title: New variants of E6 and E7 oncogenes of human papillomavirus type 31 identified in Northeastern Brazil.
abstract: OBJECTIVE
  We sought to characterize E6 and E7 oncogenes genetic variability of HPV-31 isolated from cervical scraping samples of Northeastern Brazilian women.
  
  
  METHODS
  E6 and E7 were amplified with specific primers, cloned and sequenced. The sequences obtained were aligned with the GenBank reference sequences with the aim of evaluating the possible genetic variants.
  
  
  RESULTS
  We identified several genetic variants in E6 and E7 sequences from HPV-31 positive women. Three nucleotide changes in E6 were described for the first time in this study. Some nucleotide changes were non-synonymous substitutions.
  
  
  CONCLUSIONS
  The knowledge of region/country HPV specific genetic variations is relevant to understand the epidemiology and the development of effective vaccines.
authors.affiliation: Department of Genetics, Federal University of Pernambuco, Recife, PE, Brazil.
authors.forename: Bárbara S
authors.initials: BS
authors.lastname: Chagas
authors.forename: Marcus V A
authors.initials: MV
authors.lastname: Batista
authors.forename: Vilma
authors.initials: V
authors.lastname: Guimarães
authors.forename: Valdir Q
authors.initials: VQ
authors.lastname: Balbino
authors.forename: Sergio
authors.initials: S
authors.lastname: Crovella
authors.forename: Antonio C
authors.initials: AC
authors.lastname: Freitas
mesh_terms: D000328:Adult; D000368:Aged; D018985:Epitopes, B-Lymphocyte; D018984:Epitopes, T-Lymphocyte; D005260:Female; D014644:Genetic Variation; D058952:Human papillomavirus 31 / Q000235:genetics*; D006801:Humans; D008875:Middle Aged; D009856:Oncogene Proteins, Viral / Q000235:genetics* / Q000276:immunology; D010802:Phylogeny; D002583:Uterine Cervical Neoplasms / Q000821:virology*
chemical_list: D018985:Epitopes, B-Lymphocyte; D018984:Epitopes, T-Lymphocyte; D009856:Oncogene Proteins, Viral