Identification of Caenorhabditis elegans genes regulating longevity using enhanced RNAi-sensitive strains

Area of Science:

• Genetics
• Aging Research
• Molecular Biology

Background:

• Understanding the genetic and molecular mechanisms that regulate lifespan is crucial for addressing age-related diseases.
• Previous studies have implicated metabolism, stress resistance, and genomic stability in longevity.

Purpose of the Study:

• To systematically identify genes that regulate lifespan through a genome-wide RNA interference screen in Caenorhabditis elegans.
• To characterize the mechanisms underlying lifespan extension, focusing on metabolic, mitochondrial, lysosomal, and stress resistance pathways.

Main Methods:

• A genome-wide RNA interference screen was conducted in a Caenorhabditis elegans strain (lin-15b;eri-1) with enhanced double-stranded RNA response.
• 16,757 genes were examined, followed by stringent longitudinal analysis of 115 lifespan-extending gene inactivations.
• Key lifespan-extending genes were further validated in eri-1 and eri-3 mutant strains.

Main Results:

• 115 gene inactivations were found to extend lifespan, with 18 showing the most significant effects (10-90% increase).
• Most identified genes reduced the rate of aging, indicating a slower aging process.
• Genes critical for metabolism, mitochondrial function, lysosomal function, genomic stability, and stress resistance were identified as key longevity regulators.

Conclusions:

• Metabolism, mitochondrial and lysosomal functions, genomic stability, and stress resistance are critical determinants of animal lifespan.
• Lifespan extension can occur through diverse mechanisms, including enhanced stress resistance and altered lysosomal function.
• The study reinforces the complex interplay of various biological pathways in regulating aging and longevity.