Question

What is the advantage of using ddNTPs conjugated with fluorescent molecules in automated method of DNA sequencing?

Hint:

Fluorescent ddNTPs enable fast, safe, and precise automated DNA sequencing by allowing all bases to be detected simultaneously in one reaction.

Answer 1

The incorporation of ddNTPs modified with fluorescent markers into automated DNA sequencing protocols yields multiple benefits:

• Parallel Identification: The use of distinct fluorescent dyes for each ddNTP type permits the simultaneous identification of all four bases within a single reaction.
• Enhanced Throughput and Velocity: Automated sequencers identify fluorescence signals emitted as DNA fragments traverse a laser detection system, facilitating accelerated sequencing.
• Improved Precision: Fluorescence signatures provide unambiguous and accurate identification of the terminal nucleotide, thereby minimizing errors.
• Enhanced Safety and Ease of Use: This method obviates the requirement for radioactive labeling and manual gel electrophoresis interpretation.
• Automated Data Processing: Fluorescence data is amenable to software-driven analysis, enabling swift and precise base calling.