Genome-scale requirements for dynein-based transport revealed by a high-content arrayed CRISPR screen

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Dynein, a crucial microtubule motor, is vital for cellular organization.
• The mechanisms governing dynein's biosynthesis, assembly, and functional diversity remain largely uncharacterized.

Purpose of the Study:

• To identify novel regulators of dynein function and cellular organization.
• To investigate the orchestration of dynein's diverse cellular roles.

Main Methods:

• An arrayed CRISPR loss-of-function screen was performed in human cells.
• Dynein-tethered peroxisomes and early endosomes served as phenotypic readouts.
• High-content imaging and phenotypic fingerprint clustering were employed to analyze results.

Main Results:

• 195 validated hits were identified from a genome-wide gRNA library.
• Hits were categorized based on their impact on multiple or subset of dynein cargoes.
• The RNA-binding protein SUGP1 was identified as a novel regulator, sustaining LIS1 expression and promoting cargo trafficking.

Conclusions:

• The study identified novel proteins involved in dynein regulation and cellular transport.
• SUGP1's role in maintaining LIS1 expression highlights a new mechanism for dynein activation.
• The findings provide a foundation for future research into microtubule-based transport and cellular organization.