title: TAP polymorphism in patients with Behçet's disease.
abstract: OBJECTIVE
  To determine if susceptibility to Behçet's disease (BD) is associated with polymorphism of HLA-DRB1, HLA-DQB1, DQB1, and TAP1 and TAP2 genes.
  
  
  METHODS
  Fifty eight Spanish BD patients and 116 ethnically matched unrelated healthy subjects were typed at the HLA-DRB1 and HLA-DQB1 loci using polymerase chain reaction/sequence specific oligotyping (PCR/SSO). TAP1 and TAP2 alleles were assigned using amplification refractory mutation system-PCR.
  
  
  RESULTS
  TAP1C was absent in BD patients, but was found in 12.1% of control subjects (pcorr < 0.05; relative risk = 0.06). Additionally, a linkage disequilibrium between HLA-DQB1*0501 and TAP2B was observed in BD patients (delta = 0.095, pcorr < 0.02), but not in the control group (delta = -0.0031, p > 0.05).
  
  
  CONCLUSIONS
  The complete absence of TAP1C alleles in BD patients may indicate that TAP1 polymorphism is not without some significance in the development of BD. Furthermore, the existence of a linkage disequilibrium between HLA-DQB1*0501 and TAP2B in our patients suggests that the gene conferring susceptibility for BD is inherited as an extended haplotype in the population studied.
authors.affiliation: Servicio de Inmunología, Hospital Universitario Virgen del Rocío, Sevilla, Spain.
authors.forename: M F
authors.initials: MF
authors.lastname: González-Escribano
authors.forename: J
authors.initials: J
authors.lastname: Morales
authors.forename: J R
authors.initials: JR
authors.lastname: García-Lozano
authors.forename: M J
authors.initials: MJ
authors.lastname: Castillo
authors.forename: J
authors.initials: J
authors.lastname: Sánchez-Román
authors.forename: A
authors.initials: A
authors.lastname: Núñez-Roldán
authors.forename: B
authors.initials: B
authors.lastname: Sánchez
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000328:Adult; D000483:Alleles; D001528:Behcet Syndrome / Q000235:genetics / Q000276:immunology*; D004198:Disease Susceptibility; D006683:HLA-DQ Antigens / Q000235:genetics; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens / Q000235:genetics; D059811:HLA-DRB1 Chains; D006650:Histocompatibility Testing; D006801:Humans; D015810:Linkage Disequilibrium; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; C073119:TAP1 protein, human; C071692:TAP2 protein, human