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Retrovirus Life Cycles

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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...

Retroviruses

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Updated: May 25, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Published on: April 9, 2014

Antiretroviral restriction factors.

Theodora Hatziioannou¹, Paul D Bieniasz

¹Aaron Diamond AIDS Research Center, The Rockefeller University, New York, NY 10016, United States.

Current Opinion in Virology

|January 27, 2012

Summary

Retroviruses are inhibited by antiviral proteins called restriction factors. Viruses evolve to overcome these defenses, creating an ongoing evolutionary arms race with therapeutic potential.

Area of Science:

Virology
Immunology
Molecular Biology

Background:

Retroviruses have spurred the discovery of numerous antiviral proteins, known as restriction factors.
These factors possess diverse mechanisms, with some targeting retroviruses specifically and others exhibiting broader antiviral effects.

Purpose of the Study:

To review the mechanisms of action for key antiviral restriction factors.
To discuss viral counter-strategies, including the role of accessory proteins in evading host defenses.
To explore the co-evolutionary dynamics between restriction factors and viruses.

Main Methods:

Literature review of studies on retroviral restriction factors.
Analysis of viral accessory protein functions in antagonizing host immunity.

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Last Updated: May 25, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

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Identification of Nucleolar Factors During HIV-1 Replication Through Rev Immunoprecipitation and Mass Spectrometry

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Published on: June 26, 2019

A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses

A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses

Published on: August 31, 2014

Examination of evolutionary pressures shaping host-pathogen interactions.

Main Results:

Restriction factors employ various strategies to inhibit retroviral replication.
Retroviruses have evolved sophisticated mechanisms, including accessory proteins, to counteract restriction factors.
Co-evolution has led to specialized interactions and barriers to cross-species transmission.

Conclusions:

The interplay between restriction factors and viral antagonists drives viral evolution.
Understanding these intrinsic antiviral systems offers potential avenues for therapeutic intervention against retroviral infections.