Related Experiment Video
Updated: Jun 16, 2026
09:18
Photobleaching Assays (FRAP & FLIP) to Measure Chromatin Protein Dynamics in Living Embryonic Stem Cells
Published on: June 29, 2011
Conditions for using FRAP as a quantitative technique--influence of the bleaching protocol
Dominika O Trembecka1, Mateusz Kuzak, Jurek W Dobrucki
1Faculty of Biochemistry, Biophysics and Biotechnology, Division of Cell Biophysics, Jagiellonian University, Kraków, Poland.
Summary
Fluorescence recovery after photobleaching (FRAP) protocols significantly impact measured protein dynamics in live cells. Standardizing FRAP methods is crucial for reliable comparisons of nuclear protein mobility across studies.
Area of Science:
- Cell biology
- Biophysics
- Molecular dynamics
Background:
- Fluorescence recovery after photobleaching (FRAP) is a key technique for assessing dynamic behavior of fluorescently-tagged proteins in live cells.
- Variability in FRAP protocols and data analysis methods across different laboratories complicates the interpretation of nuclear protein dynamics.
Purpose of the Study:
- To investigate whether experimental FRAP protocols influence fluorescence half-recovery times.
- To assess the impact of bleaching parameters on the measured dynamics of nuclear proteins.
Main Methods:
- Utilized diverse FRAP protocols to study the dynamics of GFP-tagged H1 histone in live cells.
- Analyzed published FRAP data to identify variations in experimental procedures and data analysis.
Main Results:
- Demonstrated that fluorescence half-recovery times are dependent on the specific FRAP bleaching protocol employed.
- Photon flux of the bleaching light was identified as a critical factor influencing recovery times.
Conclusions:
- Inconsistent FRAP protocols and data analysis hinder direct comparisons of nuclear protein mobility data between laboratories.
- Establishing standardized FRAP protocols and consistent data analysis is essential for leveraging FRAP as a quantitative technique.
