Abstract 5051: RenMab Mouse: A leading platform for fully human antibody generation

Abstract With the development of immune-oncology, therapeutic antibodies have been proven to be extraordinarily effective for cancer treatment. Conventional human antibody discovery process can be divided into steps including target selection, target validation, screening preparation, hits generation, leads selection, lead optimization, and clinical candidate selection. To accelerate antibody development process, Biocytogen has developed RenMab Mouse, a fully human antibody mouse whose entire variable regions were replaced by human Ig heavy chain and κ light chain through Biocytogen's unique Mb-scale chromosome engineering technology. RenMab Mouse provides a remarkably efficient therapeutic antibody discovery platform for fully human antibody generation, characterization, and rapid in vivo efficacy screening. We have characterized RenMab Mouse with the following features. 1. The entire mouse variable regions were replaced with complete human genome DNA in situ for complete human & mouse regulatory elements. The gene regulation of RenMab mouse is highly consistent with that of human. 2. Mouse constant region remains to ensure normal immune cell population, development and maturation. Immune system of RenMab Mouse has been proven to be almost identical to that of wild type mice. RenMab Mouse showed normal antibody immune responses to antigens. 3. RenMab Mouse generates a highly diverse repertoire of fully human antibody variable regions through V(D)J recombination. This capability can lead to improved hit rates in antibody drug discovery. In conclusion, RenMab Mouse, a fully human antibody mouse developed by Biocytogen's chromosome engineering technology, has been proven to exhibit normal immune cell profile and rapid immune response. Combined with existing inventory of single, double or triple target humanized mouse models and a world-leading proprietary gene editing platform, Biocytogen is dedicated to providing a one-stop solution for antibody discovery and development from target validation to IND application. Citation Format: Gary Ng, Huizhen Zhao, Yabo Zhang, Lili Liu, Hui Lu, Shuwen Huang, Yuelei Shen. RenMab Mouse: A leading platform for fully human antibody generation [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 5051.