Yeast Phenomic Analysis Reveals DNA Repair, pH Homeostasis, and Ribosomal Biogenesis as Modulators of Anticancer...

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• The ruthenium complex KP1019 exhibits anticancer properties, inhibiting proliferation and causing tumor regression.
• Previous research indicates KP1019 induces DNA damage in cancer cells and yeast (Saccharomyces cerevisiae).

Purpose of the Study:

• To identify novel cellular targets and pathways modulating KP1019's effects using a yeast model.
• To elucidate the mechanisms underlying KP1019's anticancer activity and inform combination therapy development.

Main Methods:

• Quantitative high-throughput cell array phenotyping (Q-HTCP) screen of a yeast gene deletion library.
• Growth curve analysis to identify gene deletions interacting with KP1019.
• Assessed effects of KP1019 on ribosomal protein localization and synergy with everolimus.

Main Results:

• Drug-enhancing deletions were enriched in DNA repair pathways, confirming DNA damage as a target.
• pH homeostasis influenced KP1019's cellular effects.
• Drug-suppressing deletions implicated ribosomal proteins, with KP1019 causing ribosomal biogenesis stress.
• KP1019 demonstrated synergistic effects with the TOR pathway inhibitor everolimus.

Conclusions:

• KP1019 perturbs ribosome assembly, representing a key mechanism of its anticancer action.
• Findings support the development of combination therapies targeting ribosome biogenesis and related pathways.