Codon-Mutant Library Generation Using Triplet-Randomized Oligonucleotides
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Solution Overview
Problem
Current methods for generating mutant libraries introduce mutations at the nucleotide level, leading to inefficient codon mutations across the full length of a gene, with a high rate of insertions and deletions, rendering them ineffective for more than a few positions, and existing techniques for codon-level mutagenesis are limited in controlling the mutation rate and introducing mutations uniformly.
Innovation Solution
The use of wild-type and triplet-randomized oligonucleotides to introduce codon-mutations uniformly across a target nucleic acid molecule, with a controlled rate of mutations, by amplifying a reference nucleic acid template with mutagenic oligonucleotides that randomize one to three codons, thereby maintaining a balanced distribution of mutations and minimizing insertions or deletions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nucleotide-level mutagenesis (error-prone PCR or chemical mutagenesis) is used to mutate genes across their entire length, then mutations are introduced at the nucleotide level, but only mutant codons that differ from the wild-type codon by a single-nucleotide are introduced at an appreciable rate, and the mutation rate cannot be controlled at the codon level
Solution Approach 1:
The patent segments the mutagenesis process into codon-level operations by using triplet-randomized oligonucleotides that target specific codon positions. Each oligonucleotide is designed to randomize exactly one codon (three nucleotides) at a time, allowing precise control over which codons are mutated while maintaining the ability to introduce all 64 possible codons at each position.
Solution Approach 2:
The patent transitions from nucleotide-level mutagenesis (one dimension) to codon-level mutagenesis (another dimension) by using oligonucleotides that span three nucleotides. This dimensional shift enables simultaneous control of all three nucleotides in a codon, allowing introduction of any of the 64 codons at each position while maintaining uniform distribution across the gene length.
2Adaptability or versatility
If triplet-randomized oligonucleotides (NNN) are used to randomize codons at pre-selected sites, then all 64 codons appear in the library at that site, but insertions and deletions accumulate rapidly as the number of mutated sites increases, rendering the method ineffective for more than a few positions
Solution Approach 1:
The patent applies local quality by using oligonucleotides of specific lengths (9-50 nucleotides) that randomize a controlled number of codons (one to three) at each binding site. This localized approach ensures that each oligonucleotide introduces a manageable number of codon mutations, preventing the rapid accumulation of insertions and deletions that occurs when too many sites are mutated simultaneously.
Solution Approach 2:
The patent changes the parameters of the mutagenesis process by controlling the oligonucleotide length (9-50 nucleotides) and the number of codons randomized per oligonucleotide (one to three). These parameter adjustments allow optimization of the mutation rate to achieve uniform codon mutations across the full length of the gene while maintaining protein functionality.
3Productivity
If multiple codons are randomized at each oligonucleotide binding site, then more mutations are introduced per site, but the rate of insertions and deletions increases, inactivating the protein
Solution Approach 1:
The patent applies partial action by using oligonucleotides that randomize one to three codons per binding site, rather than attempting to randomize all possible codons at every position. This partial approach introduces a controlled number of mutations that achieves sufficient diversity while avoiding the excessive mutation load that would inactivate the protein.
Data Source
AI summary
The present disclosure relates to compositions and methods for randomly introducing codon-mutations in a target nucleic acid molecule and, more particularly, using wild-type and triplet-randomized oligonucleotides to introduce mutations uniformly across a target nucleotide of interest in a controlled fashion and with a low rate of insertions or deletions.