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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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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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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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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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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Updated: Aug 30, 2025

Tissue Collection of Bats for -Omics Analyses and Primary Cell Culture
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Transposable Elements in Bats Show Differential Accumulation Patterns Determined by Class and Functionality.

Nicole S Paulat1, Erin McGuire2, Krishnamurthy Subramanian2,3

  • 1Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA.

Life (Basel, Switzerland)
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Bat genomes host diverse transposable elements (TEs). These TEs show distinct insertion patterns, with depletion in coding regions and enrichment near genes, reflecting a balance between insertion preference and selection.

Keywords:
genome evolutioninsertion preferencetransposable elements

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Bat genomes possess a rich variety of transposable elements (TEs).
  • Vespertilionidae bats feature both active retrotransposons and DNA transposons.
  • TEs accumulate distinct patterns and exhibit specific target site preferences.

Purpose of the Study:

  • To investigate how diverse TEs influence bat genome structure.
  • To analyze spatial distribution patterns of different TE classes relative to genomic features.

Main Methods:

  • Comparative spatial analyses of TE classes and genomic features (genic regions, CpG islands).
  • Examination of TE insertion patterns and target site preferences in bat genomes.

Main Results:

  • All TEs were depleted within coding sequences.
  • TEs exhibited species- and element-specific attraction patterns within transcripts.
  • Significant TE activity was observed in regions adjacent to genes, particularly small, non-autonomous TEs in introns.

Conclusions:

  • Genomic distribution of TEs is shaped by a balance between insertion preferences in open chromatin and purifying selection within genes.
  • TEs play a role in shaping genome structure in bats.
  • Bat genomes serve as a valuable model for studying TE insertion diversity.