An integrated system for DNA sequencing by synthesis using novel nucleotide analogues

Area of Science:

• Genomics and Molecular Biology
• Biotechnology
• Bioinformatics

Background:

• The Human Genome Project's success necessitates advanced, high-throughput DNA sequencing technologies.
• Sanger sequencing's limitations, particularly electrophoretic separation, hinder cost-effective full-genome analysis.
• Personalized medicine and disease research require efficient methods for individual genome screening.

Purpose of the Study:

• To review innovations in DNA sequencing by synthesis (SBS) for cost reduction and increased throughput.
• To present the development of DNA-immobilized chips and novel nucleotide reporters for SBS.
• To highlight advancements in chip-based SBS for accurate and efficient DNA sequencing.

Main Methods:

• Utilized click chemistry for efficient surface immobilization of DNA onto chips.
• Developed first-generation (G-1) modified nucleotides with base-tethered, cleavable fluorophores and 3'-OH capping.
• Engineered second-generation (G-2) SBS using 3'-capped nucleotide reversible terminators (NRTs) and cleavable fluorescent dideoxynucleotides (ddNTPs).

Main Results:

• Demonstrated unambiguous DNA sequence identification using chip-based SBS with G-1 nucleotides.
• G-2 SBS system improved nucleotide incorporation fidelity by using reversible terminators and ddNTPs.
• Developed 3'-capped NRTs for unambiguous determination of homopolymeric regions, overcoming pyrosequencing limitations.

Conclusions:

• Integration of high-density DNA chips with advanced SBS approaches enables high-throughput, accurate DNA sequencing.
• These advancements are crucial for personalized medicine, disease gene discovery, and broader biological research.
• The developed SBS platform offers a promising solution for economically viable full-genome sequencing.