Quantitative proteomics suggests metabolic reprogramming during ETHE1 deficiency.

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Mitochondrial sulfur dioxygenase (ETHE1) deficiency leads to ethylmalonic encephalopathy, a severe metabolic disorder.
• The condition is marked by early-onset encephalopathy and impaired cytochrome C oxidase activity due to hydrogen sulfide accumulation.
• The precise molecular mechanisms underlying ETHE1 deficiency remain incompletely understood.

Purpose of the Study:

• To elucidate the molecular effects of ETHE1 deficiency using a quantitative proteomics approach.
• To identify proteins and pathways affected by ETHE1 deficiency in liver tissue.
• To explore the link between ETHE1 deficiency, hydrogen sulfide accumulation, and cellular processes.

Main Methods:

• Quantitative proteomics analysis of liver tissue from ETHE1-deficient mice.
• Mass spectrometry (MS) data analysis to identify differentially expressed proteins.
• Bioinformatic analysis to assess pathway enrichment and functional impact.

Main Results:

• ETHE1 deficiency is linked to altered redox-active proteins, including downregulated dehydrogenases and cytochrome P450 members.
• Metabolic reprogramming observed through upregulation of glycolytic enzymes and altered heterogeneous ribonucleoproteins.
• Increased total protein acetylation suggests a connection between ETHE1, redox state, and cellular metabolites.

Conclusions:

• ETHE1 deficiency significantly impacts redox homeostasis, metabolic pathways, and gene expression regulation.
• The study highlights a novel link between ETHE1 and gene expression, potentially mediated by heterogeneous ribonucleoproteins.
• Findings provide insights into the complexity of ethylmalonic encephalopathy and the role of ETHE1 in cellular function.