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Updated: Aug 16, 2026
Scalable High Throughput Selection From Phage-displayed Synthetic Antibody Libraries
Published on: January 17, 2015
In vitro selection of VNAR antibodies using bioinformatics-based library design and cDNA display
Hiroki Anzai1, Takuya Terai2, Susumu Mitsuyama1,3
1Laboratory of Aquatic Molecular Biology and Biotechnology, Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
Researchers screened a synthetic variable domain of new antigen receptor (VNAR) library using a complementary DNA (cDNA) display system. This novel approach successfully identified VNARs that bind to specific fluorescent proteins, demonstrating its potential for antibody discovery.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunotechnology
Background:
- Variable domains of new antigen receptors (VNARs), derived from shark immunoglobulin new antigen receptors (IgNARs), are recognized for their compact structure, stability, and unique binding properties.
- VNARs represent a promising class of single-domain antibody therapeutics with potential applications in various biological and medical fields.
Purpose of the Study:
- To demonstrate the feasibility of screening a synthetic VNAR library using a complementary DNA (cDNA) display system.
- To construct and select a VNAR library derived from the brownbanded bamboo shark (Chiloscyllium punctatum).
Main Methods:
- A synthetic VNAR library was created by randomizing the CDR1 and CDR3 loops, achieving a genetic diversity of approximately 1012 sequences.
- The cDNA display system was employed for library construction and screening against fluorescent proteins (EGFP and mNeonGreen) as model antigens.
- Next-generation sequencing and biochemical validation were used to identify and confirm binding VNARs.
Main Results:
- The study successfully screened a synthetic VNAR library using the cDNA display system.
- Two VNAR clones, VNAR-E1 and VNAR-N1, were identified with specific binding affinities for EGFP and mNeonGreen, respectively.
- The results validate the efficacy of the cDNA display system for VNAR selection.
Conclusions:
- This research establishes the first successful application of a cDNA display system for the selection of VNARs.
- The findings highlight the potential of this method for generating novel VNAR-based binders for therapeutic and diagnostic applications.
- The identified VNARs (VNAR-E1 and VNAR-N1) serve as valuable tools for targeting specific fluorescent proteins.
