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Envelope sequence variability and serologic characterization of HIV type 1 group O isolates from equatorial guinea
J C Hunt1, A M Golden, J K Lund
1AIDS Research and Retrovirus Discovery, Abbott Laboratories, North Chicago, Illinois 60064, USA.
AIDS Research and Human Retroviruses
|August 10, 1997
Summary
Four human immunodeficiency virus type 1 (HIV-1) group O-related viruses were identified in Equatorial Guinea. Genetic analysis confirmed these viruses are distinct from group M and HIV-2, with unique envelope gene sequences and immunodominant regions.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Human immunodeficiency virus type 1 (HIV-1) exists in distinct genetic groups, with Group M being the most prevalent worldwide.
- Group O strains of HIV-1 are rare and primarily found in West and Central Africa.
- Identifying novel viral strains is crucial for understanding HIV-1 evolution and developing effective diagnostics and therapeutics.
Purpose of the Study:
- To characterize novel HIV-1 group O-related viruses identified in Equatorial Guinea.
- To determine the genetic relatedness of these viruses to known HIV-1 groups and subtypes.
- To investigate the immunogenic properties of specific viral proteins.
Main Methods:
- Serological analysis of four serum samples from Equatorial Guinea using commercial assays and Western blot.
- Polymerase chain reaction (PCR) amplification of envelope (env) gene sequences using degenerate primers.
- Phylogenetic analysis of translated amino acid sequences using the PHYLIP package.
- Synthesis and serological testing of peptides corresponding to immunodominant regions (IDR) of gp41.
Main Results:
- Four HIV-1 group O-related viruses were identified in Equatorial Guinea based on differential serologic reactivity.
- Phylogenetic analysis of env gene sequences showed closer clustering with HIV-1 group O than group M.
- Unique amino acid sequences were identified in the V3 loop and gp41 immunodominant regions compared to known group O isolates.
- Antibodies in the sera showed highest reactivity against peptides derived from the identified EG isolates' IDRs.
Conclusions:
- The identified viruses represent novel HIV-1 group O-related strains distinct from previously reported group O and other HIV-1 groups.
- The unique genetic and immunogenic characteristics of these viruses highlight the genetic diversity of HIV-1 in Africa.
- Further surveillance and characterization of such strains are essential for comprehensive HIV-1 epidemiology and control efforts.