Purification of multiplex oligonucleotide libraries by synthesis and selection.

Area of Science:

• Molecular Biology
• Synthetic Biology
• Biotechnology

Background:

• Complex oligonucleotide libraries are crucial for synthetic biology, pharmaceuticals, nanotechnology, and DNA data storage.
• High error rates during oligonucleotide synthesis increase costs and labor.
• Common errors include insertions and deletions, complicating library applications.

Purpose of the Study:

• To develop a single-base resolution, length-based purification method for complex oligonucleotide libraries.
• To enhance the purity of oligonucleotide libraries synthesized with varying error rates.
• To provide a versatile purification strategy applicable to both identical and different length oligonucleotides.

Main Methods:

• Developed a length-based purification method named "purification of multiplex oligonucleotide libraries by synthesis and selection" (PULSAR).
• The method allows for single-base resolution and can be performed manually or with next-generation sequencing.
• Applied the method to digital data-encoded libraries and libraries encoding complementarity-determining region H3.

Main Results:

• Increased the purity of full-length oligonucleotides in identical-length libraries from 83% to 97%.
• Simultaneously purified libraries with three different lengths, increasing the in-frame oligo fraction from 49.6% to 83.5%.
• Demonstrated the method's effectiveness on a library with empirically achieved diversity greater than 10^6.

Conclusions:

• The developed length-based purification method effectively reduces errors in complex oligonucleotide libraries.
• This purification strategy enhances the utility and reduces the cost of applications relying on synthesized oligonucleotide libraries.
• The method offers a scalable and efficient solution for purifying diverse oligonucleotide libraries.