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Related Concept Videos

Overview of Transposition and Recombination02:13

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...
DNA-only Transposons02:57

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...
Transposons01:24

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...
LTR Retrotransposons03:08

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 Retrotransposons03:18

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...
Transgenic Organisms00:53

Transgenic Organisms

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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity
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Transposable elements and their identification.

Wojciech Makałowski1, Amit Pande, Valer Gotea

  • 1Institute of Bioinformatics, University of Muenster, Muenster, Germany. wojmak@uni-muenster.de

Methods in Molecular Biology (Clifton, N.J.)
|March 13, 2012
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Summary

Transposable elements (TEs) are abundant in genomes, posing challenges for analysis but offering insights into cellular processes and genomic evolution. This study reviews TE biodiversity, impact, and detection methods.

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Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Genomes contain numerous mobile genetic sequences known as transposable elements (TEs).
  • TEs present significant challenges for accurate genome analysis and annotation.
  • Despite challenges, TEs are integral to various cellular processes and genomic evolution.

Purpose of the Study:

  • To provide a comprehensive overview of transposable element (TE) biodiversity.
  • To elucidate the impact of TEs on genomic evolution.
  • To discuss current methodologies for TE detection and analysis.

Main Methods:

  • Literature review and synthesis of existing research on TEs.
  • Comparative analysis of different TE types and their genomic distribution.
  • Evaluation of computational and experimental approaches for TE identification.

Main Results:

  • TEs exhibit vast biodiversity across different taxa.
  • TEs significantly influence genome structure, function, and evolution through various mechanisms.
  • Multiple computational tools and experimental strategies exist for TE detection, each with strengths and limitations.

Conclusions:

  • Understanding TE biodiversity and impact is crucial for advancing genome analysis.
  • Effective detection and analysis strategies are essential for studying TE roles in biology.
  • Further research is needed to fully comprehend the dynamic interplay between TEs and host genomes.