Epigenetic reprogramming induced by key metabolite depletion is an evolutionarily ancient path to tumorigenesis

Area of Science:

• Evolutionary biology
• Cancer research
• Metabolomics

Background:

• Tumorigenesis typically requires years and multiple mutations in humans.
• Tumors in short-lived species can form rapidly, questioning common pathways.
• Understanding conserved mechanisms of tumorigenesis is crucial.

Purpose of the Study:

• To investigate commonalities in tumorigenesis pathways across species.
• To identify key metabolic alterations driving tumor formation in a fly model.
• To explore the evolutionary origins of cancer development.

Main Methods:

• Utilized a Drosophila melanogaster tumor model induced by loss of cell polarity genes.
• Analyzed systemic metabolic changes, including acetyl-CoA and methionine cycles.
• Conducted comparative studies of fly and human tumors with similar metabolic signatures.

Main Results:

• Identified systemic depletion of acetyl-CoA, reducing histone acetylation and gene silencing.
• Observed defects in the methionine cycle, depleting S-adenosyl methionine, reducing histone methylation, and activating transposons.
• Demonstrated that perturbing methionine metabolism inhibits tumor growth.
• Found human tumors with similar metabolic profiles exhibit lower mutational load, younger patient age, and reduced DNA methylation.

Conclusions:

• Metabolic alterations, specifically depletion of key metabolites, are evolutionarily ancient drivers of tumorigenesis.
• This metabolic reprogramming can lead to rapid tumor formation independent of extensive mutations.
• Findings suggest conserved metabolic vulnerabilities across species contribute to cancer development.