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Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans
Published on: December 9, 2022
A conserved ubiquitination pathway determines longevity in response to diet restriction
Andrea C Carrano1, Zheng Liu, Andrew Dillin
1Molecular and Cell Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Nature
|June 26, 2009
Summary
Dietary restriction extends lifespan through the HECT E3 ubiquitin ligase WWP-1 and UBC-18 enzyme in C. elegans. WWP-1
Area of Science:
- Cellular Biology
- Genetics
- Aging Research
Background:
- Dietary restriction (DR) is a conserved intervention that extends lifespan across diverse species.
- This suggests underlying conserved mechanisms involving nutrient sensing and prosurvival pathways.
- Understanding these pathways is crucial for developing strategies to promote healthy aging.
Purpose of the Study:
- To investigate the role of the HECT E3 ubiquitin ligase WWP-1 in regulating lifespan in response to dietary restriction.
- To identify downstream factors and enzymatic requirements for WWP-1 mediated longevity.
- To elucidate the specific contribution of WWP-1 to DR-induced lifespan extension.
Main Methods:
- Utilized the model organism Caenorhabditis elegans.
- Manipulated the expression of wwp-1 (wild-type and catalytic-dead mutant) and ubc-18.
- Assessed lifespan under conditions of ad libitum feeding and dietary restriction.
- Investigated genetic dependencies including pha-4 and daf-16.
Main Results:
- Overexpression of wwp-1 extended lifespan by up to 20% in C. elegans.
- WWP-1's longevity-promoting effect was dependent on the FOXA transcription factor pha-4 but not DAF-16.
- Loss of wwp-1 function suppressed DR-induced longevity, while its catalytic activity was essential.
- The E2 ubiquitin conjugating enzyme UBC-18 was found to be essential and specific for DR-induced longevity, interacting with WWP-1.
Conclusions:
- WWP-1 acts as a positive regulator of lifespan in response to dietary restriction in C. elegans.
- The ubiquitin ligase activity of WWP-1, in conjunction with UBC-18, is critical for DR-mediated longevity.
- These findings reveal a novel ubiquitin ligase pathway involving WWP-1 and UBC-18 that regulates lifespan under nutrient-limited conditions.
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