Transposable Element Landscape in Drosophila Populations Selected for Longevity

Area of Science:

• Genetics
• Aging Research
• Genomics

Background:

• Transposable elements (TEs) can negatively impact health and fitness by integrating into the genome.
• TE activity increases with age, contributing to genomic instability and age-related diseases.
• It is hypothesized that long-lived individuals possess enhanced TE silencing mechanisms.

Purpose of the Study:

• To investigate the relationship between TE insertions, expression, and longevity in Drosophila melanogaster.
• To determine if populations selected for longevity exhibit different TE profiles compared to controls.

Main Methods:

• Genome-wide analysis of TE insertions and expression in Drosophila melanogaster populations selected for longevity.
• RNA sequencing (RNA-seq) to quantify TE expression levels.
• Simulations to assess TE abundance under neutrality.

Main Results:

• Long-lived populations showed higher overall TE family abundance than controls, contrary to initial hypotheses.
• A trend towards reduced TE expression was observed in selected populations.
• Telomeric TEs were more abundant both genomically and transcriptionally in long-lived flies.

Conclusions:

• Increased TE abundance in long-lived flies suggests reproduction at old age facilitates TE transmission.
• Reduced TE expression, especially of telomeric TEs, may be a key mechanism for promoting longevity.
• Improved telomere maintenance linked to TEs presents a novel pathway for lifespan extension.