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Related Concept Videos

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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 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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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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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 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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Related Experiment Video

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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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The genomic distribution of transposable elements is driven by spatially variable purifying selection.

Anna M Langmüller1,2, Viola Nolte1, Marlies Dolezal3

  • 1Institut für Populationsgenetik, Vetmeduni Vienna, Veterinärplatz 1, 1210 Wien, Austria.

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Purifying selection, not insertion bias, primarily shapes transposable element (TE) genomic distribution. Experimental evolution in Drosophila simulans revealed variable selection strengths across chromosomes, demonstrating TE dynamics.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Evolution

Background:

  • Genomic distribution of transposable elements (TEs) is thought to be shaped by purifying selection and insertion bias.
  • The relative contributions of these forces have been difficult to disentangle.
  • Previous studies proposed strong insertion biases for certain genomic regions.

Purpose of the Study:

  • To experimentally separate the effects of purifying selection and insertion bias on TE genomic distribution.
  • To investigate the evolutionary dynamics of transposable elements in Drosophila simulans.

Main Methods:

  • Development of an experimental system to distinguish purifying selection from TE insertion bias.
  • Utilizing experimental evolution over 10 generations in Drosophila simulans populations with numerous active P-element insertions.
  • Analysis of TE insertion patterns and selection pressures.

Main Results:

  • Strong selection against P-element insertions was observed after experimental evolution.
  • An exception was noted for insertions in regions with previously proposed strong insertion bias.
  • Purifying selection, with varying strength across chromosomes, was identified as the main driver of P-element genomic distribution.

Conclusions:

  • Purifying selection, not insertion bias, is the predominant force determining the genomic distribution of P-elements.
  • Different types of purifying selection act on base substitutions versus P-element insertions.
  • Experimental evolution is a powerful tool for studying evolutionary processes difficult to infer from natural variation.