The intracellular visualization of exogenous DNA in fluorescence microscopy

Area of Science:

• Biotechnology
• Molecular Biology
• Cell Biology

Background:

• Reliable localization and quantification of transfected DNA are essential for non-viral gene delivery vector development.
• Current DNA tracking methods include fluorescently labeled DNA, DNA-binding proteins fused to fluorescent proteins, and fluorescence in situ hybridization (FISH).
• Co-stainings are frequently employed to assess DNA colocalization within specific cellular compartments like endolysosomes and the nucleus.

Purpose of the Study:

• To provide an overview of DNA tracking methods for non-viral gene delivery.
• To offer guidance on combining these methods and necessary co-stainings for accurate experimental conclusions.
• To highlight challenges and needs in detecting exogenous DNA localization within the nucleus.

Main Methods:

• Review of fluorescence microscopy techniques for DNA tracking.
• Discussion of DNA labeling strategies (fluorescent tags, protein fusions).
• Evaluation of fluorescence in situ hybridization (FISH) and co-staining protocols.

Main Results:

• An overview of current DNA tracking methodologies is presented.
• Recommendations for combining methods and co-stainings are provided.
• The critical need for improved tools for nuclear DNA detection is emphasized.

Conclusions:

• Effective DNA tracking is vital for advancing non-viral gene delivery.
• Existing methods require careful combination and complementary techniques for precise conclusions.
• A significant gap exists in tools for detecting faint nuclear DNA signals, impeding the development of efficient transfection systems.