MYC-an emerging player in mitochondrial diseases.

Area of Science:

• Cellular Metabolism
• Mitochondrial Biology
• Cancer Biology

Background:

• Mitochondria are central to cellular metabolism and biological processes.
• Mitochondrial diseases impair oxidative phosphorylation (OXPHOS), causing metabolic rewiring similar to cancer's Warburg effect.
• The transcription factor MYC (c-MYC) regulates metabolic pathways relevant to both cancer and mitochondrial diseases.

Purpose of the Study:

• To review MYC-regulated metabolic pathways.
• To examine MYC expression in mitochondrial diseases.
• To explore how OXPHOS deficiency may trigger MYC upregulation and its pathogenic implications.

Main Methods:

• Literature review of MYC-regulated metabolic pathways.
• Analysis of existing studies on MYC expression in mitochondrial disease models.
• Speculative analysis of MYC's role in OXPHOS deficiency.

Main Results:

• MYC regulates key metabolic pathways, including glycolysis, nucleotide biosynthesis, and glutamine utilization.
• Several mitochondrial disease models show MYC upregulation or associated transcriptional signatures.
• Mitochondrial integrated stress response (mt-ISR) overlaps with MYC overexpression effects.
• High MYC levels can promote replication stress, genomic instability, and apoptosis.
• OXPHOS-defective cells may be vulnerable to high MYC levels, impacting cell cycle progression and DNA damage.

Conclusions:

• MYC upregulation in mitochondrial diseases is a potential driver of pathogenesis.
• Understanding the interplay between OXPHOS, MYC, and cellular metabolism is crucial for disease insight.
• Further research is needed to elucidate the precise mechanisms and therapeutic potential.