Biologically diverse molecular variants within a single HIV-1 isolate

Area of Science:

• Virology
• Immunology
• Genetics

Background:

• Acquired immunodeficiency syndrome (AIDS) involves progressive immune decline caused by human immunodeficiency viruses (HIV-1, HIV-2).
• Mechanisms of HIV-1 persistence and the impact of its genetic variation within individuals remain poorly understood.
• Lentiviruses, including HIV-1, cause disease in humans and animals, but disease mechanisms are not fully elucidated.

Purpose of the Study:

• To investigate the biological properties and significance of genetic variation in HIV-1 within a single infected individual.
• To determine how specific viral components, such as the envelope region, contribute to HIV-1's biological diversity and growth capacity.

Main Methods:

• Generation of a series of proviral clones of HIV-1 derived from a single patient.
• Construction of hybrid HIV-1 genomes by substituting the envelope region from different clones into a prototype genome.
• Comparison of the growth capacity of generated viruses in human T cells, cell lines, and monocytoid cultures.

Main Results:

• Hybrid HIV-1 genomes generated viruses with markedly different growth capacities.
• Biological variation was observed across human T cells, cell lines, and monocytoid cultures.
• The viral envelope region was identified as a significant determinant of this observed biological variation.

Conclusions:

• Extensive biological variation exists within HIV-1 populations in vivo during a single individual's infection.
• The viral envelope is a critical determinant of HIV-1's biological diversity and pathogenic potential.
• Understanding this variation is crucial for addressing HIV-1 persistence and disease progression.