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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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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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Extrachromosomal Circular DNA and Transposable Elements in Type 2 Diabetes.

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International Journal of Molecular Sciences
|December 11, 2025
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Summary

Transposable elements (TEs) and circular extrachromosomal DNA (eccDNA) are implicated in type 2 diabetes (T2D) pathogenesis and aging. Understanding these genetic factors may lead to new T2D prevention strategies.

Keywords:
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Area of Science:

  • Genetics
  • Metabolic Diseases
  • Molecular Biology

Background:

  • Type 2 Diabetes (T2D) results from complex genetic and environmental interactions.
  • Transposable elements (TEs) and circular extrachromosomal DNA (eccDNA) are linked to cellular aging and metabolic dysfunction.
  • While distinct, eccDNA can originate from TEs, suggesting shared or related mechanisms.

Purpose of the Study:

  • To review current knowledge on TEs and eccDNA in T2D.
  • To examine the association between T2D and TEs or eccDNA.
  • To highlight their role in aging and potential as T2D biomarkers.

Main Methods:

  • Literature review of studies on TEs, eccDNA, and T2D.
  • Analysis of reported associations and mechanistic insights.
  • Synthesis of findings regarding disease pathogenesis and aging.

Main Results:

  • TE activation and eccDNA production are implicated in T2D development.
  • These genetic elements are associated with cellular aging processes.
  • Evidence suggests distinct but potentially overlapping pathways involving TEs and eccDNA in T2D.

Conclusions:

  • TEs and eccDNA play a significant role in T2D pathogenesis, especially concerning aging.
  • These molecules show promise as potential biomarkers for T2D risk.
  • Targeting TEs and eccDNA could offer novel avenues for T2D prevention.