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What are Viruses?

What are Viruses?

Intracellular Movement of Viruses and Bacteria

Intracellular Movement of Viruses and Bacteria

Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...

Introduction to Virus

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...

Retrovirus Life Cycles

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...

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

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Related Experiment Video

Updated: Jun 5, 2026

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

Published on: January 18, 2018

How viruses access the nucleus.

Sarah Cohen¹, Shelly Au, Nelly Panté

¹Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, British Columbia, Canada.

Biochimica Et Biophysica Acta

|December 21, 2010

Summary

This summary is machine-generated.

Viruses use diverse strategies to deliver their genetic material into the host cell nucleus for replication. These viral genome delivery mechanisms depend on virus structure and cellular signals.

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Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

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

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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus

Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus

Published on: July 27, 2021

Area of Science:

Virology
Cell Biology
Molecular Biology

Background:

Viral replication often necessitates the transport of viral genetic material into the host cell's nucleus.
Understanding nucleocytoplasmic transport is crucial for deciphering viral infection mechanisms.

Purpose of the Study:

To review the diverse strategies viruses employ for nuclear genome delivery.
To summarize the principles of nucleocytoplasmic transport relevant to viral entry.

Main Methods:

Review of existing literature on viral nuclear import mechanisms.
Categorization of viral genome delivery strategies based on entry pathways.

Main Results:

Viruses utilize at least five distinct mechanisms for nuclear entry, including during mitosis, through the nuclear pore complex (NPC), or via nuclear envelope disruption.
The specific strategy employed is dictated by viral size, structure, and interaction with cellular cues.
Mechanisms involve direct genome passage, capsid docking, intact capsid entry, or release following cytoplasmic genome release.

Conclusions:

Viral nuclear import is a complex process involving tailored strategies to overcome cellular barriers.
The choice of nuclear entry mechanism highlights the adaptability of viruses in exploiting host cell machinery.