Whole-genome screen identifies diverse pathways that negatively regulate ciliogenesis

Area of Science:

• Cell Biology
• Cancer Research
• Biochemistry

Background:

• Ciliogenesis, the formation of cellular cilia, is crucial for normal cell function and is often dysregulated in cancer.
• Integrin signaling and extracellular matrix (ECM) interactions play vital roles in cell adhesion, migration, and growth.
• The interplay between cell adhesion and ciliogenesis remains incompletely understood.

Purpose of the Study:

• To identify novel regulators of ciliogenesis using a high-throughput RNA interference (RNAi) screen.
• To elucidate the connection between integrin signaling, ECM adhesion, and ciliary assembly in normal and breast cancer cells.

Main Methods:

• Conducted a whole-genome RNAi screen in normal and basal breast cancer cells.
• Characterized the function of identified ciliation inhibitory genes.
• Utilized integrin ligand (vitronectin) treatment and YAP/TAZ pathway modulation.

Main Results:

• Uncovered an extensive gene network linking integrin signaling and ECM adhesion to ciliogenesis inhibition.
• Demonstrated that silencing ECM genes induces ciliation, which restricts cell growth and migration.
• Showed that vitronectin rescues enhanced ciliation and YAP/TAZ pathway activation suppresses aberrant ciliation.

Conclusions:

• Established a reciprocal relationship between ciliation and cellular adhesion to the ECM.
• Provided a resource for understanding "outside-in" and "inside-out" signaling in cilium assembly control.
• Highlighted potential therapeutic targets for breast cancer by modulating ciliogenesis and cell adhesion.