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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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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.
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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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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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Transposable element-derived sequences in vertebrate development.

Ema Etchegaray1, Magali Naville2, Jean-Nicolas Volff2

  • 1Institut de Genomique Fonctionnelle de Lyon, Univ Lyon, CNRS UMR 5242, Ecole Normale Superieure de Lyon, Universite Claude Bernard Lyon 1, 46 allee d'Italie, F-69364, Lyon, France. ema.etchegaray@ens-lyon.fr.

Mobile DNA
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

Transposable elements (TEs) can be exapted by vertebrates, providing novel genetic material. These exapted TEs have driven evolutionary innovations in vertebrate development and success.

Keywords:
DevelopmentExaptationGenetic innovationGenome evolutionTransposable elementsVertebrates

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Developmental Biology

Background:

  • Transposable elements (TEs) are abundant in vertebrate genomes, often causing instability.
  • TEs can be exapted, becoming beneficial through positive selection in specific genomic contexts.
  • Exaptation of TEs generates novel genetic elements, including regulatory sequences, exons, genes, and non-coding RNAs.

Purpose of the Study:

  • To review the role of transposable element exaptation in vertebrate developmental innovations.
  • To illustrate how TE-derived sequences contribute to the evolution of derived vertebrate traits.
  • To highlight the impact of TE exaptation on the evolutionary success of vertebrates.

Main Methods:

  • Review of existing literature on transposable elements and vertebrate evolution.
  • Analysis of genomic data to identify exapted TE sequences in vertebrate genomes.
  • Case studies illustrating TE-derived developmental innovations in vertebrates.

Main Results:

  • TE exaptation is a significant source of evolutionary novelty in vertebrates.
  • TE-derived sequences have contributed to key vertebrate traits like bones, adaptive immunity, and complex brains.
  • Exapted TEs play diverse beneficial roles for the host organism.

Conclusions:

  • Transposable element exaptation is a crucial mechanism driving vertebrate evolution.
  • Understanding TE exaptation provides insights into the origin of vertebrate-specific traits.
  • TEs are not merely genomic parasites but also engines of evolutionary innovation.