Characterization of Rev function using subgenomic and genomic constructs in T and COS cells

Area of Science:

• * Molecular biology
• * Virology
• * Cell biology

Background:

• * The human immunodeficiency virus type 1 (HIV-1) relies on specific viral proteins for replication.
• * The HIV-1 Rev protein is crucial for regulating viral RNA processing and transport.
• * Understanding Rev's function is key to developing antiviral strategies.

Purpose of the Study:

• * To investigate the impact of the HIV-1 Rev protein on viral RNA splicing.
• * To determine Rev's effect on the accumulation of HIV-1 RNAs in the cytoplasm.
• * To explore how cell type and RNA construct complexity influence Rev's function.

Main Methods:

• * Experiments conducted in COS and T cells.
• * Utilized subgenomic and genomic constructs expressing varying HIV-1 RNA constituents.
• * Analyzed RNA splicing patterns and cytoplasmic accumulation levels in the presence and absence of Rev.

Main Results:

• * Demonstrated Rev's inhibitory effect on the level of fully spliced HIV-1 RNAs across all constructs and cell types.
• * Observed an increase in nuclear unspliced pre-mRNA with genomic constructs in the presence of Rev.
• * Showed Rev enhances cytoplasmic accumulation of HIV-1 RNAs, though some Rev-dependent RNAs accumulated in T cells without Rev.

Conclusions:

• * The HIV-1 Rev protein inhibits viral RNA splicing and enhances cytoplasmic RNA accumulation.
• * Rev's inhibitory effect on splicing is not solely due to pre-mRNA nuclear export enhancement.
• * Cell type, construct design, and RNA species significantly impact the manifestation of Rev protein function.