Different gametogenesis states uniquely impact longevity in Caenorhabditis elegans

Area of Science:

• Genetics
• Metabolism
• Aging Research

Background:

• Reproduction influences lifespan and fat metabolism across species.
• Germline ablation in C. elegans extends lifespan and increases fat storage.
• Distinct germline anomalies offer insights into longevity and metabolic regulation.

Purpose of the Study:

• To compare the effects of different germline mutations (germline-less, feminized, masculinized) on lifespan and fat metabolism in C. elegans.
• To investigate the genetic pathways and molecular mechanisms underlying these effects.
• To explore the role of DAF-16/FOXO in mediating longevity outcomes.

Main Methods:

• Comparative analysis of metabolomic and transcriptomic data from three sterile C. elegans mutants: glp-1, fem-3, and mog-3.
• Genetic pathway analysis to identify shared and distinct molecular changes.
• Lifespan assays and temperature-dependent survival studies.
• Investigated the requirement of daf-16/FOXO in mutant phenotypes.

Main Results:

• All three sterile mutants (glp-1, fem-3, mog-3) accumulate excess fat and show altered expression of stress response and metabolism genes.
• glp-1 mutants exhibit the most significant lifespan extension.
• fem-3 mutants show temperature-dependent lifespan extension requiring daf-16/FOXO.
• mog-3 mutants are short-lived, with daf-16/FOXO being dispensable, and partially mimic male-induced demise.

Conclusions:

• Disrupting specific germ cell populations leads to distinct physiological and longevity outcomes in C. elegans.
• The interplay between germline integrity, metabolism, and lifespan is complex and mutation-specific.
• C. elegans sterile mutants provide valuable models for studying reproductive trade-offs and aging mechanisms, including sex-dependent effects.