Patent ID: 9445581
Filing Date: 2016-09-20
CPC Classification: A01K,C07K,C12N

Claim Text:
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,