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Related Concept Videos

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...
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’...
LTR Retrotransposons03:08

LTR Retrotransposons

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...
Mechanisms of Retrovirus-induced Cancers01:51

Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
Mechanisms of Retrovirus-induced Cancers01:51

Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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...

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Related Experiment Video

Updated: May 10, 2026

Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites

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Retrointegration2023-Papers from the 7th International Conference on Retroviral Integration.

Alan N Engelman1, Duane P Grandgenett2, Goedele N Maertens3

  • 1Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.

Viruses
|July 30, 2025
PubMed
Summary
This summary is machine-generated.

Retroviral DNA integration into host chromosomes is crucial for virus replication. This process enables post-integration gene expression and new virus particle assembly, marking a key step in the viral life cycle.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Retroviral DNA integration into host chromosomal DNA is a critical step in the viral replication cycle.
  • This integration event signifies the transition from early viral infection stages to subsequent gene expression and particle production.

Discussion:

  • The integration process is a hallmark of retroviral infection, essential for establishing a persistent infection.
  • Understanding this mechanism is key to developing antiviral therapies targeting viral latency and replication.

Key Insights:

  • Integration of retroviral DNA into the host genome is a prerequisite for viral gene expression and progeny virion formation.
  • This process involves complex molecular machinery that inserts viral genetic material into the host DNA.

Outlook:

  • Further research into retroviral integration mechanisms can reveal novel therapeutic targets.
  • Investigating host-viral DNA interactions post-integration may lead to strategies for controlling persistent viral infections.