Human lambda light chain mice
Genetically modified mice are provided that express human λ variable (hVλ) sequences, including mice that express hVλ sequences from an endogenous mouse λ light chain locus, mice that express hVλ sequences from an endogenous mouse κ light chain locus, and mice that express hVλ sequences from a transgene or an episome wherein the hVλ sequence is linked to a mouse constant sequence. Mice are provided that are a source of somatically mutated human λ variable sequences useful for making antigen-binding proteins. Compositions and methods for making antigen-binding proteins that comprise human λ variable sequences, including human antibodies, are provided.
1. A mouse whose genome comprises an endogenous κ light chain immunoglobulin locus comprising a replacement of endogenous Vκ and Jκ gene segments with human Vλ and Jλ gene segments, and wherein the human Vλ and Jλ gene segments are operably linked to a mouse Cκ gene such that the mouse expresses an immunoglobulin light chain that comprises a human λ variable sequence fused with a mouse κ constant region.
2. The mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise at least 12 human Vλ gene segments.
3. The mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise at least 28 hVλ gene segments.
4. The mouse of claim 1 , wherein human Vλ and Jλ gene segments comprise at least 40 human Vλ gene segments.
5. The mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise a human Jλ1 gene segment.
6. The mouse of claim 1 , wherein the mouse further comprises a human Vκ-Jκ intergenic region sequence located between the human Vλ gene segments and the human Jλ gene segments, wherein the Vκ-Jκ intergenic region is the region located about 130 bp downstream of the 3′ untranslated region of a human Vκ4-1 gene segment to about 600 bp upstream of a human JK1 gene segment as found in a human genome.
7. The mouse of claim 6 , wherein the human Vκ-Jκ intergenic region sequence comprises SEQ ID NO: 100.