Related Experiment Video
Updated: Aug 11, 2026
Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
Published on: September 28, 2012
PML nuclear bodies: dynamic sensors of DNA damage and cellular stress
Graham Dellaire1, David P Bazett-Jones
1Programme in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada.
Abstract:
Promyelocytic leukaemia nuclear bodies (PML NBs) are generally present in all mammalian cells, and their integrity correlates with normal differentiation of promyelocytes. Mice that lack PML NBs have impaired immune function, exhibit chromosome instability and are sensitive to carcinogens. Although their direct role in nuclear activity is unclear, PML NBs are implicated in the regulation of transcription, apoptosis, tumour suppression and the anti-viral response. An emerging view is that they represent sites where multi-subunit complexes form and where post-translational modification of regulatory factors, such as p53, occurs in response to cellular stress. Following DNA damage, several repair factors transit through PML NBs in a temporally regulated manner implicating these bodies in DNA repair. We propose that PML NBs are dynamic sensors of cellular stress, which rapidly disassemble following DNA damage into large supramolecular complexes, dispersing associated repair factors to sites of damage. The dramatically increased total surface area available would enhance interactions between PML-associated factors regulating DNA repair and apoptosis.
Insights
Promyelocytic leukaemia nuclear bodies (PML NBs) are dynamic sensors of cellular stress. Upon DNA damage, they disassemble, dispersing repair factors to enhance DNA repair and apoptosis regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- Promyelocytic leukaemia nuclear bodies (PML NBs) are nuclear structures found in mammalian cells.
- PML NB integrity is crucial for cell differentiation, immune function, and genomic stability.
- PML NBs are implicated in transcription, apoptosis, tumor suppression, and antiviral responses.
Purpose of the Study:
- To investigate the role of PML NBs in cellular stress response, particularly following DNA damage.
- To elucidate the dynamic behavior of PML NBs and their associated factors during DNA repair.
- To understand how PML NBs contribute to the regulation of DNA repair and apoptosis.
Main Methods:
- Observational studies on PML NB dynamics in response to cellular stress.
- Analysis of factor translocation and complex formation within PML NBs.
- Investigating the impact of PML NB disassembly on DNA repair and apoptosis pathways.
Main Results:
- PML NBs act as dynamic sensors of cellular stress.
- Following DNA damage, PML NBs rapidly disassemble into large supramolecular complexes.
- Disassembly disperses associated repair factors to sites of damage, enhancing interactions for DNA repair and apoptosis regulation.
Conclusions:
- PML NBs are crucial dynamic hubs for sensing cellular stress and coordinating DNA repair.
- The disassembly of PML NBs is a key mechanism for efficient DNA damage response.
- These findings highlight PML NBs as critical regulators of genomic integrity and cell fate.
Related Concept Videos
01:23Negative Regulator Molecules
01:08Nucleotide Excision Repair
02:36DNA Damage can Stall the Cell Cycle
02:23Abnormal Proliferation
01:38Nucleotide Excision Repair
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
02:36DNA Damage Can Stall the Cell Cycle