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High-throughput Screening and Biosensing with Fluorescent C. elegans Strains
Published on: May 19, 2011
SKN-1 links C. elegans mesendodermal specification to a conserved oxidative stress response
Jae Hyung An1, T Keith Blackwell
1Center for Blood Research and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Abstract:
During the earliest stages of Caenorhabditis elegans embryogenesis, the transcription factor SKN-1 initiates development of the digestive system and other mesendodermal tissues. Postembryonic SKN-1 functions have not been elucidated. SKN-1 binds to DNA through a unique mechanism, but is distantly related to basic leucine-zipper proteins that orchestrate the major oxidative stress response in vertebrates and yeast. Here we show that despite its distinct mode of target gene recognition, SKN-1 functions similarly to resist oxidative stress in C. elegans. During postembryonic stages, SKN-1 regulates a key Phase II detoxification gene through constitutive and stress-inducible mechanisms in the ASI chemosensory neurons and intestine, respectively. SKN-1 is present in ASI nuclei under normal conditions, and accumulates in intestinal nuclei in response to oxidative stress. skn-1 mutants are sensitive to oxidative stress and have shortened lifespans. SKN-1 represents a connection between developmental specification of the digestive system and one of its most basic functions, resistance to oxidative and xenobiotic stress. This oxidative stress response thus appears to be both widely conserved and ancient, suggesting that the mesendodermal specification role of SKN-1 was predated by its function in these detoxification mechanisms.
Insights
The transcription factor SKN-1, crucial for early development in C. elegans, also protects against oxidative stress in later life stages. This ancient detoxification function likely predates its role in mesendodermal tissue specification.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- SKN-1 is a transcription factor essential for early Caenorhabditis elegans embryogenesis, specifying mesendodermal tissues.
- The postembryonic functions of SKN-1 and its role in stress response remain largely uncharacterized.
- SKN-1's DNA-binding mechanism is unique, though it shares distant homology with oxidative stress-related proteins in other species.
Purpose of the Study:
- To elucidate the postembryonic functions of SKN-1 in Caenorhabditis elegans.
- To investigate SKN-1's role in oxidative stress resistance and detoxification pathways.
- To explore the evolutionary origins of SKN-1's functions, connecting development and stress response.
Main Methods:
- Analysis of SKN-1's role in postembryonic development and stress resistance in C. elegans.
- Investigation of SKN-1's regulation of a Phase II detoxification gene in ASI neurons and intestine.
- Microscopy to observe SKN-1 localization in ASI and intestinal nuclei under normal and stress conditions.
- Phenotypic analysis of skn-1 mutants under oxidative stress and lifespan assessment.
Main Results:
- SKN-1 mediates oxidative stress resistance in C. elegans during postembryonic stages.
- SKN-1 regulates a key Phase II detoxification gene constitutively in ASI neurons and inducibly in the intestine.
- SKN-1 localizes to ASI nuclei normally and accumulates in intestinal nuclei upon oxidative stress.
- skn-1 mutants exhibit sensitivity to oxidative stress and reduced lifespan.
Conclusions:
- SKN-1 connects the developmental role in digestive system formation with essential detoxification functions against oxidative and xenobiotic stress.
- The oxidative stress response mediated by SKN-1 is ancient and conserved, suggesting its detoxification role predates its mesendodermal specification function.
- SKN-1 represents a critical link between early development and fundamental stress resistance mechanisms in C. elegans.
