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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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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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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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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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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.
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Reverse Genetics to Engineer Positive-Sense RNA Virus Variants
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Reverse Genetics Systems for Filoviruses.

Thomas Hoenen1,2, Heinz Feldmann3

  • 1Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA. thomas.hoenen@fli.bund.de.

Methods in Molecular Biology (Clifton, N.J.)
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

Scientists created new infectious filoviruses using complementary DNA (cDNA) reverse genetics. This breakthrough enables enhanced study of filovirus biology and the development of vital countermeasures against these dangerous pathogens.

Keywords:
Ebola virusFilovirusesFull-length clone systemInfectious cloneLife-cycle modeling systemMarburg virusMinigenomeReverse geneticstrVLP system

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Area of Science:

  • Virology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Filoviruses are highly pathogenic viruses posing significant threats to human health.
  • Understanding filovirus replication and pathogenesis is crucial for developing effective treatments.
  • Reverse genetics systems offer powerful tools for studying viral mechanisms.

Purpose of the Study:

  • To describe the generation of recombinant filoviruses from complementary DNA (cDNA).
  • To establish a system for producing infectious filoviruses for research purposes.
  • To facilitate the screening of potential antiviral countermeasures.

Main Methods:

  • Utilizing full-length clone systems for reverse genetics.
  • Cloning filovirus genetic material into cDNA.
  • Generating infectious recombinant filoviruses from engineered cDNA constructs.

Main Results:

  • Successfully generated recombinant filoviruses from cDNA.
  • Demonstrated the utility of the developed system for producing viable viruses.
  • Established a foundation for further research into filovirus biology.

Conclusions:

  • The described method provides a robust platform for generating recombinant filoviruses.
  • This advancement is critical for in-depth studies of filovirus pathogenesis.
  • The system supports the development and screening of novel antiviral strategies.