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Related Concept Videos

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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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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Reporter Genes02:11

Reporter Genes

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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

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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...
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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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Transposons01:24

Transposons

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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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Related Experiment Video

Updated: Dec 17, 2025

Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity
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Measuring and interpreting transposable element expression.

Sophie Lanciano1, Gael Cristofari2

  • 1UniversitĂ© CĂ´te d'Azur, Inserm, CNRS, IRCAN, Nice, France.

Nature Reviews. Genetics
|June 25, 2020
PubMed
Summary
This summary is machine-generated.

Transposable elements (TEs) are mobile DNA sequences that impact genome evolution. Accurately measuring TE expression is crucial for understanding their role in biology and disease.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Transposable elements (TEs) are significant drivers of eukaryotic genome plasticity.
  • TEs influence species adaptation, physiology, and disease by acting as insertional mutagens.
  • Understanding TE expression is key to elucidating their mobilization and impact on host genomes.

Purpose of the Study:

  • To review challenges in detecting transposable element (TE) expression.
  • To discuss experimental and computational strategies for accurate TE expression analysis.
  • To highlight the importance of TE expression in genome evolution and disease.

Main Methods:

  • Review of existing literature on TE expression analysis.
  • Discussion of computational challenges including mappability and sequence polymorphisms.
  • Examination of experimental techniques for TE transcript identification.

Main Results:

  • Most current RNA sequencing analysis tools misinterpret or discard TE-derived reads.
  • Accurate TE expression detection faces challenges like sequence polymorphisms and diverse TE transcription.
  • Newer methods are improving the identification of expressed TE loci and functional TE transcripts.

Conclusions:

  • Accurate measurement of TE expression is essential for understanding genome dynamics.
  • Overcoming computational and experimental hurdles is vital for advancing TE research.
  • Improved TE expression analysis will shed light on TE mobilization, gene regulation, and disease.