Combinatorial Antibody Library Expression in Eukaryotic Cells
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Solution Overview
Problem
Current methods for identifying functional antibodies that regulate phenotypes of eukaryotic cells are cumbersome and inefficient, particularly in isolating antibodies that go beyond simple binding, such as those that modulate cellular responses or signaling activities.
Innovation Solution
The development of methods involving the expression of combinatorial antibody libraries in eukaryotic cells using lentiviral or retroviral vectors, allowing each cell to express no more than three different antibody species, followed by selection of cells with altered phenotypes to identify specific modulatory antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional screening methods are used to identify functional antibodies, then the process is simple and direct, but the efficiency is low and the process is cumbersome
Solution Approach 1:
The patent introduces reporter cells as an intermediary system between the antibody library and the target cells. These reporter cells express signaling receptors and provide a readable output (reporter signal) that indicates antibody activity, thereby mediating the identification process and improving efficiency without excessive complexity
Solution Approach 2:
The patent replaces traditional mechanical/manual screening methods with a biological signaling system. Instead of manually testing each antibody, the system uses cellular signaling pathways that automatically indicate functional antibodies through reporter signals, substituting mechanical screening with a self-reporting biological system
2Measurement precision
If combinatorial antibody libraries are expressed in eukaryotic cells, then functional modulators can be identified, but the process becomes cumbersome and less efficient
Solution Approach 1:
The patent applies local quality by creating a specialized reporter cell line with specific properties (expressing signaling receptors and reporter genes) that is locally optimized for detecting antibody function. This localized functional assay system enables precise identification without requiring complex global changes to the entire experimental setup
Solution Approach 2:
The reporter cells serve as an intermediary that translates complex antibody-functional interactions into simple, readable signals. This intermediary system bridges the gap between the complex combinatorial library and the simple identification goal, enabling precise measurement without proportional complexity
3Adaptability or versatility
If simple binding antibodies are screened, then the process is straightforward, but antibodies with modulatory functions beyond binding are difficult to isolate
Solution Approach 1:
The patent implements feedback by using reporter signals that provide real-time information about antibody modulatory activity. The reporter cells respond to antibody binding and signaling events with measurable outputs, creating a feedback loop that enables detection and measurement of functional modulators beyond simple binding
Solution Approach 2:
The signaling receptors expressed in reporter cells act as intermediaries that translate antibody modulatory actions into detectable signals. This intermediary layer enables the detection of complex functional activities (such as pathway activation or inhibition) that would be difficult to measure directly
Data Source
AI summary
The invention provides methods for identifying protein modulators (e.g., antibody agonists) of eukaryotic cells. The methods typically involve expressing a combinatorial agent library (e.g., via lentiviral vectors) inside a eukaryotic cell type (e.g., a mammalian cell) and then directly selecting for agents (e.g., antibodies) that are agonist of a target molecule (e.g., a signaling receptor) that modulates a phenotype of or elicits a cellular response in the cell. Some related methods involve co-culturing a cell expressing a combinatorial agent library and a second cell, and then selecting agents that modulate a phenotype of or elicit a cellular response in the second cell. Preferably, the agents are antibodies and are introduced into and expressed in the starting cells under conditions each individual cell expresses no more than 3 different members of the antibody library. In addition, the invention provides methods for identifying protein agonists that capable of reprograming or trans-differentiating a target cell. Also provided in the invention are specific agonist antibodies of signaling receptors or biomolecules that modulate a phenotype or effectuate a cellular response in a eukaryotic cell (e.g., agonist antibodies of EpoR, TpoR or G-CSFR). Further provided in the invention are methods for selecting from combinatorial antibody libraries bispecific antibodies that can regulate cell phenotypes.