Streamlined human antibody generation and optimization by exploiting designed immunoglobulin loci in a B cell line

• Published in: Cellular & molecular immunology Vol. 18; no. 6; pp. 1545 - 1561
• Main Authors: Seo, Hidetaka, Masuda, Hitomi, Asagoshi, Kenjiro, Uchiki, Tomoaki, Kawata, Shigehisa, Sasaki, Goh, Yabuki, Takashi, Miyai, Shunsuke, Takahashi, Naoki, Hashimoto, Shu-ichi, Sawada, Atsushi, Takaiwa, Aki, Koyama, Chika, Tamai, Kanako, Kurosawa, Kohei, Lin, Ke-Yi, Ohta, Kunihiro, Nakazaki, Yukoh
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.06.2021; Nature Publishing Group
• Subjects: 631/154; 631/250; 631/80; Amino Acid Sequence; Animals; Antibodies; Antibodies - chemistry; Antibodies - genetics; Antibodies - metabolism; Antibodies, Monoclonal - immunology; Antibodies, Neutralizing - metabolism; Antibody Formation - drug effects; Antigens; Autoimmune diseases; B-Lymphocytes - drug effects; B-Lymphocytes - metabolism; Base Sequence; Biomedical and Life Sciences; Biomedicine; Cell Line; Chickens; Directed evolution; Gene Conversion - drug effects; Gene Dosage; Genetic Variation; Humans; Hydroxamic Acids - pharmacology; Immunoglobulins; Immunology; Infectious diseases; Libraries; Medical Microbiology; Microbiology; Monoclonal antibodies; Optimization; Pseudogenes; Tumor Necrosis Factor-alpha - metabolism; Vaccine; Vascular Endothelial Growth Factor A - metabolism; antibody therapeutics; antibody engineering; Immunoglobulin rearrangements; homologous recombination; drug discovery
• ISSN: 1672-7681; 2042-0226
• DOI: 10.1038/s41423-020-0440-9

Monoclonal antibodies (mAbs) are widely utilized as therapeutic drugs for various diseases, such as cancer, autoimmune diseases, and infectious diseases. Using the avian-derived B cell line DT40, we previously developed an antibody display technology, namely, the ADLib system, which rapidly generates antigen-specific mAbs. Here, we report the development of a human version of the ADLib system and showcase the streamlined generation and optimization of functional human mAbs. Tailored libraries were first constructed by replacing endogenous immunoglobulin genes with designed human counterparts. From these libraries, clones producing full-length human IgGs against distinct antigens can be isolated, as exemplified by the selection of antagonistic mAbs. Taking advantage of avian biology, effective affinity maturation was achieved in a straightforward manner by seamless diversification of the parental clones into secondary libraries followed by single-cell sorting, quickly affording mAbs with improved affinities and functionalities. Collectively, we demonstrate that the human ADLib system could serve as an integrative platform with unique diversity for rapid de novo generation and optimization of therapeutic or diagnostic antibody leads. Furthermore, our results suggest that libraries can be constructed by introducing exogenous genes into DT40 cells, indicating that the ADLib system has the potential to be applied for the rapid and effective directed evolution and optimization of proteins in various fields beyond biomedicine.