Mice that make VL binding proteins
Genetically modified mice and methods for making an using them are provided, wherein the mice comprise a replacement of all or substantially all immunoglobulin heavy chain V gene segments, D gene segments, and J gene segments with at least one light chain V gene segment and at least one light chain J gene segment. Mice that make binding proteins that comprise a light chain variable domain operably linked to a heavy chain constant region are provided. Binding proteins that contain an immunoglobulin light chain variable domain, including a somatically hypermutated light chain variable domain, fused with a heavy chain constant region, are provided. Modified cells, embryos, and mice that encode sequences for making the binding proteins are provided.
1. A mouse whose germline genome comprises a modified endogenous mouse immunoglobulin heavy chain locus comprising a replacement of all functional endogenous mouse immunoglobulin heavy chain variable (V H ) gene segments, all functional endogenous mouse immunoglobulin heavy chain diversity (D H ) gene segments and all functional endogenous mouse immunoglobulin heavy chain joining (J H ) gene segments at the endogenous mouse immunoglobulin heavy chain locus with a nucleotide sequence that comprises a plurality of contiguous unrearranged functional human immunoglobulin light chain variable V κ (hV κ ) gene segments and all five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5),
wherein the plurality of unrearranged functional hV κ gene segments and the five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5) are operably linked to an intact endogenous mouse immunoglobulin heavy chain constant region at the endogenous mouse immunoglobulin heavy chain locus,
wherein the plurality of unrearranged functional hV κ gene segments and the five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5) rearrange in a B cell during B cell development to form a rearranged human immunoglobulin light chain variable region V κ /J κ nucleotide sequence operably linked to the endogenous mouse immunoglobulin heavy chain constant region at the endogenous mouse immunoglobulin heavy chain locus, and
wherein the mouse comprises a CD19 + B cell comprising the rearranged human immunoglobulin light chain variable region V κ /J κ nucleotide sequence operably linked to the endogenous mouse immunoglobulin heavy chain constant region at the endogenous mouse immunoglobulin heavy chain locus.
2. The mouse of claim 1 , wherein all the functional endogenous mouse V H , D H , and J H gene segments are replaced with at least 6 human V κ gene segments and the five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5).
3. The mouse of claim 1 , wherein all the functional endogenous mouse V H , D H , and J H gene segments are replaced with at least 16 human V κ gene segments and the five contiguous unrearranged human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5).
4. The mouse of claim 1 , wherein all the functional endogenous mouse V H , D H , and J H gene segments are replaced with at least 30 human V κ gene segments and the five contiguous unrearranged human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5).
5. The mouse of claim 1 , wherein all the functional endogenous mouse V H , D H , and J H gene segments are replaced with at least 40 human V κ gene segments and the five contiguous unrearranged human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5).
6. An isolated cell from the mouse of claim 1 , wherein the cell comprises a modified endogenous mouse immunoglobulin heavy chain locus comprising a replacement of all functional endogenous mouse immunoglobulin heavy chain variable (V H ) gene segments, all functional endogenous mouse immunoglobulin heavy chain diversity (D H ) gene segments and all functional endogenous mouse immunoglobulin heavy chain joining (J H ) gene segments at the endogenous mouse immunoglobulin heavy chain locus with a nucleotide sequence that comprises a plurality of unrearranged functional human immunoglobulin light chain variable Vκ (hV κ ) gene segments and all five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5),
wherein the plurality of unrearranged functional hV κ gene segments and all five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5) are operably linked to an intact endogenous mouse immunoglobulin heavy chain constant region at the endogenous mouse immunoglobulin heavy chain locus,
wherein the plurality of unrearranged functional hV κ gene segments and the five unrearranged functional human immunoglobulin light chain joining gene segments (hJ κ 1-hJ κ 5) are capable of rearranging in a B cell during B cell development to form a rearranged human immunoglobulin light chain variable region V κ /J κ nucleotide sequence operably linked to the endogenous mouse immunoglobulin heavy chain constant region at the endogenous mouse immunoglobulin heavy chain locus.
7. The isolated cell of claim 6 , wherein the cell is an embryonic stem cell.
8. A cell isolated from the mouse of claim 1 , wherein the cell is the CD19 + B cell.
9. A hybridoma comprising a myeloma cell line fused with the CD19 + B cell of claim 8 , wherein the hybridoma produces a polypeptide encoded by the rearranged human immunoglobulin light chain variable region V κ /J κ nucleotide sequence operably linked to the endogenous mouse immunoglobulin heavy chain constant region.
10. The mouse of claim 1 , wherein the rearranged human immunoglobulin light chain variable region V κ /J κ gene sequence comprises at least one N addition.
11. The mouse of claim 1 , wherein the mouse is homozygous or heterozygous for the modified endogenous immunoglobulin heavy chain locus.