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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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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.
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Overview of Transposition and Recombination02:13

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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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Related Experiment Video

Updated: Jun 30, 2025

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing
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Technical considerations for cost-effective transposon directed insertion-site sequencing (TraDIS).

Yasuhiro Kyono1, Madeline Tolwinski1, Stephanie A Flowers2

  • 1Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 833 S Wood St. #125B, Chicago, IL, 60612, USA.

Scientific Reports
|March 22, 2024
PubMed
Summary

This study refines Transposon directed insertion-site sequencing (TraDIS) protocols by optimizing electroporation and post-electroporation conditions. These improvements enhance mutant library complexity and streamline workflows for essential bacterial gene identification.

Keywords:
Escherichia coliElectroporationIllumina library preparationTransposon insertion sequencing

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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Transposon directed insertion-site sequencing (TraDIS) is a high-throughput method for identifying essential bacterial genes.
  • Existing TraDIS protocols often require extensive optimization due to laboratory environment variability.
  • Streamlining TraDIS protocols can increase accessibility for broader scientific application.

Purpose of the Study:

  • To refine the TraDIS protocol for improved efficiency and reproducibility.
  • To identify key parameters affecting mutant library complexity in TraDIS.
  • To simplify the sequencing library preparation workflow for TraDIS.

Main Methods:

  • Optimization of electroporation parameters (transposome concentration, assembly, cell density).
  • Evaluation of post-electroporation conditions (recovery time, selection media).
  • Development of a simplified Nextera-TruSeq hybrid sequencing library preparation method.

Main Results:

  • Adjusted electroporation parameters significantly improved viable mutant recovery in Escherichia coli.
  • Post-electroporation conditions were found to impact viable mutant library complexity.
  • A simplified library preparation workflow achieved ~80% transposon-DNA junction reads.

Conclusions:

  • Protocol refinements enhance TraDIS efficiency and mutant library complexity.
  • Simplified workflows make TraDIS more accessible to researchers.
  • Optimized TraDIS protocols facilitate essential bacterial gene discovery.