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Related Concept Videos

Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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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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Retroviruses02:33

Retroviruses

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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’...
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Retrovirus Life Cycles01:10

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...
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Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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LTR Retrotransposons03:08

LTR Retrotransposons

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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
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Viral Recombination00:57

Viral Recombination

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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.
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Related Experiment Videos

HIV-1 Vpr-a still "enigmatic multitasker".

Carolin A Guenzel1, Cécile Hérate1, Serge Benichou1

  • 1Cochin Institute, INSERM U1016, Centre National de la Recherche Scientifique UMR8104, Université Paris-Descartes Paris, France.

Frontiers in Microbiology
|April 19, 2014
PubMed
Summary

The Vpr protein is crucial for human immunodeficiency virus type 1 (HIV-1) replication, aiding viral DNA import and replication. Its exact role in natural infection remains unclear, necessitating further research into HIV-1 Vpr functions.

Keywords:
HIV-1 Vprapoptosiscell cyclenuclear importreverse transcription

Related Experiment Videos

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • The Vpr protein is a conserved auxiliary protein found in human immunodeficiency virus type 1 (HIV-1), HIV-2, and simian immunodeficiency viruses (SIV).
  • Vpr and SIV Vpx are unique among viral proteins for their direct incorporation into virus particles via interaction with the Gag precursor.
  • This incorporation suggests a critical role for Vpr in the early stages of the viral life cycle within newly infected cells.

Purpose of the Study:

  • To review and summarize the known functions of HIV-1 Vpr.
  • To discuss the significance of these Vpr functions within the broader context of the viral life cycle.
  • To highlight the enigmatic aspects of Vpr's role during natural HIV-1 infection.

Main Methods:

  • Literature review of existing studies on HIV-1 Vpr.
  • Analysis of reported cellular targets and functions of Vpr.
  • Synthesis of information regarding Vpr's impact on viral replication and host cell interactions.

Main Results:

  • Vpr is implicated in diverse functions including cell cycle arrest, apoptosis, modulation of reverse transcription fidelity, and nuclear import of viral DNA.
  • Vpr influences viral and host cell gene transcription.
  • Despite identified cellular targets, the precise in vivo functions of Vpr during natural infection remain largely unknown.

Conclusions:

  • HIV-1 Vpr plays multifaceted roles essential for efficient viral replication, particularly in early infection stages.
  • Understanding Vpr's functions is critical for comprehending the complete HIV-1 life cycle.
  • Further investigation is required to fully elucidate the enigmatic role of Vpr in natural HIV-1 pathogenesis.