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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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Updated: May 17, 2025

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
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Retrotransposon Protein L1 ORF1p Expression in Aging Central Nervous System.

Laura Vallés-Saiz1, Aaron Abdelkader-Guillén1, Jesús Ávila1

  • 1Centro de Biología Molecular Severo Ochoa, CSIC/UAM, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.

International Journal of Molecular Sciences
|May 14, 2025
PubMed
Summary

Long interspersed elements (LINE-1; L1) show increased activity in aging mouse brains. This study reveals L1 protein presence in various brain cells and links it to neuroinflammation, suggesting a role in neurological aging.

Keywords:
LINE-1ORP1pagingmicrogliaretrotransposons

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Area of Science:

  • Genetics
  • Neuroscience
  • Aging Research

Background:

  • Long interspersed elements (LINE-1; L1) are active retrotransposons comprising ~17% of the human genome.
  • L1 retrotransposition is regulated by cellular mechanisms, but age-related decline may increase risks.
  • Genomic integrity is crucial in the Central Nervous System (CNS) due to limited regeneration.

Purpose of the Study:

  • To investigate the age-associated changes in L1 activity within the mouse brain.
  • To determine the cellular distribution of L1 proteins in the CNS.
  • To explore the relationship between L1 activity and neuroinflammation during aging.

Main Methods:

  • Analysis of ORF1p expression in aging mouse brains.
  • Immunohistochemical detection of ORF1p in various CNS cell types (neurons, oligodendrocytes, microglia).
  • Correlation analysis between ORF1p presence and microglial activation markers.

Main Results:

  • An age-associated upregulation of ORF1p was observed in the mouse brain.
  • ORF1p was detected in neurons, oligodendrocytes, and microglia.
  • ORF1p presence correlated with microglial activation, a marker of neuroinflammation.

Conclusions:

  • L1 retrotransposon activity, specifically ORF1p, is upregulated in the aging mouse brain.
  • L1 proteins are present in diverse CNS cell types and are associated with age-related microglial activation and neuroinflammation.
  • These findings highlight the potential role of L1 dynamics in age-related neurological changes.