The approval of the first VHH-based drug caplacizumab (anti-von Willebrand factor) has validated a two-decade long commitment in time and research effort to realize the clinical potential of single-domain antibodies. The variable domain (VNAR) of the immunoglobulin new antigen receptor (IgNAR) found in sharks provides an alternative small binding domain to conventional monoclonal antibodies and their fragments and heavy-chain antibody-derived VHHs. Evolutionarily distinct from mammalian antibody variable domains, VNARs have enhanced thermostability and unusual convex paratopes. This predisposition to bind cryptic and recessed epitopes has facilitated both the targeting of new antigens and new (neutralizing) epitopes on existing antigens. Together these unique properties position the VNAR platform as an alternative non-antibody binding domain for therapeutic drug, diagnostic and reagent development. In this introductory chapter, we highlight recent VNAR advancements that further underline the exciting potential of this discovery platform.
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