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Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Viral Structure00:56

Viral Structure

Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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...
Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
Introduction to Virus01:28

Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...

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Clade-specific differences in active viral replication and compartmentalization.

Monica Sala1, Mireille Centlivre, Simon Wain-Hobson

  • 1Unité de Rétrovirologie Moléculaire, Department of Virology, Institut Pasteur, 75015 Paris, France. joo@pasteur.fr

Current Opinion in HIV and AIDS
|April 18, 2009
PubMed
Summary
This summary is machine-generated.

HIV-1 clade-specific genetic variations influence viral replication and compartmentalization. Interleukin-7 may promote replication of certain HIV-1 clades, particularly in gut tissues, impacting disease progression.

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Area of Science:

  • Virology
  • Immunology
  • Genetics

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) exhibits significant genetic diversity across different clades.
  • Viral polymorphisms, particularly in the long terminal repeat (LTR) and Tat protein, are key determinants of viral behavior.
  • The gut-associated lymphoid tissue (GALT) is a critical site for HIV-1 pathogenesis.

Purpose of the Study:

  • To review the impact of HIV-1 clade-specific genetic variations on viral replication dynamics.
  • To examine the role of viral polymorphisms in HIV-1 compartmentalization in vivo.
  • To understand the influence of cytokine signaling, such as interleukin-7 (IL-7), on HIV-1 replication.

Main Methods:

  • Review of existing literature on HIV-1 clade-specific polymorphisms.
  • Analysis of studies investigating viral transcription, replication, and compartmentalization.
  • Examination of the role of cellular activation and cytokine signaling in HIV-1 pathogenesis.

Main Results:

  • HIV-1 transcription and compartmentalization are modulated by cellular activation and viral polymorphisms in LTR and Tat.
  • The GALT plays a central role in HIV-1 pathogenesis, supporting viral replication during primary infection.
  • Interleukin-7 preferentially activates HIV-1 clade C promoter over clades B and E, potentially influencing viral quasispeciation.

Conclusions:

  • Clade-specific LTR polymorphisms affect HIV-1 replication, and GALT depletion during primary infection may be clade-dependent, impacting disease progression.
  • Therapeutic IL-7 treatment could potentially enhance the replication of HIV-1 clades C and A, warranting further investigation.
  • Understanding clade-specific dynamics is crucial for managing HIV-1 infection and developing targeted therapies.