Female; D020022:Genetic Predisposition to Disease / Q000453:epidemiology / Q000235:genetics; D005820:Genetic Testing / Q000379:methods*; D014644:Genetic Variation / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D064446:Orexin Receptors; D015995:Prevalence; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide / Q000235:genetics*; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors
chemical_list: D064446:Orexin Receptors; D043562:Receptors, G-Protein-Coupled; D018013:Receptors, Neuropeptide