title: HLA alleles in Brazilian patients with fissured tongue.
abstract: BACKGROUND
  Fissured tongue (FT) is a clinical condition manifested by numerous little furrows on the tongue's surface. Previously, the authors observed an association with HLA-C×06 in psoriasis (PS) and benign migratory glossitis (BMG); however, HLA-C was not surveyed in FT.
  
  
  OBJECTIVE
  This study investigated the association between HLA alleles and FT.
  
  
  METHODS
  Thirty-three FT bearers were studied, after evaluation of criteria for inclusion. These patients did not present PS, BMG or any other conditions associated with FT. The control group (CG) was composed of 561 individuals with HLA-A, 560 individuals with HLA-B, 168 individuals with HLA-C, 564 individuals with HLA-DRB1 and 390 individuals with HLA-DQB1. Samples from these individuals were processed to extract DNA. The HLA classes I and II were determined using the reverse line blot technique. The frequencies of HLA antigens found in patients were compared with the CG using Fisher's exact test.
  
  
  RESULTS
  The comparison of the frequencies of HLA antigens found in the patient groups and in CG revealed no association with any of the alleles studied, except for HLA-A*01, which exhibited a decreased frequency in patient groups. HLA-C*06 was detected in 7.57% of FT patients and 10.42% of the CG (not significant).
  
  
  CONCLUSIONS
  The lack of association of FT with HLA-C*06 reinforces the proposal that this disease does not have a common genetic factor in the triad of BMG, FT and PS.
authors.affiliation: Discipline of Dermatology, Medical School, UNIMAR, Marília, SP, Brazil. herongonzaga@yahoo.com.br
authors.forename: H F S
authors.initials: HF
authors.lastname: Gonzaga
authors.forename: E V C
authors.initials: EV
authors.lastname: Marcos
authors.forename: F C S
authors.initials: FC
authors.lastname: Santana
authors.forename: M A
authors.initials: MA
authors.lastname: Jorge
authors.forename: J
authors.initials: J
authors.lastname: Tomimori
mesh_terms: D000483:Alleles; D001938:Brazil; D016022:Case-Control Studies; D006680:HLA Antigens / Q000235:genetics*; D006801:Humans; D014063:Tongue, Fissured / Q000235:genetics* / Q000276:immunology
chemical_list: D006680:HLA Antigens