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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...
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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.
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Transposon tagging in diploid strawberry.

Richard E Veilleux1, Kerri P Mills, Aaron J Baxter

  • 1Department of Horticulture, Virginia Tech, Blacksburg, VA, USA. potato@vt.edu

Plant Biotechnology Journal
|August 1, 2012
PubMed
Summary

Maize transposon tagging in Fragaria vesca enabled the identification of 103 unique Ds element transposants, with insertion sites dispersed across the strawberry genome. This system facilitates efficient generation and cataloging of transposon-tagged mutants for genetic research.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Genomics

Background:

  • Transposon tagging is a powerful tool for genetic analysis and mutant generation.
  • Developing efficient transposon tagging systems in crop species like strawberry (Fragaria vesca) is crucial for functional genomics.

Purpose of the Study:

  • To establish and characterize a maize transposon tagging system in Fragaria vesca.
  • To identify and analyze germ-line transposition events and Ds insertion sites in the strawberry genome.
  • To create a cataloged collection of transposon-tagged mutants.

Main Methods:

  • Transformation of Fragaria vesca with a maize Ac/Ds transposon system.
  • Screening of primary transgenics (T₀) and progeny (T₁) for transposition events using multiplex PCR.
  • High-throughput inverse PCR (hiTAIL-PCR) for sequencing Ds insertion sites.
  • Analysis of insertion site distribution within gene elements and intergenic regions.
  • Development of a three-primer PCR method for identifying homozygous T₂ transposants.

Main Results:

  • Successful transformation and establishment of a functional Ac/Ds transposon system in Fragaria vesca.
  • Identification of 103 unique Ds transposants from over 2400 T₁ plants screened.
  • Transposition frequency in launch pads ranged from 16% to 40%.
  • Ds insertion sites were found in exons (15%), introns (23%), promoters (30%), 3' UTRs (17%), and intergenic regions (15%).
  • 17 somatic transpositions were observed in the T₀ generation.
  • A three-primer PCR assay was validated for identifying homozygous T₂ transposants.
  • A comprehensive online database of the mutant collection was established.

Conclusions:

  • The developed maize transposon tagging system is effective for generating a diverse collection of mutants in Fragaria vesca.
  • The characterized insertion sites provide valuable information for understanding gene function and genome organization.
  • The established online database facilitates the utilization of these transposon-tagged mutants for future research.