High-affinity IgG antibodies develop naturally in Ig-knockout rats carrying germline human IgH/Igκ/Igλ loci bearing the rat C[H] region

Abstract : Mice transgenic for human Ig loci are an invaluable resource for the production of human Abs. However, such mice often do not yieldhumanmAbsaseffectivelyasconventionalmice yieldmousemAbs.Suboptimalefficacy indeliveryofhumanAbsmightreflect imperfect interaction between the human membrane IgH chains and the mouse cellular signaling machinery. To obviate this problem, in this study we generated a humanized rat strain (OmniRat) carrying a chimeric human/rat IgH locus (comprising 22 human VHs, all human D and JH segments in natural configuration linked to the rat CH locus) together with fully human IgL loci (12 Vks linked to Jk-Ck and 16 Vls linked to Jl-Cl). The endogenous Ig loci were silenced using designer zinc finger nucleases. Breeding to homozygosity resulted in a novel transgenic rat line exclusively producing chimeric Abs with human idiotypes. B cell recovery was indistinguishable from wild-type animals, and human V(D)J transcripts were highly diverse. Following immunization, the OmniRat strain performed as efficiently as did normal rats in yielding high-affinity serum IgG. mAbs, comprising fully human variable regions with subnanomolar Ag affinity and carrying extensive somatic mutations, are readily obtainable, similarly to conventional mAbs from normal rats.
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Michael Osborn, Biao Ma, Suzanne Avis, Ashleigh Binnie, Jeanette Dilley, et al.. High-affinity IgG antibodies develop naturally in Ig-knockout rats carrying germline human IgH/Igκ/Igλ loci bearing the rat C[H] region. Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2013, 190 (4), pp.1481-1490. ⟨10.4049/jimmunol.1203041⟩. ⟨inserm-02165592⟩

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