Non-human animals expressing pH-sensitive immunoglobulin sequences
First Claim
1. A genetically modified non-human animal comprising in its germline an endogenous immunoglobulin locus that comprises an unrearranged immunoglobulin variable gene sequence comprising in a complementarity determining region 3 (CDR3) encoding sequence a substitution of at least one non-histidine codon with a histidine codon or an insertion of at least one histidine codon,wherein the non-human animal further comprises in vivo a diverse repertoire of antibodies, each of which is specific for an antigen of interest and retains at least one histidine amino acid encoded by the substituted or inserted histidine codon, wherein the at least one histidine amino acid is present in a CDR3 of a variable domain.
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Abstract
Genetically modified non-human animals are provided that express an immunoglobulin variable domain that comprises at least one histidine, wherein the at least one histidine is encoded by a substitution of a non-histidine codon in the germline of the animal with a hisidine codon, or the insertion of a histidine codon in a germline immunoglobulin nucleic acid sequence. Immunoglobulin genes comprising histidines in one or more CDRs, in an N-terminal region, and or in a loop 4 region are also provided. Immunoglobulin variable domains comprising one or more histidines (e.g., histidine clusters) substituted for non-antigen-binding non-histidine residues. Non-human animals that are progeny of animals comprising modified heavy chain variable loci (V, D, J segments), modified light chain variable loci (V, J segments), and rearranged germline light chain genes (VJ sequences) are also provided. Non-human animals that make immunoglobulin domains that bind antigens in a pH-sensitive manner are provided.
71 Citations
43 Claims
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1. A genetically modified non-human animal comprising in its germline an endogenous immunoglobulin locus that comprises an unrearranged immunoglobulin variable gene sequence comprising in a complementarity determining region 3 (CDR3) encoding sequence a substitution of at least one non-histidine codon with a histidine codon or an insertion of at least one histidine codon,
wherein the non-human animal further comprises in vivo a diverse repertoire of antibodies, each of which is specific for an antigen of interest and retains at least one histidine amino acid encoded by the substituted or inserted histidine codon, wherein the at least one histidine amino acid is present in a CDR3 of a variable domain.
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31. A genetically modified non-human animal, comprising
at an endogenous immunoglobulin heavy chain locus at least a portion of an unrearranged human immunoglobulin heavy chain variable region nucleic acid sequence comprising unrearranged human VH, unrearranged human DH, and unrearranged human JH gene segments operably linked to an immunoglobulin heavy chain constant region gene sequence, wherein one or more of the unrearranged human VH, DH, and JH gene segments comprise in a CDR3 encoding sequence at least one substitution of a non-histidine codon with a histidine codon, or at least one histidine codon insertion; - and
at an endogenous immunoglobulin light chain locus at least a portion of an unrearranged human immunoglobulin light chain variable region nucleic acid sequence comprising unrearranged human VL and unrearranged human JL gene segments operably linked to an immunoglobulin light chain constant region gene sequence, wherein one or more of the unrearranged human VL and JL gene segments comprise in a CDR3 encoding sequence at least one substitution of a non-histidine codon with a histidine codon, or at least one histidine codon insertion; wherein the non-human animal comprises a diverse repertoire of antibodies, each of which is specific for an antigen of interest and retains at least one histidine amino acid encoded by the substituted or inserted histidine codon, wherein the at least one histidine amino acid is present in a CDR3 of an immunoglobulin heavy chain variable domain and/or in a CDR3 of an immunoglobulin light chain variable domain. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A genetically modified non-human animal, comprising
at an endogenous heavy chain locus at least a portion of a human unrearranged immunoglobulin heavy chain variable region nucleic acid sequence comprising unrearranged human VH, unrearranged human DH, and unrearranged human JH gene segments operably linked to an immunoglobulin heavy chain constant region gene sequence, wherein one or more of the unrearranged VH, DH, and JH gene segments comprise in a CDR3 encoding sequence at least one substitution of a non-histidine codon with a histidine codon, or at least one histidine codon insertion; - and
at an endogenous light chain locus a rearranged human immunoglobulin light chain variable region nucleic acid sequence comprising a human VL gene segment rearranged with a human JL gene segment operably linked to an immunoglobulin light chain constant region gene sequence, wherein the rearranged human immunoglobulin light chain variable region nucleic acid sequence comprises in a CDR3 encoding sequence at least one substitution of a non-histidine codon with a histidine codon, or at least one histidine codon insertion; wherein the non-human animal comprises in vivo a diverse repertoire of antibodies, each of which are specific for an antigen of interest and retains at least one histidine amino acid encoded by the substituted or inserted histidine codon, wherein the at least one histidine amino acid is present in a CDR3 of an immunoglobulin heavy chain variable domain and/or in a CDR3 of an immunoglobulin light chain variable domain. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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Specification