Novel cyanine dye-labeled dideoxynucleoside triphosphates for DNA sequencing

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Dye-labeled terminators are crucial for automated DNA sequencing.
• Optimizing dye and linker chemistry is essential for improving sequencing accuracy and read length.
• Cyanine dyes offer distinct spectral properties suitable for multiplexing and detection.

Purpose of the Study:

• To synthesize and evaluate novel single-color cyanine dye-labeled dideoxynucleoside-5 riphosphates (terminators) with varying spacer lengths.
• To assess the efficacy of these terminators in DNA sequencing using a modified thermally stable DNA polymerase.
• To compare the performance of cyanine dye terminators with existing dye-primer sequencing methods.

Main Methods:

• Synthesis of Cy 5.0 and Cy 5.5 labeled dideoxynucleoside-5 riphosphates with specific linker lengths (10-atom for purines, 17-atom for pyrimidines).
• Formulation of terminators into two separate sequencing mixes (Cy 5.0 and Cy 5.5).
• Evaluation of terminator performance on different automated sequencing platforms using cycle sequencing.

Main Results:

• The synthesized cyanine dye-labeled terminators demonstrated effective incorporation by a modified DNA polymerase.
• Sequencing mixes containing Cy 5.0 and Cy 5.5 terminators produced improved band patterns.
• Band uniformity achieved with these terminators was comparable to established dye-primer sequencing methods.

Conclusions:

• Single-color cyanine dye-labeled terminators with optimized linker lengths are effective for DNA sequencing.
• These terminators offer an alternative to dye-primer methods, providing similar or improved sequencing performance.
• Further development of dye-terminator chemistry holds promise for advancing DNA sequencing technologies.