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Updated: Dec 30, 2025
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
Published on: September 26, 2011
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Origin, diffusion and evolution of HIV-1 group O viruses
Marie Leoz1, Fabienne De Oliveira1, Jean-Christophe Plantier1
1Normandie Univ, UniRouen, EA2656, CHU de Rouen, Laboratoire associé au Centre national de référence du VIH, 76000 Rouen, France.
Virologie (Montrouge, France)
|January 23, 2020
Summary
Human immunodeficiency virus type 1 group O (HIV-1/O) are rare variants primarily in Cameroon. Understanding their limited spread and evolutionary potential is crucial for future epidemic control.
Area of Science:
- Virology
- Epidemiology
- Evolutionary Biology
Background:
- HIV-1 group O (HIV-1/O) are rare variants, primarily circulating in Cameroon, with an emergence timeline similar to HIV-1 group M.
- Despite their long history, the reasons for HIV-1/O's limited global diffusion remain unclear, though cases have been exported globally.
- Over a hundred HIV-1/O cases have been identified in France, predominantly linked to Cameroonian origins.
Purpose of the Study:
- To investigate the epidemiological, evolutionary, and virological factors contributing to the limited spread of HIV-1/O.
- To understand the genetic diversity and phylogenetic structure of HIV-1/O strains.
- To explore the implications of HIV-1/O's divergence from HIV-1/M on viral properties, such as tetherin antagonism.
Main Methods:
- Phylogenetic analysis to understand the evolutionary history and structure of HIV-1/O.
- Genetic diversity assessment of HIV-1/O strains.
- Comparative studies on viral properties, including interactions with host factors like tetherin.
Main Results:
- HIV-1/O exhibits significant genetic diversity and an atypical phylogenetic structure, with recent unification of nomenclature based on evolutionary history.
- The divergence of HIV-1/O from HIV-1/M may influence critical viral characteristics, including resistance to host defense mechanisms like tetherin.
- Emergence of diverse M/O intergroup recombinants indicates significant evolutionary potential within HIV-1 group O.
Conclusions:
- Further research into the epidemiology, evolution, and virology of HIV-1/O is essential for understanding its limited spread.
- The evolutionary potential of HIV-1/O, evidenced by intergroup recombinants, warrants continued monitoring and investigation.
- Elucidating the factors behind HIV-1/O's restricted diffusion is key to predicting the future trajectory of this HIV variant.
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