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 comprising in its genome an endogenous λ light chain immunoglobulin locus comprising a deletion of the endogenous mouse Vλ1-Jλ3-Cλ3-Jλ1-Cλ1 gene cluster and a deletion of a region spanning from Vλ2 to Jλ2 of the endogenous mouse Vλ2-Vλ3-Jλ2-Cλ2-Jλ4-Cλ4 gene cluster.
2. The transgenic mouse of claim 1 , wherein the endogenous λ light chain immunoglobulin locus comprises endogenous Cλ2, Jλ4 and Cλ4 gene segments.
3. The transgenic mouse of claim 1 , wherein the endogenous λ light chain immunoglobulin locus is functionally silenced.
4. The transgenic mouse of claim 3 , wherein the mouse exclusively expresses endogenous κ light chains in its antibody repertoire.
5. The transgenic mouse of claim 1 , wherein the endogenous λ light chain immunoglobulin locus comprises the endogenous mouse enhancer 2.4.
6. The transgenic mouse of claim 1 , wherein the endogenous λ light chain immunoglobulin locus comprises the endogenous mouse 3′ enhancer 3.1.
7. The transgenic mouse of claim 2 , wherein the endogenous λ light chain immunoglobulin locus further comprises unrearranged human Vλ and Jλ gene segments operably linked to the endogenous Cλ2 gene segment.
8. The transgenic mouse of claim 7 , wherein the unrearranged human Vλ and Jλ gene segments comprise a human Jλ1 gene segment.
9. The transgenic mouse of claim 7 , wherein the unrearranged human Vλ and Jλ gene segments comprise at least 12 human Vλ gene segments.
10. The transgenic mouse of claim 7 , wherein the unrearranged human Vλ and Jλ gene segments comprise at least 28 human Vλ gene segments.
11. The transgenic mouse of claim 7 , wherein the unrearranged human Vλ and Jλ gene segments comprise at least 40 human Vλ gene segments.
12. The transgenic mouse of claim 1 , wherein the mouse further comprises in its genome an endogenous κ light chain immunoglobulin locus comprising a replacement of endogenous Vκ and Jκ gene segments with unrearranged human Vλ and Jλ gene segments, and wherein the human Vλ and Jλ gene segments are operably linked to an endogenous 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.
13. The transgenic mouse of claim 12 , wherein the unrearranged human Vλ and Jλ gene segments comprise a human Jλ1 gene segment.
14. The transgenic mouse of claim 12 , wherein the unrearranged human Vλ and Jλ gene segments comprise at least 12 human Vλ gene segments.
15. The transgenic mouse of claim 12 , 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 Jκ1 gene segment as found in a human genome.
16. The transgenic mouse of claim 15 , wherein the human Vκ-Jκ intergenic region sequence comprises SEQ ID NO: 100.
17. A mouse cell comprising in its genome an endogenous λ light chain immunoglobulin locus comprising a deletion of the endogenous mouse Vλ1-Jλ3-Cλ3-Jλ1-Cλ1 gene cluster and a deletion of a region spanning from Vλ2 to Jλ2 of the endogenous mouse Vλ2-Vλ3-Jλ2-Cλ2-Jλ4-Cλ4 gene cluster.
18. The mouse cell of claim 17 , wherein the endogenous λ light chain immunoglobulin locus retains endogenous Cλ2, Jλ4 and Cλ4 gene segments.
19. The mouse cell of claim 17 , wherein the endogenous λ light chain immunoglobulin locus comprises the endogenous mouse enhancer 2.4.
20. The mouse cell of claim 17 , wherein the endogenous λ light chain immunoglobulin locus comprises the endogenous mouse 3′ enhancer 3.1.
21. The mouse cell of claim 17 , wherein the cell is a B cell.
22. The mouse cell of claim 17 , wherein the cell is a hybridoma.
23. The mouse cell of claim 17 , wherein the cell is an ES cell.