AID-Mediated SHM for Antibody Library Generation
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Solution Overview
Problem
Current methods for developing recombinant proteins, particularly monoclonal antibodies, face inefficiencies in rapidly generating antibodies with improved pharmacokinetics, cross-reactivity, and safety profiles due to limitations in systematically searching sequence space and detecting rare improvements, especially with high throughput screening methodologies being limited by redundant codon usage and the massive number of possible mutants.
Innovation Solution
The generation of focused polynucleotide libraries, including synthetic and semi-synthetic seed libraries, optimized for somatic hypermutation (SHM) to create novel mutants of recombinant proteins, allowing for the systematic analysis and selection of antibodies with desired properties by modifying nucleic acid sequences to act as substrates for AID-mediated SHM, thereby enhancing mutagenesis efficiency and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high throughput screening methodologies are used to generate and screen mutants, then the quantity of mutants screened increases, but the efficiency of identifying rare improvements decreases due to redundant codon usage and the massive number of possible mutants
Solution Approach 1:
The patent applies local quality by optimizing specific codon positions within the gene sequence to be more susceptible to somatic hypermutation. By modifying particular codons (e.g., using codons with cytosine at the second position) rather than treating the entire sequence uniformly, the method creates focal points for mutation that increase the likelihood of generating beneficial variants without requiring screening of all possible mutants.
Solution Approach 2:
The patent changes the nucleotide sequence parameters by introducing specific codon compositions that are known to be hotspots for AID-mediated somatic hypermutation. This involves substituting codons with specific nucleotide patterns (particularly those containing cytosine) to increase mutation susceptibility at targeted positions, thereby altering the mutation landscape to favor productive variants.
2Reliability
If the entire sequence space is systematically searched to find improved antibodies, then the completeness of analysis increases, but the time and resources required increase exponentially
Solution Approach 1:
The patent applies preliminary action by pre-modifying the codon sequence before mutation and screening to create a focused library with enhanced mutation potential. By preparing the sequence in advance with optimized codon composition and introducing targeted mutations, the method reduces the need for exhaustive screening of all possible sequence variations, thereby saving time while maintaining reliability.
Solution Approach 2:
The patent segments the gene sequence into regions with different codon optimization strategies, focusing mutagenesis on specific domains or CDR regions that are most critical for antigen binding. This segmentation allows systematic analysis of key functional regions without requiring exhaustive screening of the entire protein sequence.
3Adaptability or versatility
If redundant codon usage is maintained in the library, then the natural genetic diversity is preserved, but the efficiency of high throughput screening decreases
Solution Approach 1:
The patent applies local quality by differentiating between regions where codon redundancy should be maintained (to preserve genetic diversity and robustness) and regions where codons should be optimized for mutation susceptibility (to improve screening efficiency). This localized approach allows simultaneous achievement of both diversity preservation and screening enhancement.
Solution Approach 2:
The patent changes codon usage parameters selectively, replacing redundant codons with mutation-prone codons in specific positions while maintaining appropriate codon diversity in other regions. This parameter optimization creates a balanced library that maintains adaptability while improving screening productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the rapid development of antibodies with improved pharmacokinetics and safety profiles by systematically exploring sequence space, increasing the efficiency of identifying rare improvements and optimizing antibody properties through targeted mutagenesis, thereby overcoming the limitations of existing high throughput screening methodologies.
Implementation Method 1
modified to act as a substrate for AID mediated SHM
Data Source
AI summary
This invention relates to methods for the generation of humanized antibodies, particularly a humanized antibody heavy chain protein and a humanized antibody light chain protein. The method comprises using cells that express or can be induced to express Activation Induced Cytidine Deaminase (AID).