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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...
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...
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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Interview: HIV-1 Proviral DNA Excision Using an Evolved Recombinase
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Published on: June 17, 2008

Demystified. Human endogenous retroviruses.

P N Nelson1, P R Carnegie, J Martin

  • 1School of Applied Sciences, Division of Biomedical Science and Biosciences, University of Wolverhampton, Wolverhampton WV1 1SB, UK. P.N.Nelson@wlv.ac.uk

Molecular Pathology : MP
|February 1, 2003
PubMed
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Human endogenous retroviruses (HERVs) are ancient viral sequences in our DNA. While some HERVs may offer benefits, others are linked to cancer and autoimmune diseases, prompting further research.

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Last Updated: Jul 12, 2026

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Area of Science:

  • Genomics
  • Virology
  • Immunology

Background:

  • Human endogenous retroviruses (HERVs) are remnants of ancient retroviral infections integrated into the human genome.
  • These sequences constitute a significant portion of the human DNA, inherited across generations.
  • While often considered junk DNA, emerging evidence suggests HERVs may play roles in normal physiology and disease.

Purpose of the Study:

  • To provide a comprehensive overview of Human Endogenous Retroviruses (HERVs).
  • To elucidate the classification systems used for HERVs.
  • To explore the association of HERVs with human cancers and autoimmune diseases, and their potential biological roles.

Main Methods:

  • Literature review and synthesis of existing research on HERVs.
  • Analysis of classification schemes for HERVs.
  • Examination of studies linking HERVs to oncogenesis and autoimmunity.

Main Results:

  • HERVs are classified based on their sequence homology to exogenous retroviruses.
  • Specific HERV families have been implicated in the pathogenesis of various cancers.
  • Certain HERVs are associated with autoimmune conditions such as multiple sclerosis and rheumatoid arthritis.

Conclusions:

  • HERVs represent a complex component of the human genome with dual roles in health and disease.
  • Understanding HERV classification and their involvement in disease is crucial for developing novel therapeutic strategies.
  • Further investigation into the biological functions of HERVs is warranted to fully elucidate their impact on human health.