Animal models and therapeutic molecules

摘要

The invention discloses methods for the generation of chimaeric human—non-human antibodies and chimaeric antibody chains, antibodies and antibody chains so produced, and derivatives thereof including fully humanized antibodies; compositions comprising the disclosed antibodies, antibody chains and derivatives, as well as cells, non-human mammals and vectors, suitable for use in the disclosed methods.

主权项

1. A mouse whose genome comprising a homozygous recombinant immunoglobulin light chain locus,
said homozygous recombinant immunoglobulin light chain locus comprising unrearranged human V light chain gene segments positioned (i) at an endogenous mouse immunoglobulin light chain locus comprising an endogenous light chain enhancer and (ii) upstream of a constant region, said homozygous recombinant light chain locus being functional to rearrange to express an Ig light chain comprising a human V region, wherein said homozygous recombinant immunoglobulin light chain locus comprises human Vλ gene segments and Jλ gene segments operatively linked to an endogenous kappa light chain enhancer at an endogenous kappa locus, wherein at least 80% of the immunoglobulin light chains that comprise λ variable regions expressed in said mouse comprise human λ variable regions, and wherein said mouse comprises IgG comprising human Vλ, wherein said human Vλ and Jλ gene segments comprise at least the functional V and J gene segments from Vλ2-18 to Cλ7 of a human λ light chain locus, wherein said mouse expresses endogenous λ light chain; wherein said mouse comprises B cells expressing an immunoglobulin chain comprising a human Vλ and B cells comprising an immunoglobulin chain comprising an endogenous Vλ, and among said human and endogenous Vλ said human Vλ predominates,
wherein the recombinant immunoglobulin light chain locus comprising human Vλ gene segments and Jλ gene segments is positioned upstream of an endogenous constant kappa region, wherein B cells of said mouse comprise immunoglobulin comprising human λ variable region relative to immunoglobulin comprising mouse λ variable region at a ratio of 80:15.