Dissecting phenotypic responses of the druggable targetome in cancers

Area of Science:

• Cancer Biology
• Genomics
• Drug Discovery

Background:

• Existing cancer cell line screening data are limited by assay variability, hindering integrated analysis.
• Understanding the phenotypic outcomes of targeting druggable genes is crucial for cancer therapy development.

Purpose of the Study:

• To systematically analyze the anticancer effects of targeting the druggable human targetome.
• To investigate how different assay conditions (2D vs. 3D) and readouts affect observed gene functions.
• To correlate gene functions with microenvironmental differences and understand phenotypic plasticity.

Main Methods:

• Screened a library of siRNAs targeting approximately 4,800 druggable genes in cancer cell lines.
• Utilized both 2D monolayer and 3D sphere formation assay conditions.
• Simultaneously measured cell proliferation and viability as phenotypic readouts.

Main Results:

• Hit rates and observed gene effects significantly varied based on assay conditions and readouts.
• Functional gene classes showed distinct correlations with the 2D and 3D microenvironments.
• Gene knockdown targeting proliferation often increased surviving cell viability and self-renewal potential.

Conclusions:

• Parallel 2D/3D assays and multiplexed readouts provide deeper functional insights into the cancer targetome.
• The study highlights the importance of considering assay context when interpreting gene function in cancer.
• Findings offer a framework for understanding complex phenotypic responses to gene modulation in cancer.