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Related Concept Videos

DNA-only Transposons02:57

DNA-only Transposons

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
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Transposons01:24

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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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LTR Retrotransposons03:08

LTR Retrotransposons

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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.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
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An Efficient In Vitro Transposition Method by a Transcriptionally Regulated Sleeping Beauty System Packaged into an Integration Defective Lentiviral Vector
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DNA transposon-based gene vehicles - scenes from an evolutionary drive.

Kristian Alsbjerg Skipper, Peter Refsing Andersen, Nynne Sharma

  • 1Department of Biomedicine, Aarhus University, Wilh, Meyers Allé 4, DK-8000, Aarhus C, Denmark. giehm@hum-gen.au.dk.

Journal of Biomedical Science
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Summary

DNA transposons, primitive genetic elements, are being adapted for gene transfer. Understanding their evolution helps create safer and more efficient gene therapy vectors.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • DNA transposons are mobile genetic elements found across diverse organisms, influencing genome evolution.
  • These elements replicate and transpose via transposase enzymes, adapting to host environments and facing self-regulation and host defense mechanisms.
  • The Sleeping Beauty DNA transposon exemplifies the potential of these elements in biomedical applications, including gene therapy.

Purpose of the Study:

  • To connect the evolutionary mechanisms of DNA transposons with the practical challenges of using them for gene transfer.
  • To highlight how understanding transposon evolution can inform the development of improved gene transfer vectors.
  • To advocate for parallel development of diverse transposon-based vector systems for broader gene transfer applications.

Main Methods:

  • This review synthesizes existing literature on DNA transposon evolution and their application in gene transfer.
  • It analyzes the inherent traits of transposons that may impact their use as vectors.
  • The review draws parallels between evolutionary pressures on transposons and the requirements for effective gene therapy vectors.

Main Results:

  • DNA transposon-derived vectors may inherit limitations from their ancestral elements.
  • Evolutionary insights reveal strategies for overcoming transposon inactivation and suppression.
  • Optimized DNA transposon vectors have advanced to clinical trials, demonstrating therapeutic potential.

Conclusions:

  • A deep understanding of transposon evolutionary history is crucial for harnessing their potential in gene transfer.
  • Developing distinct transposon-based vector systems in parallel will enhance gene transfer applications.
  • Leveraging evolutionary principles can lead to the creation of safer, more efficient, and robust gene therapy vehicles.