Repetitive elements in aging and neurodegeneration.

Area of Science:

• Genomics
• Neuroscience
• Molecular Biology

Background:

• Repetitive elements (REs), including transposable elements (TEs) and satellite DNA, constitute a significant portion of eukaryotic genomes.
• Dysregulation of REs has been implicated in various cellular processes and disease states.

Purpose of the Study:

• To review the potential contribution of TEs and satellite DNA to aging and neurodegenerative disorders.
• To explore the molecular mechanisms by which REs may induce neurodegeneration.
• To discuss therapeutic strategies targeting REs for neurodegenerative diseases.

Main Methods:

• Literature review of studies on REs, aging, and neurodegenerative disorders.
• Analysis of mechanisms including DNA damage, protein sequestration, insertional mutagenesis, and inflammation.
• Examination of specific TE families (e.g., gypsy, HERV-K, HERV-W) and their interactions with cellular factors (e.g., TDP-43, RNA silencing systems).

Main Results:

• Alterations in RE expression and activity can negatively impact lifespan, induce neurodegeneration, and impair cognitive and motor functions.
• REs can contribute to cellular dysfunction through various mechanisms, including DNA damage and inflammatory responses.
• Interactions between TEs, TDP-43, and RNA silencing pathways (siRNA, piRNA) are crucial in neurodegeneration.

Conclusions:

• Repetitive elements are emerging as significant contributors to aging and neurodegenerative conditions.
• Targeting REs, potentially through therapeutic silencing, represents a promising avenue for mitigating neurodegenerative disorders.
• Further research, particularly in mammalian models, is necessary to fully elucidate the role of TEs in neurodegeneration.