title: [Sequence analysis of gag and env genes of HIV type 1 circulating in former blood donors of Fuyang city, Anhui province].
abstract: OBJECTIVE
  To determine the subtype and analyze the genetic characteristics of the HIV-1 predominantly circulating in the former blood donors of Fuyang city, Anhui province.
  
  
  METHODS
  Whole blood samples were collected from 294 HIV-positive former blood donors of Fuyang city, 157 males and 137 females, aged 42 +/- 8. The fragments of HIV-1 env and gag genes were amplified by nested-PCR from the whole blood samples and thereafter sequenced. The env and gag sequences derived from 244 and 245 HIV infected individuals respectively were analyzed by using MEGA software, and related researches were also done according to the disease progression of the HIV infected individuals.
  
  
  RESULTS
  Phylogenetic trees showed that both the env and gag strains were clustered with the Thailand B reference strains. The internal nucleotide distances of the env and gag genes were 9.11% and 3.59% respectively. The nucleotide distances of both env and gag genes significantly increased as the CD4 T-cell counts decreased or as the viral load rose (both P < 0.001). The V3 loop tip motifs were dramatically dominated by GPGQ in the long-time non-progressors, and by GPGR in the slow progressors (P = 0.038).
  
  
  CONCLUSIONS
  The predominant strains circulating in the HIV-1 infected former blood donors of Fuyang city are of the Thailand B clade. Low CD4 T-cell count and high viral load are associated with the increase of genetic distances among viral isolates. The V3 loop tip motif changes from GPGQ to GPGR along with the progression of disease.
authors.affiliation: National Center for AIDS/STD Prevention and Control, Chinese Center for Disease Prevention and Control, Beijing 100050, China.
authors.forename: Shu-hua
authors.initials: SH
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Xing
authors.forename: Jian-jun
authors.initials: JJ
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Su
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Yu
authors.initials: Y
authors.lastname: Quan
authors.forename: Quan-bi
authors.initials: QB
authors.lastname: Zhao
authors.forename: Yu-hua
authors.initials: YH
authors.lastname: Ruan
authors.forename: Jian-qing
authors.initials: JQ
authors.lastname: Xu
authors.forename: Yan-hui
authors.initials: YH
authors.lastname: Song
authors.forename: Yi-ming
authors.initials: YM
authors.lastname: Shao
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000097:blood* / Q000453:epidemiology / Q000821:virology; D000328:Adult; D000368:Aged; D000595:Amino Acid Sequence; D001782:Blood Donors; D002681:China / Q000453:epidemiology; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics; D005260:Female; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D054299:env Gene Products, Human Immunodeficiency Virus / Q000145:classification / Q000235:genetics*; D054301:gag Gene Products, Human Immunodeficiency Virus / Q000235:genetics*