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Fluorescence lifetime imaging for studying DNA compaction and gene activities
Svitlana M Levchenko1,2, Artem Pliss3, Xiao Peng1
1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China.
Light, Science & Applications
|November 3, 2021
Summary
Fluorescence lifetime imaging (FLIM) offers new insights into DNA structure. This technique reveals gene-rich DNA is loosely compacted compared to gene-poor DNA, advancing genomic studies.
Area of Science:
- Molecular Biology
- Genomics
- Biophysics
Background:
- Optical imaging is crucial for studying cellular genome structure and function.
- Analyzing complex, compacted DNA remains a significant challenge for current microscopy techniques.
Purpose of the Study:
- To introduce fluorescence lifetime imaging (FLIM) as an advanced method for studying genomic structure.
- To investigate DNA compaction, replication, and gene expression using FLIM.
- To differentiate DNA compaction levels in gene-rich versus gene-poor genomic regions.
Main Methods:
- Developed a FLIM assay utilizing two independent DNA compaction sensing mechanisms.
- Mechanism 1: Exploited the relationship between fluorescence probe lifetime and local refractive index, affected by DNA compaction density.
- Mechanism 2: Employed Förster resonance energy transfer (FRET) between DNA-incorporated donor and acceptor fluorophores.
Main Results:
- Validated both FLIM mechanisms in cultured cells.
- Observed distinct differences in DNA compaction between gene-rich and gene-poor genomic pools.
- Demonstrated that gene-rich DNA exhibits looser compaction than dense, gene-poor DNA domains.
Conclusions:
- FLIM is a powerful tool for analyzing genomic structure and DNA compaction.
- The study provides evidence of differential DNA compaction correlating with gene density.
- Findings contribute to understanding genome organization and gene regulation.
