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Published on: April 12, 2021
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Phase separation is required for PML nuclear body biogenesis and function
Wenyu Wu1,2, Yangxia Tan1,2, Hongxin Yin1,2
1Shanghai Institute of Hematology, National Research Center for Translational Medicine, State Key Laboratory of Medical Genomics, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Summary
PML nuclear bodies (NBs) form through liquid-liquid phase separation (LLPS), crucial for cellular regulation. Mutations impairing LLPS disrupt NB assembly and function, impacting leukemia treatment.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Oncology
Background:
- PML nuclear bodies (NBs) are essential for cellular functions and their malfunction is linked to acute leukemia.
- Arsenic treatment for acute promyelocytic leukemia (APL) relies on PML NB rescue, but the assembly mechanism remains unclear.
Purpose of the Study:
- To elucidate the mechanism of PML NB assembly.
- To investigate the role of liquid-liquid phase separation (LLPS) in PML NB formation.
- To analyze the impact of specific mutations on PML NB biogenesis and function.
Main Methods:
- Fluorescence recovery after photobleaching (FRAP) to assess LLPS dynamics.
- Transmission electron microscopy (TEM) to visualize NB structure.
- Analysis of PML mutations, including A216V and Leu to Pro variants.
Main Results:
- PML NB formation involves liquid-liquid phase separation (LLPS).
- The arsenic-resistant PML A216V mutation significantly impairs LLPS, altering NB structure and aggregation.
- Mutations in the PML coiled-coil domain differentially affect LLPS activity.
- Correct LLPS-driven NB formation is critical for partner recruitment, PTMs, and cellular processes like ROS control, mitochondria production, and apoptosis.
Conclusions:
- LLPS is a critical step in PML NB biogenesis.
- Impaired LLPS in PML NBs contributes to disease pathogenesis and affects therapeutic responses.
- Understanding LLPS in PML NB formation offers insights into leukemia treatment and cellular regulation.
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