Hydrophobically modified polyacrylamide block copolymers for fast, high-resolution DNA sequencing in microfluidic...

Area of Science:

• Biotechnology
• Genomics
• Analytical Chemistry

Background:

• Current capillary array electrophoresis for DNA sequencing is time-consuming and costly.
• Previous work demonstrated improved double-stranded DNA (dsDNA) separation using cross-linked, hydrophobically modified polyacrylamide matrices.
• Linear polyacrylamide (LPA) is a common matrix material for DNA electrophoresis.

Purpose of the Study:

• To develop novel linear polyacrylamide-co-dihexylacrylamide block copolymers for enhanced single-stranded DNA (ssDNA) sequencing.
• To improve DNA sequencing speed and efficiency on microfluidic devices.
• To investigate the impact of hydrophobic monomer incorporation on DNA separation and matrix properties.

Main Methods:

• Synthesis of linear polyacrylamide-co-dihexylacrylamide block copolymers with varying amounts of N,N-dihexylacrylamide.
• Electrophoretic separation of ssDNA using the synthesized copolymer solutions on a microfluidic platform.
• Comparison of DNA sequencing read lengths and polymer solution viscosities against traditional LPA solutions.

Main Results:

• Copolymer solutions demonstrated up to a 10% increase in average DNA sequencing read length compared to LPA homopolymers.
• Incorporation of small amounts of hydrophobic monomer did not significantly increase solution viscosity.
• Rapid loading and unloading of the microfluidic channels were maintained.

Conclusions:

• The developed LPA-co-dihexylacrylamide block copolymers enhance ssDNA sequencing performance on microfluidic devices.
• These novel matrices offer improved read lengths without compromising matrix viscosity or channel throughput.
• The findings pave the way for faster and more affordable genomic information acquisition.