title: A complex human immunodeficiency virus type 1 A/G/J recombinant virus isolated from a seronegative patient with AIDS from Benin, West Africa.
abstract: A human immunodeficiency virus type 1 (HIV-1(B76)) originating from Benin (West Africa) was isolated and characterized. The patient had severe clinical AIDS and presented an unusual serological profile. Only one out of five different detection assays was able to demonstrate the presence of antibodies to HIV, whereas confirmatory assays remained indeterminate. In contrast, both plasma viral load and p24 antigen level were unusually high. HIV-1 infection was proved by viral RNA and proviral DNA amplification. HIV-1(B76) partially purified lysate reacted strongly with all anti-HIV-1-positive sera from the region but B76 plasma did not react with subtype A control viral antigen. This patient is likely to have had severe acquired immune dysfunction explaining her lack of immunological reactivity. Phylogenetic analysis of the genome identified a complex HIV-1 A/G/J recombinant. The gag and pol genes, and the majority of nef,are characteristic of subtype A; the gag/pol junction, the 3' end of pol, vpu and env genes were characteristic of subtype G; vif, vpr and the 5' end of nef were subtype J. In addition, part of the HIV-1(B76) genome had considerable sequence similarity with the previously described CRF06 cpx (BFP90) isolate. HIV-1(B76) did not exhibit any remarkable replication properties or cell tropism in vitro.
authors: Department of Haematology, University of Cambridge, East Anglia Blood Centre, Long Road, Cambridge CB2 2PT, UK1.
authors: E
authors: E
authors: Baldrich-Rubio
authors: Department of Microbiology, Centre National Hôpitalier Universitaire and Programme National de Lutte contre le SIDA, Cotonou, Benin2.
authors: S
authors: S
authors: Anagonou
authors: Department of Haematology, University of Cambridge, East Anglia Blood Centre, Long Road, Cambridge CB2 2PT, UK1.
authors: K
authors: K
authors: Stirrups
authors: Department of Microbiology, Centre National Hôpitalier Universitaire and Programme National de Lutte contre le SIDA, Cotonou, Benin2.
authors: E
authors: E
authors: Lafia
authors: National Blood Service, Cambridge, UK3.
authors: D
authors: D
authors: Candotti
authors: Department of Haematology, University of Cambridge, East Anglia Blood Centre, Long Road, Cambridge CB2 2PT, UK1.
authors: H
authors: H
authors: Lee
authors: Division of Transfusion Medicine, Department of Haematology, University of Cambridge, UK4.
authors: J P
authors: JP
authors: Allain
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000097:blood / Q000276:immunology / Q000821:virology*; D000328:Adult; D001483:Base Sequence; D001541:Benin; D001665:Binding Sites; D004279:DNA, Viral; D005260:Female; D015483:HIV Antibodies / Q000276:immunology; D054303:HIV Reverse Transcriptase / Q000378:metabolism; D018023:HIV Seronegativity / Q000276:immunology; D015497:HIV-1 / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012367:RNA, Viral / Q000097:blood; D011995:Recombination, Genetic; D017423:Sequence Analysis, RNA; D014764:Viral Proteins / Q000276:immunology; D014779:Virus Replication
chemical_list: D004279:DNA, Viral; D015483:HIV Antibodies; D012367:RNA, Viral; D014764:Viral Proteins; D054303:HIV Reverse Transcriptase