Labeled nucleoside triphosphates with reversibly terminating aminoalkoxyl groups

Area of Science:

• Biochemistry
• Molecular Biology
• Genomics

Background:

• DNA sequencing methods require efficient methods for controlled nucleotide incorporation and chain termination.
• Existing sequencing technologies face challenges in achieving high throughput and accuracy.

Purpose of the Study:

• To develop and evaluate novel nucleoside triphosphates with a 3 ahydrogenONH₂ blocking group for DNA sequencing applications.
• To demonstrate the feasibility of iterative primer extension and cleavage cycles for continuous DNA synthesis.

Main Methods:

• Synthesis of nucleoside triphosphates with and without 3 ahydrogenONH₂ blocking groups and fluorescent tags.
• Identification of DNA polymerases capable of incorporating these modified nucleotides.
• Development of nitrite chemistry for mild cleavage of the 3 ahydrogenONH₂ blocking group.
• Demonstration of extension-cleavage-extension cycles in solution and on a sequencing platform.

Main Results:

• Successfully synthesized 3 ahydrogenONH₂-modified nucleoside triphosphates, with and without fluorescent labels.
• Identified DNA polymerases that incorporate these modified nucleotides, resulting in chain termination.
• Established mild nitrite-based chemistry for efficient cleavage of the 3 ahydrogenONH₂ group, enabling subsequent extension.
• Demonstrated successful multiple extension-cleavage-extension cycles in solution and on the Intelligent Bio-Systems Sequencer.

Conclusions:

• The 3 ahydrogenONH₂ blocking group is a viable tool for controlled DNA synthesis in sequencing.
• This method facilitates iterative cycles of nucleotide addition and chain extension, crucial for next-generation sequencing.
• The developed chemistry shows significant potential for improving the efficiency and capabilities of DNA sequencing platforms.