Related Experiment Video
Updated: Nov 28, 2025
09:13
Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
Published on: August 12, 2018
15.3K
SUMO Wrestles with Mitophagy to Extend Lifespan
James W Larrick1,2, Jasmine W Larrick3, Andrew R Mendelsohn1,2
1Panorama Research Institute, Sunnyvale, California, USA.
Rejuvenation Research
|December 1, 2020
Summary
Small Ubiquitin-like MOdifier (SUMO) gene, smo-1, impacts aging in C. elegans. While knockdown shortens lifespan, its role in mitochondrial health suggests complex anti-aging therapeutic potential.
Area of Science:
- Molecular Biology
- Aging Research
- Cellular Homeostasis
Background:
- SUMOylation is a crucial post-translational modification regulating diverse biological processes, including aging.
- The Small Ubiquitin-like MOdifier (SUMO) gene, smo-1, is the sole SUMO gene in C. elegans.
- Mitochondrial dynamics, including fission and mitophagy, are vital for maintaining cellular health during aging.
Purpose of the Study:
- To investigate the role of smo-1 in aging and mitochondrial homeostasis in C. elegans.
- To explore the impact of smo-1 modulation on lifespan and mitochondrial function.
- To examine the relationship between SUMOylation and key aging regulators like DAF-16 and SKN-1.
Main Methods:
- RNAi knockdown of the smo-1 gene in C. elegans.
- Overexpression of smo-1 in the intestine of C. elegans.
- Analysis of lifespan, mitochondrial fission, and mitophagy.
- Investigating the SUMOylation status of DAF-16 and SKN-1.
Main Results:
- RNAi knockdown of smo-1 shortened C. elegans lifespan.
- Intestinal overexpression of smo-1 modestly increased lifespan.
- Smo-1 is essential for tissue-specific mitochondrial fission, which is required for mitophagy.
- SUMOylation affects DAF-16 and SKN-1, critical regulators of mitochondrial homeostasis.
Conclusions:
- SUMOylation plays a significant role in regulating mitochondrial homeostasis and aging in C. elegans.
- While smo-1 shows potential in modulating aging, its modest lifespan effects and broad impact warrant caution for direct anti-aging therapeutic translation.
- SUMOylation pathways, despite therapeutic development for other diseases, may present suboptimal targets for anti-aging interventions.
Related Concept Videos
01:37Mitochondria
18.2K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
18.2K
01:27Autophagy
5.4K
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
5.4K
01:18Autophagic Cell Death
3.8K
Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
3.8K
01:19Translocation of Proteins into the Mitochondria
10.4K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
10.4K
01:36Delivery Pathways to the Lysosome
8.5K
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
8.5K
01:39Mitochondrial Protein Sorting
5.3K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
5.3K