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Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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...
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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Updated: May 8, 2026

Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
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How does HIV-1 infect a susceptible human cell?: Current thinking.

Ali A Al-Jabri1

  • 1Department of Microbiology and Immunology, College of Medicine & Health Sciences, Sultan Qaboos University, P.O. Box 35, Al Khod-123, Muscat, Sultanate of Oman.

Journal for Scientific Research. Medical Sciences
|September 11, 2013
PubMed
Summary

Human Immunodeficiency Virus (HIV) uses multiple entry points to infect cells, complicating immune defense and treatment development. Understanding these complex HIV infection pathways is crucial for designing effective antiviral therapies.

Keywords:
AIDSHIVimmuneinfectionsusceptible cellvirus

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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture
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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture

Published on: October 12, 2018

Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • The human immunodeficiency virus (HIV) employs multiple cellular entry mechanisms, posing challenges for immune system control and scientific research.
  • Understanding HIV's complex infection process is vital for developing targeted antiviral strategies and comprehending disease pathogenesis.

Purpose of the Study:

  • To review current knowledge and challenges in understanding HIV-1 cell entry mechanisms.
  • To discuss the difficulties in HIV infectivity testing and the behavior of various HIV isolates in vitro.
  • To highlight the implications for designing novel HIV entry inhibitors.

Main Methods:

  • Review of existing literature on HIV-1 entry pathways.
  • In vitro analysis of different laboratory-adapted and clinical HIV isolates.
  • Assessment of peripheral blood mononuclear cell (PBMC) susceptibility to HIV infection.

Main Results:

  • HIV's multi-gate entry strategy complicates viral clearance and therapeutic intervention.
  • Variability in HIV isolate behavior in vitro presents challenges for standardized infectivity testing.
  • PBMC susceptibility to HIV infection in vitro varies, impacting research reproducibility.

Conclusions:

  • Elucidating HIV's diverse entry mechanisms is essential for developing effective treatments.
  • Addressing the challenges in HIV infectivity assays is critical for advancing drug discovery.
  • Further research into HIV-host cell interactions is needed to overcome viral resistance and pathogenesis.