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DNA-only Transposons

DNA-only Transposons

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...

Transposons

Transposons

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...

Overview of Transposition and Recombination

Overview of Transposition and Recombination

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...

LTR Retrotransposons

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...

Non-LTR Retrotransposons

Non-LTR Retrotransposons

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...

Conservative Site-specific Recombination and Phase Variation

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...

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Related Experiment Video

Updated: Jun 26, 2026

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Published on: May 13, 2016

Transposon tools hopping in vertebrates.

Jun Ni¹, Karl J Clark, Scott C Fahrenkrug

¹Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA.

Briefings in Functional Genomics & Proteomics

|December 26, 2008

Summary

DNA transposon tools are vital for vertebrate genetics, aiding gene delivery and discovery. This review compares key systems for selecting optimal tools for applications like zebrafish manipulation and human gene therapy.

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Last Updated: Jun 26, 2026

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Gene Trapping Using Gal4 in Zebrafish

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Area of Science:

* Molecular Biology and Genetics
* Biotechnology and Genetic Engineering

Background:

* DNA transposons have emerged as powerful tools in vertebrate genetics over the last decade.
* Applications range from gene delivery and manipulation to gene discovery.
* Numerous complementary transposon-based systems are available, with more under development.

Purpose of the Study:

* To summarize and compare major DNA transposon vector systems currently active in vertebrates.
* To contrast the biochemical and in vivo properties of these systems.
* To guide future tool design and the development of new genetic applications.

Main Methods:

* Literature review and comparative analysis of existing DNA transposon systems.
* Evaluation of critical biochemical properties relevant to vector function.
* Assessment of in vivo performance characteristics in vertebrate models.

Main Results:

* Identification and categorization of major active DNA transposon vector systems in vertebrates.
* Comparative analysis highlighting the strengths and weaknesses of each system.
* Summary of key biochemical and in vivo properties influencing system efficacy.

Conclusions:

* Selecting the optimal DNA transposon system for specific vertebrate applications remains complex.
* Understanding the comparative properties of different systems is crucial for informed tool selection.
* This review provides a foundation for designing improved transposon-based genetic tools for diverse applications, including gene therapy.