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Exploratory and confirmatory gene expression profiling of mac1Delta
Jeane Maria De Freitas1, Jeung Hyoun Kim, Helen Poynton
1Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, USA.
The Journal of Biological Chemistry
|October 10, 2003
Summary
Removing Mac1p in Saccharomyces cerevisiae induced the iron regulon, revealing new Aft1p/Aft2p targets and metabolic shifts. This study identifies key genes involved in copper and iron homeostasis.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Cellular Metabolism
Background:
- Mac1p is a transcription factor regulating copper homeostasis in Saccharomyces cerevisiae.
- Iron and copper metabolism are interconnected and crucial for cellular function.
Purpose of the Study:
- To investigate the impact of Mac1p deletion on gene expression, particularly the iron regulon.
- To identify novel genes regulated by Aft1p/Aft2p and their roles in metal homeostasis.
Main Methods:
- Gene expression profiling using exploratory outlier identification and confirmatory studies.
- Bioinformatic analysis to identify transcription factor binding motifs (Aft1p/Aft2p).
- Phenotypic characterization of null mutants for differentially expressed genes.
Main Results:
- Deletion of Mac1p led to the induction of the iron regulon.
- The Aft1p/Aft2p binding motif was significantly associated with differential gene expression.
- Multiple genes encoding Fe-S cluster proteins were downregulated, suggesting iron conservation strategies.
- New potential Aft1p/Aft2p targets were identified.
- Several gene products (AKR1, MRS4, PCA1, SSU1, TIS11, YBR047W, YHL035C, YHR045W, YLR047C, YLR126C, YTP1) showed roles in copper or iron homeostasis.
Conclusions:
- Mac1p plays a role in regulating iron metabolism in Saccharomyces cerevisiae.
- Aft1p/Aft2p are key regulators of the iron response, with newly identified targets.
- Metabolic reorganization occurs to conserve iron upon Mac1p deletion.
- This study provides evidence for the involvement of specific gene products in maintaining copper and iron balance.