Lentivirus

A genus of retroviruses that cause chronic and progressive diseases

Lentivirus is a genus of retroviruses that cause chronic and progressive diseases characterized by long incubation periods. The name "lentivirus" is derived from the Latin word "lenti," meaning "slow," which reflects the slow progression of the diseases they cause. Lentiviruses are part of the Retroviridae family and are known for their ability to integrate into the host genome, leading to persistent infections.

Structure

File:HI-virion-structure en.svg

Diagram of a lentivirus structure

Lentiviruses are enveloped viruses with a complex structure. They possess a lipid bilayer envelope derived from the host cell membrane, which contains viral glycoproteins essential for entry into host cells. Inside the envelope is a capsid that encases the viral RNA genome and associated proteins. The genome of lentiviruses is composed of two identical single-stranded RNA molecules, which are reverse transcribed into DNA upon infection of a host cell.

Genome and Replication

Lentiviruses have a complex genome organization that includes the typical retroviral genes: gag, pol, and env, as well as additional regulatory genes such as tat, rev, and others that are involved in the regulation of viral replication and pathogenesis. The replication cycle of lentiviruses involves reverse transcription of the RNA genome into DNA, integration of the viral DNA into the host genome, and subsequent transcription and translation of viral proteins.

Pathogenesis

Lentiviruses are known for causing chronic diseases with long incubation periods. They can infect a variety of cell types, including macrophages and T cells, leading to immune system dysfunction. The most well-known lentivirus is the Human Immunodeficiency Virus (HIV), which causes Acquired Immunodeficiency Syndrome (AIDS). Other lentiviruses infect animals, such as the Feline Immunodeficiency Virus (FIV) in cats and the Simian Immunodeficiency Virus (SIV) in primates.

Applications in Research

File:ShRNA Lentivirus.svg

Diagram of shRNA lentivirus used in research

Lentiviruses are widely used in research and biotechnology due to their ability to stably integrate into the host genome. They are commonly used as vectors for gene therapy and RNA interference (RNAi) applications. Lentiviral vectors can deliver therapeutic genes or short hairpin RNA (shRNA) into target cells, providing a powerful tool for studying gene function and developing treatments for genetic diseases.

Related pages

• Retrovirus
• Human Immunodeficiency Virus
• Gene therapy
• RNA interference