Age Deceleration and Reversal Gene Patterns in Dauer Diapause.

Area of Science:

• Gerontology and Molecular Biology
• Developmental Biology

Background:

• Aging is linked to decreased function and increased disease risk.
• Understanding natural aging deceleration and rejuvenation mechanisms is crucial for healthspan.
• The Caenorhabditis elegans dauer stage offers a model for studying longevity and age reversal.

Purpose of the Study:

• To investigate the gene expression changes during the C. elegans dauer stage and upon exit.
• To assess the impact of dauer and dauer exit on biological age using a transcriptome aging clock (BiT Age).
• To uncover mechanisms of age deceleration and rejuvenation in a natural animal model.

Main Methods:

• Transcriptomic analysis of C. elegans during dauer and dauer exit.
• Assessment of biological age using the BiT Age transcriptome clock.
• Analysis of transcription-blocking lesions and repair mechanisms.

Main Results:

• The dauer stage showed decelerated biological aging compared to chronological age.
• Dauer exit led to age reversal, with biological age decreasing.
• Transcriptomic data revealed metabolic shifts and enhanced biomolecular degradation during dauer, which were reversed upon exit.
• Transcription-coupled nucleotide excision repair resolved transcription stress during dauer exit.

Conclusions:

• The C. elegans dauer stage represents a state of natural age deceleration.
• Dauer exit facilitates rejuvenation, restoring normal lifespan and fecundity.
• These findings provide insights into molecular mechanisms underlying age reversal and disease prevention.