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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 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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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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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Structural heterogeneity and functional convergence of transposable elements.

Gleb Yu Kosovsky1, Galina V Glazko2, Tatiana T Glazko1

  • 1Department of Biotechnology, Afanas'ev Research Institute of Fur-Bearing Animal Breeding and Rabbit Breeding, Moscow, Russia.

Frontiers in Genetics
|January 1, 2026
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Summary

Transposable element (TE) frequencies in mammalian genomes are species-specific, not influenced by gene characteristics. Ancient and young TEs show distinct correlations, suggesting regulatory interactions shape TE amplification.

Keywords:
evolutionarily conservedregulatory elementsspandrelstransposons“ancient” and “young” repeats

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Mammalian genomes are substantially composed of transposable elements (TEs).
  • TE distribution can correlate with genomic rearrangements and gene localization.
  • Understanding TE distribution is crucial for comprehending genome evolution.

Purpose of the Study:

  • To analyze the local genomic distribution of various TEs in humans, cattle, and rabbits.
  • To investigate the relationship between TE frequencies and gene characteristics (length, function, chromosomal localization).
  • To explore species-specific differences in TE composition and ancient/young TE ratios.

Main Methods:

  • Comparative genomic analysis of TE distribution across three mammalian species.
  • Examination of TEs within and flanking protein-coding genes of varying functions and locations.
  • Statistical analysis of correlations between different TE types and age categories.

Main Results:

  • TE frequencies are species-specific and independent of gene length, function, or chromosomal localization.
  • Significant species-specific differences observed in the ratios of ancient versus young short interspersed nuclear elements (SINEs) and long interspersed nuclear elements (LINEs).
  • Positive correlation between ancient SINEs/LINEs and LTR-ERVs; negative correlation between young SINEs/LINEs and DNA transposons.

Conclusions:

  • TE distribution patterns are primarily determined by species-specific factors rather than gene-associated features.
  • Interactions and competitive relationships between TEs, potentially mediated by regulatory motifs, influence their amplification.
  • Host regulatory systems play a role in the amplification dynamics of transposable elements.