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PhotoFiTT: a quantitative framework for assessing phototoxicity in live-cell microscopy experiments
Mario Del Rosario1,2, Estibaliz Gómez-de-Mariscal1,2,3, Leonor Morgado1,2,3,4
1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal.
Nature Communications
|December 13, 2025
Summary
Phototoxicity in live-cell microscopy compromises experiments. A new framework, PhotoFiTT (Phototoxicity Fitness Time Trial), quantifies light-induced cellular stress, enabling optimized imaging protocols for better sample health and data quality.
Area of Science:
- Cell biology
- Microscopy
- Biophysics
Background:
- Phototoxicity is a significant challenge in live-cell fluorescence microscopy, limiting experimental duration and data accuracy.
- Quantitative assessment of light-induced cellular stress is crucial for reliable experimental outcomes.
- Existing methods for quantifying phototoxicity are limited, hindering protocol optimization.
Purpose of the Study:
- To develop and validate an integrated framework, PhotoFiTT (Phototoxicity Fitness Time Trial), for quantifying phototoxicity in live-cell imaging.
- To establish quantitative benchmarks for acceptable light-induced cellular stress.
- To enable optimization of microscopy imaging protocols to balance image quality with cellular health.
Main Methods:
- Development of a standardized experimental protocol for controlled light exposure.
- Application of advanced, label-free image analysis leveraging machine learning.
- Analysis of cell cycle dynamics, including mitotic timing, cell size, and cellular activity.
Main Results:
- PhotoFiTT effectively quantifies light-induced cellular stress in label-free settings.
- Demonstrated wavelength- and dose-dependent phototoxic effects in mammalian cells.
- Near-UV light induced significant mitotic delays at low doses (0.6 J/cm²), while longer wavelengths required higher doses.
Conclusions:
- PhotoFiTT provides a robust method for quantifying phototoxicity in live-cell microscopy.
- The framework allows researchers to determine safe light exposure limits.
- Optimized imaging protocols using PhotoFiTT can improve experimental reliability and maintain cellular health.
