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Related Concept Videos

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...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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...
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.
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’...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...

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Related Experiment Video

Updated: Jun 2, 2026

Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells
10:22

Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells

Published on: November 12, 2015

Nuclear remodelling during viral infections.

H Zakaryan1, T Stamminger

  • 1Laboratory of Cell Biology, Institute of Molecular Biology of NAS, Yerevan, Armenia. hovakim@yba.am

Cellular Microbiology
|April 20, 2011
PubMed
Summary

Viruses hijack the host cell nucleus for replication due to limited coding capacity. Viral infections cause significant nuclear remodelling and interfere with antiviral defense mechanisms within the nucleus.

Area of Science:

  • Cell Biology
  • Virology
  • Molecular Biology

Background:

  • Viruses possess limited coding capacity and rely on host cell machinery for replication.
  • The host cell nucleus is a critical site exploited by both DNA and RNA viruses.
  • Viral infection leads to substantial alterations in nuclear structure and function.

Purpose of the Study:

  • To review the significant changes occurring within the host cell nucleus during viral infections.
  • To highlight the interplay between viruses and nuclear structures, including antiviral defense mechanisms.

Main Methods:

  • Literature review of studies on viral-nuclear interactions.
  • Analysis of documented nuclear remodelling events during viral pathogenesis.
  • Examination of viral strategies to overcome nuclear-based antiviral defenses.

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Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

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Identification of Nucleolar Factors During HIV-1 Replication Through Rev Immunoprecipitation and Mass Spectrometry
09:38

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

Published on: June 26, 2019

Related Experiment Videos

Last Updated: Jun 2, 2026

Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells
10:22

Isolation of Viral Replication Compartment-enriched Sub-nuclear Fractions from Adenovirus-infected Normal Human Cells

Published on: November 12, 2015

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy
09:03

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

Published on: January 18, 2018

Identification of Nucleolar Factors During HIV-1 Replication Through Rev Immunoprecipitation and Mass Spectrometry
09:38

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

Published on: June 26, 2019

Main Results:

  • Viruses extensively remodel the nucleus to facilitate viral replication.
  • Subnuclear structures like promyelocytic leukaemia nuclear bodies function as antiviral defenses.
  • Viruses actively antagonize these nuclear defense mechanisms by altering subnuclear structures.

Conclusions:

  • The host cell nucleus is a dynamic battleground during viral infections.
  • Understanding nuclear alterations provides insights into viral replication strategies and host-pathogen interactions.
  • Targeting nuclear modifications could offer novel antiviral therapeutic strategies.