Assessing genetic-based therapies for AIDS using the simian immunodeficiency virus

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Simian immunodeficiency virus (SIV) is a lentivirus that infects non-human primates.
• SIVmac239 is a specific strain of SIV that serves as a model for human immunodeficiency virus (HIV).
• Viral replication and pathogenesis are complex processes involving multiple viral proteins.

Purpose of the Study:

• To generate a full-length infectious molecular proviral clone of SIVmac239.
• To assess the replication capacity and cytopathic effects of the generated SIVmac239.
• To investigate the role of the viral rev protein in SIV replication using a trans-dominant negative mutant.

Main Methods:

• Construction of a plasmid encoding the full-length infectious molecular proviral clone of SIVmac239.
• Transfection of cells with the proviral clone to generate infectious virus.
• In vitro replication studies in transformed human CD4+ cell lines and primary rhesus macaque peripheral blood mononuclear cells.
• Transient co-transfection assays with the SIV clone and a trans-dominant negative HIV-1 rev mutant.

Main Results:

• The generated SIVmac239 clone produced infectious virus that replicated to high levels in vitro.
• The virus exhibited cytopathic effects in some human CD4+ cell lines and primary rhesus macaque cells.
• The functional expression of the viral rev protein was confirmed as essential for SIV replication.

Conclusions:

• A functional infectious molecular proviral clone of SIVmac239 was successfully generated.
• This clone provides a valuable tool for studying SIV replication, pathogenesis, and for developing antiviral strategies.
• The essential role of the SIV rev protein in viral replication was further substantiated.