Centriolar satellites assemble via a hierarchical pathway driven by PCM1 multimerization.

Area of Science:

• Cell Biology
• Molecular Biology
• Organelle Biology

Background:

• Centriolar satellites (CS) are vital membraneless organelles implicated in various cellular functions and diseases.
• The molecular mechanisms governing CS assembly and regulation are not well understood.

Purpose of the Study:

• To elucidate the molecular principles of centriolar satellite biogenesis and regulation.
• To develop novel assays for quantifying CS properties during their lifecycle.

Main Methods:

• Development of cellular and in vitro biogenesis assays for spatiotemporal quantification of CS.
• High-resolution imaging to analyze the subdomains and dynamics of PCM1 and its clients.
• Investigation of the role of pericentriolar material-1 (PCM1) scaffold formation and multimerization.

Main Results:

• CS assembly follows a hierarchical pathway initiated by PCM1 scaffold formation and subsequent client recruitment.
• PCM1 intrinsically forms granules via multimerization, a process influenced by the cytoskeleton.
• Disruption of PCM1 multimerization negatively impacts ciliary signaling and mitotic progression.

Conclusions:

• This study defines the molecular basis of centriolar satellite biogenesis, providing essential tools for further research.
• The findings offer a framework for understanding how CS dysfunction contributes to developmental and neuronal diseases.
• The principles of CS assembly may be applicable to other membraneless organelles, explaining their specificity and plasticity.