title: [Molecular epidemiology of the human immunodeficiency virus type 1 in Santiago, Chile].
abstract: BACKGROUND
  Most of the studies of HIV-1 infection in South America have been limited to Brazil and little is known about the viral variants that are causing disease elsewhere in the continent.
  
  
  OBJECTIVE
  To determine the characteristics of the viral variants present in Chile as well as patterns of viral transmission.
  
  
  METHODS
  Viral sequences were obtained from 21 HIV-1 infected people from Santiago, Chile who were infected either via sexual contact or intravenous drug use. Cloned sequences obtained from both the third variable and conserved regions of the envelope as well as the viral protease were evaluated.
  
  
  RESULTS
  We found only clade B subtype viruses in Santiago. An evaluation of the envelope gene revealed no evidence that the sequences were monophyletic by risk group. A number of the protease sequences were predicted to encode amino acid substitutions commonly found during selection for protease inhibitor resistance.
  
  
  CONCLUSIONS
  The HIV-1 strains studied in Chile, belong to the subtype B. There is no molecular evidence of separate introductions of the virus into the different risk groups. A number of substitutions in the protease gene that may confer resistance to protease inhibitors were found in patients with no previous exposure to this class of drugs.
authors.affiliation: Departamento de Medicina, Pontificia Universidad Católica de Chile. cape@med.puc.cl
authors.forename: C
authors.initials: C
authors.lastname: Pérez
authors.forename: P
authors.initials: P
authors.lastname: Vial
authors.forename: K S
authors.initials: KS
authors.lastname: Dorman
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Abarca
authors.forename: J S
authors.initials: JS
authors.lastname: Sinsheimer
authors.forename: A H
authors.initials: AH
authors.lastname: Kaplan
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology; D000328:Adult; D000595:Amino Acid Sequence; D001483:Base Sequence; D002677:Chile / Q000453:epidemiology; D004279:DNA, Viral / Q000235:genetics; D005260:Female; D016333:HIV Protease / Q000235:genetics*; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction
chemical_list: D004279:DNA, Viral; D016333:HIV Protease