Labeling DNA for single-molecule experiments: methods of labeling internal specific sequences on double-stranded DNA

Area of Science:

• Molecular Biology
• Biophysics
• Biochemistry

Background:

• Single-molecule experiments require precise labeling of DNA molecules.
• Selecting an appropriate DNA labeling method is crucial for experimental success.
• Existing methods may require specialized training or reagents, limiting accessibility.

Purpose of the Study:

• To provide a practical guide for labeling internal sequences on double-stranded DNA molecules.
• To review six distinct labeling approaches for single-molecule experiments.
• To assist experimentalists in selecting suitable labeling methods based on their constraints.

Main Methods:

• Review and description of six DNA labeling techniques.
• Evaluation of each method's labeling yield and cofactor compatibility (e.g., Mg2+).
• Assessment of training and reagent requirements for each approach.

Main Results:

• Detailed comparison of six labeling methods for double-stranded DNA.
• Identification of merits and drawbacks for each technique in a single-molecule context.
• Criteria provided for method selection based on experimental needs.

Conclusions:

• The review offers a simplified reference for choosing DNA labeling strategies.
• Selected methods prioritize simplicity, robustness, and suitability for non-biologists.
• The guide aims to enhance the utility of DNA labeling in diverse single-molecule experiments.