Synergistic Roles of FAHD-1 and PYC-1 in Mitochondrial Function, Behavior, and Longevity in C. elegans

Area of Science:

• Biochemistry
• Molecular Biology
• Gerontology

Background:

• Mitochondrial metabolism is crucial for physiology and aging.
• Oxaloacetate homeostasis is regulated by enzymes like FAHD-1 and PYC-1 in the TCA cycle.
• Understanding the interplay of these enzymes is key to aging research.

Purpose of the Study:

• To investigate the functional relationship between FAHD-1 (oxaloacetate decarboxylase) and PYC-1 (pyruvate carboxylase) in C. elegans.
• To determine how the balance of these enzymes affects mitochondrial function, reproduction, and lifespan.
• To explore the implications for conserved mechanisms linking metabolism and aging.

Main Methods:

• Generated single- and double-knockout C. elegans strains using CRISPR/Cas9.
• Analyzed mitochondrial respiration, motility, and reproductive parameters.
• Assessed lifespan and metabolic flexibility in mutant strains.

Main Results:

• FAHD-1 mutants showed impaired respiration, reduced motility, and early reproduction.
• PYC-1 mutants displayed increased locomotion and metabolic flexibility.
• Double mutants restored wild-type lifespan and partially normalized respiration, indicating a compensatory interaction.

Conclusions:

• FAHD-1 and PYC-1 act antagonistically to govern oxaloacetate homeostasis.
• The balance between these enzymes is critical for regulating locomotion, reproduction, and lifespan in C. elegans.
• This study provides a framework for understanding conserved links between mitochondrial enzymes and aging.