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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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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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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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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity
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On the Base Composition of Transposable Elements.

Stéphane Boissinot1

  • 1Center for Genomics and Systems Biology, New York University Abu Dhabi, Saadiyat Island, Abu Dhabi P.O. Box 129188, United Arab Emirates.

International Journal of Molecular Sciences
|May 14, 2022
PubMed
Summary
This summary is machine-generated.

Transposable elements, often AT-rich, have unusual base compositions impacting host genomes. Selection appears to drive this maladaptive trait, though the exact reasons require further investigation.

Keywords:
GC contentbase compositioncodon biastransposable elements

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Area of Science:

  • Genomics
  • Molecular Evolution
  • Bioinformatics

Background:

  • Transposable elements (TEs) display distinct nucleotide compositions compared to host genomes.
  • A common bias is AT-richness, though variations exist within genomes.
  • This AT-richness can negatively affect TE transcription and translation.

Purpose of the Study:

  • To review current knowledge on TE nucleotide content.
  • To explore how TE base composition influences host genomes and TE replication.
  • To investigate the underlying causes of TE compositional bias.

Main Methods:

  • Literature review of studies on transposable element nucleotide content.
  • Analysis of potential evolutionary processes contributing to base composition bias.
  • Discussion of the interplay between TE composition, host genome, and replication.

Main Results:

  • TEs often exhibit AT-richness, deviating from genomic averages.
  • This AT-richness can be detrimental to TE function (transcription, translation).
  • Multiple factors, including horizontal transfer, mutational bias, and selection, likely contribute to TE compositional bias.

Conclusions:

  • Mutation alone cannot account for the high AT-content of TEs.
  • Selection plays a significant role in shaping TE base composition.
  • The evolutionary drivers favoring this seemingly maladaptive AT-richness in TEs remain an open question requiring further research.