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 transgenic mouse whose genome comprises an endogenous λ light chain immunoglobulin locus comprising:
i) a deletion of a first endogenous Vλ-Jλ-Cλ gene cluster; and
ii) a replacement of a fragment of endogenous Vλ and Jλ gene segments in a second endogenous Vλ-Jλ-Cλ gene cluster with human Vλ and Jλ gene segments, wherein the human Vλ and Jλ gene segments comprise at least one human Vλ gene segment and at least one human Jλ gene segment, and wherein the human Vλ and Jλ gene segments are operably linked to a mouse Cλ gene.
2. The transgenic mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise a human Jλ1 gene segment.
3. The transgenic mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise four human Jλ gene segments.
4. The transgenic mouse of claim 3 , wherein the four human Jλ gene segments are Jλ1, Jλ2, Jλ3 and Jλ7.
5. The transgenic mouse of claim 1 , wherein the endogenous mouse Vλ gene segments of the second endogenous Vλ-Jλ-Cλ gene cluster have been replaced with a contiguous sequence of the human immunoglobulin λ light chain locus that spans from a human Vλ3-12 gene segment to a human Vλ3-1 gene segment.
6. The transgenic mouse of claim 1 , wherein the replacement endogenous mouse Vλ gene segments of the second endogenous Vλ-Jλ-Cλ gene cluster have been replaced with a contiguous sequence of the human immunoglobulin λ light chain locus that spans from a human Vλ3-27 gene segment to a human Vλ3-1 gene segment.
7. The transgenic mouse of claim 1 , wherein the replacement comprises endogenous mouse Vλ gene segments of the second endogenous Vλ-Jλ-Cλ gene cluster have been replaced with a contiguous sequence of the human immunoglobulin λ light chain locus that spans from a human Vλ3-27 gene segment to a human Vλ3-1 gene segment and a contiguous sequence of the human immunoglobulin λ light chain locus that spans from a human Vλ5-52 gene segment to a human Vλ1-40 gene segment.
8. The transgenic mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise at least 12 human Vλ gene segments.
9. The transgenic mouse of claim 8 , wherein the 12 human Vλ gene segments include human Vλ3-1, Vλ4-3, Vλ2-8, Vλ3-9, Vλ3-10, Vλ2-11 and Vλ3-12.
10. The transgenic mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise at least 28 human Vλ gene segments.
11. The transgenic mouse of claim 10 , wherein the 28 human Vλ gene segments include human Vλ2-14, Vλ3-16, Vλ2-18, Vλ3-19, Vλ3-21, Vλ3-22, Vλ2-23, Vλ3-25 and Vλ3-27.
12. The transgenic mouse of claim 1 , wherein the human Vλ and Jλ gene segments comprise at least 40 human Vλ gene segments.
13. The transgenic mouse of claim 12 , wherein the 40 human Vλ gene segments include human Vλ5-52, Vλ1-51, Vλ9-49, Vλ1-47, Vλ7-46, Vλ5-45, Vλ1-44, Vλ1-44, Vλ7-43 and Vλ1-40.