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How does phage display technology help scientists create human monoclonal antibodies?

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Diagram of an antibody molecule showing two identical light chains and two identical heavy chains joined by disulfide bonds in a Y-shaped structure, with labeled regions for antigen binding and effector function. — antibody The four-chain structure of an antibody, or immunoglobulin, molecule. The basic unit is composed of two identical light (L) chains and two identical heavy (H) chains, which are held together by disulfide bonds to form a flexible Y shape. Each chain is composed of a variable (V) region and a constant (C) region.

Phage display technology is a powerful method used to generate human monoclonal antibodies by engineering and expressing human antibody proteins on the surfaces of bacteriophage (phage) virion particles.2

In this process, researchers insert genetic material encoding human antibody fragments into the phage genome, typically into a gene that encodes a coat protein. As a result, the corresponding antibody protein is displayed on the exterior of the phage virion. This allows scientists to create large libraries of phages, each displaying a different antibody variant. By exposing these libraries to specific targets, researchers can select and purify the phages that bind most effectively to a desired antigen.12

This technique enables the development of fully human antibodies, which are less likely to trigger an immune response when administered to patients compared to those derived from other species. A notable success of this technology is adalimumab, the first fully human monoclonal antibody developed via phage display to be approved for clinical use.21