US20170164588A1 - Non-human animals expressing humanized cd3 complex - Google Patents

Non-human animals expressing humanized cd3 complex Download PDF

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US20170164588A1
US20170164588A1 US14/949,834 US201514949834A US2017164588A1 US 20170164588 A1 US20170164588 A1 US 20170164588A1 US 201514949834 A US201514949834 A US 201514949834A US 2017164588 A1 US2017164588 A1 US 2017164588A1
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human
mouse
antigen
protein
animal
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Kara L. Olson
Eric Smith
Ka-Man Venus LAI
Andrew J. Murphy
Gavin Thurston
Dayong Guo
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Regeneron Pharmaceuticals Inc
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Regeneron Pharmaceuticals Inc
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Application filed by Regeneron Pharmaceuticals Inc filed Critical Regeneron Pharmaceuticals Inc
Priority to US14/949,834 priority Critical patent/US20170164588A1/en
Assigned to REGENERON PHARMACEUTICALS, INC. reassignment REGENERON PHARMACEUTICALS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAI, KA-MAN VENUS, MURPHY, ANDREW J., SMITH, ERIC, THURSTON, GAVIN, GUO, DAYONG, OLSON, Kara L.
Publication of US20170164588A1 publication Critical patent/US20170164588A1/en
Priority to US16/872,226 priority patent/US10932455B2/en
Priority to US17/118,241 priority patent/US11937587B2/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
    • A01K67/027—New or modified breeds of vertebrates
    • A01K67/0275—Genetically modified vertebrates, e.g. transgenic
    • A01K67/0278—Knock-in vertebrates, e.g. humanised vertebrates
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
    • A01K67/027—New or modified breeds of vertebrates
    • A01K67/0275—Genetically modified vertebrates, e.g. transgenic
    • A01K67/0276—Knock-out vertebrates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
    • C07K14/70503—Immunoglobulin superfamily
    • C07K14/7051—T-cell receptor (TcR)-CD3 complex
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
    • C12N15/8509—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells for producing genetically modified animals, e.g. transgenic
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/06—Animal cells or tissues; Human cells or tissues
    • C12N5/0602—Vertebrate cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
    • G01N33/5008—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
    • G01N33/5082—Supracellular entities, e.g. tissue, organisms
    • G01N33/5088—Supracellular entities, e.g. tissue, organisms of vertebrates
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2207/00—Modified animals
    • A01K2207/12—Animals modified by administration of exogenous cells
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2207/00—Modified animals
    • A01K2207/15—Humanized animals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/07—Animals genetically altered by homologous recombination
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/07—Animals genetically altered by homologous recombination
    • A01K2217/072—Animals genetically altered by homologous recombination maintaining or altering function, i.e. knock in
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/07—Animals genetically altered by homologous recombination
    • A01K2217/075—Animals genetically altered by homologous recombination inducing loss of function, i.e. knock out
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/15—Animals comprising multiple alterations of the genome, by transgenesis or homologous recombination, e.g. obtained by cross-breeding
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2227/00—Animals characterised by species
    • A01K2227/10—Mammal
    • A01K2227/105—Murine
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2267/00—Animals characterised by purpose
    • A01K2267/01—Animal expressing industrially exogenous proteins
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2267/00—Animals characterised by purpose
    • A01K2267/03—Animal model, e.g. for test or diseases
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2267/00—Animals characterised by purpose
    • A01K2267/03—Animal model, e.g. for test or diseases
    • A01K2267/0337—Animal models for infectious diseases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • a genetically modified non-human animal e.g., a rodent, e.g., a mouse or a rat
  • a rodent e.g., a mouse or a rat
  • a humanized CD3 protein e.g., a humanized CD3 ⁇ , a humanized CD3 ⁇ , and/or humanized CD3 ⁇ .
  • genetically modified non-human animals that express humanized CD3 complex are provided.
  • a model for preclinical testing of CD3-based therapeutics e.g., CD3-based antibodies, e.g., CD3-based bispecific antibodies.
  • the T cell receptor complex on the surface of a T cell comprises invariant CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ chains, which form heterodimers consisting of CD3 ⁇ and CD3 ⁇ . Also associated with the TCR/CD3 complex is the ⁇ chain, which is present as a disulfide-linked homodimer.
  • CD3 chains play a crucial role in T cell receptor assembly, transport to the cell surface, endocytosis of surface receptors, T cell development, and T cell signaling. For example, it has been demonstrated through studies of deficiencies of various CD3 subunits, that CD3 chains are important for double negative (CD4 ⁇ CD8 ⁇ or DN) to double positive (CD4+CD8+ or DP) to single positive (CD4+ or CD8+ or SP) T cell transition.
  • each of CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ chains contains one immunoreceptor tyrosine-based activation motif (ITAM) while the ⁇ chain dimer contains 6 total ITAMs. These motifs serve as signaling modules, and are phosphorylated by associated kinases upon TCR engagement.
  • ITAM immunoreceptor tyrosine-based activation motif
  • Antibodies against CD3 have been shown to cluster CD3 on T cells, thereby causing T cell activation in a manner similar to the engagement of the TCR by peptide-loaded MHC molecules.
  • anti-CD3 antibodies have been proposed as therapeutic candidates aimed at activation of T cells.
  • bispecific antibodies that are capable of binding CD3 and a target antigen have been proposed for therapeutic uses involving targeting T cell immune responses to tissues and cells expressing the target antigen.
  • a convenient animal model for preclinical testing of mono- and bispecific CD3-based therapeutic antibodies is particularly desired.
  • a genetically modified non-human animal comprising at an endogenous non-human CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 protein, wherein the human CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof.
  • the non-human animal comprises at the endogenous non-human CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 ⁇ , an extracellular domain of human CD3 ⁇ , and an extracellular domain of human CD3 ⁇ .
  • the animal does not comprise a functional extracellular domain(s) of the corresponding non-human protein(s).
  • the animal further comprises a nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of corresponding endogenous non-human animal CD3 protein(s).
  • the nucleic acid sequence(s) encoding the extracellular domain of the human CD3 in the non-human animal is operably linked to the nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of the corresponding endogenous non-human animal CD3 protein(s).
  • the non-human animal comprises (a) at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ , (b) at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ , and (c) at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ .
  • the extracellular domain of the human CD3 protein in the non-human animal comprises the sequence selected from the group consisting of SEQ ID NO:33, SEQ ID NO:34, and SEQ ID NO:35.
  • the animal comprises extracellular domains of human CD3 proteins which comprise the sequences of SEQ ID NO:33, SEQ ID NO:34 and SEQ ID NO:35.
  • the non-human animal provided is a mammal.
  • the animal is a rodent.
  • the animal is a rat or a mouse.
  • the animal is a mouse.
  • a genetically modified mouse wherein the mouse comprises (a) at an endogenous mouse CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous mouse CD3 ⁇ , (b) at an endogenous mouse CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous mouse CD3 ⁇ , and (c) at an endogenous mouse CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human
  • the amino acid sequence of the humanized CD3 ⁇ protein in said mouse is set forth in SEQ ID NO:24, the amino acid sequence of the humanized CD3 ⁇ protein is set forth in SEQ ID NO:25, and the amino acid sequence of the humanized CD3 ⁇ protein is set forth in SEQ ID NO:26.
  • the mouse displays similar CD4+ to CD8+ cell ratio in the thymus as compared to a mouse that is not genetically modified to express humanized CD3 proteins.
  • the mouse CD4+ to CD8+ T cell ratio in the thymus that is within 30%, within 25%, within 20%, within 15%, within 12%, within 10%, within 5%, or within 2% of the CD4+ to CD8+ cell ratio of a mouse that is not genetically modified to express humanized CD3 proteins.
  • the mouse displays similar T and B cell percentages in spleen, lymph nodes, and peripheral blood as a mouse that is not genetically modified to express humanized CD3 proteins.
  • the mouse displays similar numbers of circulating white blood cells, lymphocytes, monocytes, neutrophils, eosinophils, and basophils as a mouse that is not genetically modified to express humanized CD3 proteins.
  • a genetically modified mouse comprising at an endogenous mouse CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 protein, wherein the human CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof.
  • the mouse comprises extracellular domains of human CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ .
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:33
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:34
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:35.
  • the mouse expresses a humanized CD3 ⁇ , a humanized CD3 ⁇ , and a humanized CD3 ⁇ .
  • the humanized CD3 ⁇ is set forth in SEQ ID NO:24
  • the humanized CD3 ⁇ is set forth in SEQ ID NO:25
  • the humanized CD3 ⁇ is set forth in SEQ ID NO:26.
  • the mouse further comprises mouse CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ transmembrane and cytoplasmic domains.
  • the mouse further comprises endogenous mouse CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ transmembrane and cytoplasmic domains.
  • a method of making a genetically modified non-human animal expressing a humanized CD3 protein comprising placing at an endogenous non-human animal CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 protein, wherein the human CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof.
  • the animal does not comprise a functional extracellular domain(s) of the corresponding non-human protein(s).
  • the animal comprises at the endogenous CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 ⁇ , an extracellular domain of human CD3 ⁇ , and an extracellular domain of human CD3 ⁇ .
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:33
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:34
  • the extracellular domain of human CD3 ⁇ is set forth in SEQ ID NO:35.
  • the animal does not comprise functional extracellular domain(s) of the corresponding non-human protein(s).
  • the method comprises replacing at the endogenous CD3 locus an extracellular domain of a non-human CD3 protein(s) with a corresponding extracellular domain of a human CD3 protein(s).
  • the animal further comprises a nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of corresponding endogenous non-human animal CD3 protein(s).
  • the non-human animal is a mouse and a replacement is at the endogenous mouse CD3 locus.
  • the mouse expresses a humanized CD3 protein selected from the group consisting of a humanized CD3 ⁇ set forth in SEQ ID NO: 24, a humanized CD3 ⁇ set forth in SEQ ID NO:25, a humanized CD3 ⁇ set forth in SEQ ID NO:26, and a combination thereof.
  • the replacement is made in a single ES cell, and the single ES cell is introduced into the mouse embryo to make a mouse.
  • a mouse model for testing a CD3-based bispecific antigen-binding protein wherein the antigen-binding protein is capable of binding both CD3 and an antigen of interest
  • the mouse model comprising (a) a nucleic acid sequence encoding a humanized CD3 protein, wherein the humanized CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof, and wherein the mouse comprises a T cell expressing said humanized CD3 protein, and (b) a cell expressing or comprising the antigen of interest.
  • the nucleic acid sequence(s) of the humanized CD3 protein(s) is located at the endogenous CD3 locus.
  • the antigen-binding protein has been introduced into said mouse.
  • the mouse expresses human CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ extracellular domains.
  • the mouse further expresses mouse CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ transmembrane and cytoplasmic domains.
  • the mouse comprises a xenograft of a tumor expressing the antigen of interest.
  • the cell expressing or comprising the antigen of interest is a tumor cell.
  • the bispecific antigen-binding protein selected binds to both the humanized CD3 protein and the antigen of interest.
  • the antigen of interest is a human antigen.
  • the antigen binding protein is capable of binding a monkey CD3 protein.
  • the antigen of interest is a tumor associated antigen.
  • the tumor associated antigen may be selected from the group consisting of AFP, ALK, BAGE proteins, ⁇ -catenin, brc-abl, BRCA1, BORIS, CA9, carbonic anhydrase IX, caspase-8, CCR5, CD19, CD20, CD30, CD40, CDK4, CEA, CTLA4, cyclin-B1, CYP1B1, EGFR, EGFRvIII, ErbB2/Her2, ErbB3, ErbB4, ETV6-AML, EpCAM, EphA2, Fra-1, FOLR1, GAGE protein, GD2, GD3, GloboH, glypican-3, GM3, gp100, Her2, HLA/B-raf, HLA/k-ras, HLA/MAGE-A3, hTERT, LMP2, MAGE protein, MART-1, mesothelin, ML-IAP, Muc1, Muc2, Muc3, Muc4, Muc5, Muc16 (CA-125),
  • the antigen of interest is an infectious disease associated antigen.
  • the mouse may be infected with an infectious agent.
  • the infectious disease associated antigen may be a viral antigen and the viral antigen is selected from the group consisting of HIV, hepatitis A, hepatitis B, hepatitis C, herpes virus (e.g., HSV-1, HSV-2, CMV, HAV-6, VZV, Epstein Barr virus), adenovirus, influenza virus, flavivirus, echovirus, rhinovirus, coxsackie virus, coronavirus, respiratory syncytial virus, mumps virus, rotavirus, measles virus, rubella virus, parvovirus, vaccinia virus, HTLV, dengue virus, papillomavirus, molluscum virus, poliovirus, rabies virus, JC virus, ebola virus, and arboviral encephalitis virus antigen.
  • herpes virus e.g., HSV-1, HSV
  • the CD3-based antigen-binding protein is an antibody. In one embodiment, the CD3-based antigen-binding protein is a human or humanized antigen-binding protein. Such mouse model may allow testing for efficacy and/or toxicity of the antigen-binding protein in the mouse.
  • Also provided herein is a method of screening drug candidates that target an antigen of interest comprising (a) providing or receiving a genetically modified mouse comprising at its endogenous mouse CD3 locus a nucleic acid sequence encoding an extracellular domain of a human CD3 protein selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof, wherein the mouse expresses a functional humanized CD3 protein on the surface of its T cells, (b) introducing into the said genetically modified mouse the antigen of interest, (c) contacting said mouse with a drug candidate of interest, wherein the drug candidate is directed against the human CD3 and the antigen of interest, and (d) determining if the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest.
  • the genetically modified mouse comprises at the endogenous mouse CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 ⁇ , an extracellular domain of human CD3 ⁇ , and an extracellular domain of human CD3 ⁇ . In one embodiment of the method, the mouse does not comprise a functional extracellular domain of the corresponding mouse protein(s). In one embodiment of the method, the mouse comprises a nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of corresponding endogenous mouse CD3 protein(s).
  • the nucleic acid sequence(s) encoding the extracellular domain of the human CD3 is operably linked to the nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of the corresponding endogenous mouse CD3 protein(s).
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:33
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:34
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:35.
  • the mouse expresses a humanized CD3 ⁇ protein comprising an amino acid sequence set forth in SEQ ID NO:24, a humanized CD3 ⁇ protein comprising an amino acid sequence set forth in SEQ ID NO:25, and a humanized CD3 ⁇ protein comprising an amino acid sequence set forth in SEQ ID NO:26.
  • the step of introducing the antigen of interest into the mouse described herein comprises expressing in the mouse the antigen of interest.
  • the step of expressing in the mouse the antigen of interest comprises genetically modifying the mouse to express the antigen of interest.
  • the step of introducing the antigen of interest comprises infecting the mouse with the antigen of interest.
  • the step of introducing comprises introducing into said mouse a cell expressing the antigen of interest.
  • the cell can be a tumor cell, a bacterial cell, or a cell infected with a virus.
  • the mouse comprises and infection which is either a viral or bacterial infection.
  • the antigen of interest can be an infectious disease associated antigen.
  • the antigen of interest is a viral antigen
  • the viral antigen is selected from the group consisting of HIV, hepatitis A, hepatitis B, hepatitis C, herpes virus (e.g., HSV-1, HSV-2, CMV, HAV-6, VZV, Epstein Barr virus), adenovirus, influenza virus, flavivirus, echovirus, rhinovirus, coxsackie virus, coronavirus, respiratory syncytial virus, mumps virus, rotavirus, measles virus, rubella virus, parvovirus, vaccinia virus, HTLV, dengue virus, papillomavirus, molluscum virus, poliovirus, rabies virus, JC virus, ebola virus, and arboviral encephalitis virus antigen.
  • the antigen of interest is an infectious disease associated antigen, which is a bacterial antigen selected from the group consisting of chlamydia, rickettsia, mycobacteria, staphylococci, streptococci, pneumonococci, meningococci, gonococci, klebsiella, proteus, serratia, pseudomonas, legionella, diphtheria, salmonella, bacilli, cholera, tetanus, botulism, anthrax, plague, leptospira, and Lyme disease bacterial antigen.
  • infectious disease associated antigen which is a bacterial antigen selected from the group consisting of chlamydia, rickettsia, mycobacteria, staphylococci, streptococci, pneumonococci, meningococci, gonococci, klebsiella, proteus, serratia, pseudomonas, legionella, diphtheria, salmonella,
  • the antigen of interest is a tumor associated antigen.
  • the tumor associated antigen is selected from the group consisting of AFP, ALK, BAGE proteins, ⁇ -catenin, brc-abl, BRCA1, BORIS, CA9, carbonic anhydrase IX, caspase-8, CCR5, CD19, CD20, CD30, CD40, CDK4, CEA, CTLA4, cyclin-B1, CYP1B1, EGFR, EGFRvIII, ErbB2/Her2, ErbB3, ErbB4, ETV6-AML, EpCAM, EphA2, Fra-1, FOLR1, GAGE protein, GD2, GD3, GloboH, glypican-3, GM3, gp100, Her2, HLA/B-raf, HLA/k-ras, HLA/MAGE-A3, hTERT, LMP2, MAGE protein, MART-1, mesothelin, ML-I
  • the mouse is an immunocompetent mouse.
  • the antigen of interest is a human antigen of interest.
  • the drug candidate is an antibody. In some embodiments, the drug candidate is an antigen-binding protein. In some embodiments, wherein the drug candidate is an antibody, the antibody is a bispecific antibody or a bispecific antigen binding protein. In some embodiments, the bispecific antigen binding protein is capable of binding both human CD3 protein and the antigen of interest. In one embodiment, the drug candidate is capable of recognizing a monkey CD3 protein.
  • the drug candidate is capable of reducing, eliminating, or preventing tumor growth as compared to an agent that does not target the antigen of interest.
  • the step of determining if the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest comprises a tumor volume assay or a T cell mediated tumor cell killing assay.
  • the drug candidate is capable of reducing, eliminating, or preventing bacterial or viral infection as compared to an agent that does not target the antigen of interest.
  • the step of determining if the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest comprises the measurement of viral or bacterial titers.
  • FIG. 1 depicts the structure of T cell receptor complex.
  • the complex comprises two CD3 ⁇ subunits, one CD3 ⁇ subunit, one CD3 ⁇ subunit, and two CD3 ⁇ subunits, complexed with the TCR ⁇ heterodimer on a T cell surface.
  • Asterisks indicate the locations of the ITAM motifs.
  • FIG. 2 is the schematic representation (not to scale) of the humanized CD3 ⁇ large targeting vector.
  • FIG. 2A depicts the large targeting vector before the selection cassette (Neo) deletion, with human CD3E, CD3D, and CD3G sequence knock-in locations indicated.
  • A, B, C, D, E, F, and G indicate location of the junction nucleic acid sequences represented in Table 1.
  • FIG. 2B depicts the large targeting vector after deletion of the selection cassette (Neo); similarly to FIG. 2A , locations of the human CD3E, CD3D, and CD3G are indicated.
  • A-B, C, D, E, F, and G are locations of the junction nucleic acid sequences represented in Tables 1 and 3.
  • FIG. 3 depicts the amino acid sequences of the humanized CD3 proteins in the humanized CD3 ⁇ mice.
  • the CD3 protein sequences of human origin are underlined.
  • FIG. 4 depicts alignments between mouse and human CD3e, CD3d, and CD3g sequences.
  • the 5′ and 3′ ends of the human sequences that were introduced into mouse CD3 loci are marked with * and **, respectively.
  • FIG. 5 top row, is a FACs analysis plot demonstrating normal distribution of CD4+ and CD8+ thymocytes in wild type (WT), heterozygous humanized CD3 ⁇ (HET), or homozygous humanized CD3 ⁇ (H0) mice.
  • WT wild type
  • HET heterozygous humanized CD3 ⁇
  • H0 homozygous humanized CD3 ⁇ mice.
  • the middle row is data depicting percentages as well as numbers of B and T cells in peripheral blood of indicated animals.
  • Bottom row is data depicting percentages of T and B cells in the spleen of indicated animals.
  • FIG. 6 is a demonstration of viral LCMV titers in the spleens of either wild type control or humanized CD3 ⁇ mice in mice infected with LCMV Clone 13 ( FIG. 6A ), or LCMV clone 13 following prior LCMV Armstrong clone infection ( FIG. 6B ).
  • FIG. 7 is data from the FACS analysis of splenocytes from wild type (WT), heterozygous humanized CD3 ⁇ (hCD3 ⁇ Het), or homozygous humanized CD3 ⁇ (hCD3 ⁇ Ho) mice sorted with two anti-human CD3 antibodies that also cross-react with monkey CD3 (ah/mfCD3-2 and ah/mfCD3-1), two anti-human CD3 antibodies that are human CD3 specific (ahCD3-1 and ahCD3-2), control anti-mouse CD3 (amCD3-2C11), unrelated control human IgG (control hIgG) and secondary only antibody control (2 nd only).
  • WT wild type
  • hCD3 ⁇ Het heterozygous humanized CD3 ⁇
  • hCD3 ⁇ Ho homozygous humanized CD3 ⁇ mice sorted with two anti-human CD3 antibodies that also cross-react with monkey CD3 (ah/mfCD3-2 and ah/mfCD3-1), two anti-human CD3 antibodies that are
  • FIGS. 8A-B demonstrate response to anti-CD3 antibodies in humanized CD3 ⁇ mice.
  • FIG. 8A demonstrates transient T and B cell depletion in blood of mice treated with anti-CD3 antibodies; either T cell depletion on day 1 for each antibody indicated (left figure), or T and B cell depletion and recovery over 14 days for each antibody tested (middle and right figures).
  • FIG. 8B depicts an increase in concentration of cytokines released (IFN ⁇ , KC, TNF ⁇ , IL-6, and IL-10) 2 hours after treatment with indicated antibodies.
  • FIG. 9 demonstrates splenocytes proliferation (measured as fold activation over cells only) upon treatment with increasing amounts of indicated antibodies in wild type (WT) and humanized CD3 ⁇ homozygous (hCD3 ⁇ Ho) mice.
  • FIG. 10 is a table summarizing various properties of the humanized CD3 mouse model.
  • FIG. 11A demonstrates the effect of anti-CD3 antibody (Ab-1; bispecific antibody recognizing CD3 and CD20, tested at two different concentrations) on tumor volume of B16F10.9/CD20 tumors when treatment is initiated at the same time as tumor implantation (prophylactic model).
  • FIG. 11B demonstrates the effect of anti-CD3 antibody (Ab-1; bispecific antibody recognizing CD3 and CD20, tested at two different concentrations) on tumor volume of already established B16F10.9/CD20 tumors (therapeutic model).
  • the present invention provides genetically modified non-human animals, e.g., rodents, e.g., mice or rats, that express humanized CD3 proteins, e.g., humanized CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and/or CD3 ⁇ proteins.
  • the present invention also relates to genetically modified non-human animals that comprise in their genome, e.g., in their germline, genetically modified CD3 loci encoding humanized CD3 proteins, e.g., chimeric human/mouse CD3 proteins.
  • embryos, cells, and tissues comprising the same, methods of making the same, as well as methods of using the same. Unless defined otherwise, all terms and phrases used herein include the meanings that the terms and phrases have attained in the art, unless the contrary is clearly indicated or clearly apparent from the context in which the term or phrase is used.
  • CD3 includes an antigen which is expressed on T cells as part of the multimolecular T cell receptor (TCR) complex and which exists as a homodimer or heterodimer formed from the association of two of four receptor chains: CD3-epsilon ( ⁇ ), CD3-delta ( ⁇ ), CD3-zeta ( ⁇ ), and CD3-gamma ( ⁇ ). Sequences and GenBank Accession Numbers of human and mouse CD3-delta, CD3-zeta, and CD3-gamma are presented in Table 4 below. Throughout the application, ⁇ or epsilon can also be written as E, ⁇ or delta can also be written as D, ⁇ or zeta can also be written as Z, and ⁇ or gamma can also be written as G.
  • TCR multimolecular T cell receptor
  • an antibody that binds CD3 or an “anti-CD3 antibody” includes antibodies and antigen-binding fragments thereof that specifically recognize a single CD3 subunit (e.g., epsilon, delta, gamma or zeta), as well as antibodies and antigen-binding fragments thereof that specifically recognize a dimeric complex of two CD3 subunits (e.g., gamma/epsilon, delta/epsilon, and zeta/zeta CD3 dimers).
  • the antibodies and antigen-binding fragments of the present invention may bind soluble CD3 and/or cell surface expressed CD3.
  • Soluble CD3 includes natural CD3 proteins as well as recombinant CD3 protein variants such as, e.g., monomeric and dimeric CD3 constructs, that lack a transmembrane domain or are otherwise unassociated with a cell membrane.
  • conservative amino acid substitution when used to describe a conservative amino acid substitution, includes substitution of an amino acid residue by another amino acid residue having a side chain R group with similar chemical properties (e.g., charge or hydrophobicity). Conservative amino acid substitutions may be achieved by modifying a nucleotide sequence so as to introduce a nucleotide change that will encode the conservative substitution. In general, a conservative amino acid substitution will not substantially change the functional properties of interest of a protein, for example, the ability of CD3 proteins to play a role in T cell receptor assembly and signaling.
  • groups of amino acids that have side chains with similar chemical properties include aliphatic side chains such as glycine, alanine, valine, leucine, and isoleucine; aliphatic-hydroxyl side chains such as serine and threonine; amide-containing side chains such as asparagine and glutamine; aromatic side chains such as phenylalanine, tyrosine, and tryptophan; basic side chains such as lysine, arginine, and histidine; acidic side chains such as aspartic acid and glutamic acid; and, sulfur-containing side chains such as cysteine and methionine.
  • aliphatic side chains such as glycine, alanine, valine, leucine, and isoleucine
  • aliphatic-hydroxyl side chains such as serine and threonine
  • amide-containing side chains such as asparagine and glutamine
  • aromatic side chains such as phenylalanine, tyrosine, and trypto
  • Conservative amino acids substitution groups include, for example, valine/leucine/isoleucine, phenylalanine/tyrosine, lysine/arginine, alanine/valine, glutamate/aspartate, and asparagine/glutamine.
  • a conservative amino acid substitution can be a substitution of any native residue in a protein with alanine, as used in, for example, alanine scanning mutagenesis.
  • a conservative substitution is made that has a positive value in the PAM250 log-likelihood matrix disclosed in Gonnet et al. ((1992) Exhaustive Matching of the Entire Protein Sequence Database, Science 256:1443-45), hereby incorporated by reference.
  • the substitution is a moderately conservative substitution wherein the substitution has a nonnegative value in the PAM250 log-likelihood matrix.
  • a genetically modified non-human animal e.g., rodent, e.g., mouse or rat, expressing a humanized CD3 protein(s) comprising conservative amino acid substitutions in the amino acid sequence described herein.
  • nucleic acid residues encoding humanized CD3 proteins described herein due to the degeneracy of the genetic code, other nucleic acids may encode the polypeptides of the invention. Therefore, in addition to a genetically modified non-human animal that comprises in its genome nucleotide sequences encoding humanized CD3 proteins described herein, a non-human animal that comprises in its genome nucleotide sequences that differ from those described herein due to the degeneracy of the genetic code are also provided.
  • identity when used in connection with sequence includes identity as determined by a number of different algorithms known in the art that can be used to measure nucleotide and/or amino acid sequence identity. In some embodiments described herein, identities are determined using a ClustalW v. 1.83 (slow) alignment employing an open gap penalty of 10.0, an extend gap penalty of 0.1, and using a Gonnet similarity matrix (MacVectorTM 10.0.2, MacVector Inc., 2008). The length of the sequences compared with respect to identity of sequences will depend upon the particular sequences. In various embodiments, identity is determined by comparing the sequence of a mature protein from its N-terminal to its C-terminal.
  • the human portion of the humanized sequence (but not the non-human portion) is used in making a comparison for the purpose of ascertaining a level of identity between a human sequence and a humanized sequence.
  • operably linked includes a juxtaposition wherein the components so described are in a relationship permitting them to function in their intended manner.
  • a nucleic acid sequence encoding a protein may be operably linked to regulatory sequences (e.g., promoter, enhancer, silencer sequence, etc.) so as to retain proper transcriptional regulation.
  • regulatory sequences e.g., promoter, enhancer, silencer sequence, etc.
  • various portions of the humanized protein of the invention may be operably linked to retain proper folding, processing, targeting, expression, and other functional properties of the protein in the cell. Unless stated otherwise, various domains of the humanized protein of the invention are operably linked to each other.
  • replacement in reference to gene replacement includes placing exogenous genetic material at an endogenous genetic locus, thereby replacing all or a portion of the endogenous gene with an orthologous or homologous nucleic acid sequence.
  • an endogenous non-human gene or fragment thereof is replaced with a corresponding human gene or fragment thereof.
  • a corresponding human gene or fragment thereof is a human gene or fragment that is an ortholog of, a homolog of, or is substantially identical or the same in structure and/or function, as the endogenous non-human gene or fragment thereof that is replaced.
  • nucleotide sequences encoding endogenous non-human CD3 extracellular domains were replaced by nucleotide sequences corresponding to human CD3 extracellular domains.
  • “Functional” as used herein, e.g., in reference to a functional protein, includes a protein that retains at least one biological activity normally associated with the native protein.
  • a replacement at an endogenous locus e.g., replacement at endogenous non-human CD3 loci results in a locus that fails to express a functional endogenous protein.
  • locus as in CD3 locus includes the genomic DNA comprising the CD3 coding region. Other sequences may be included in the CD3 locus that have been introduced for the purposes of genetic manipulation, e.g., selection cassettes, restriction sites, etc.
  • germline in reference to an immunoglobulin nucleic acid sequence includes a nucleic acid sequence that can be passed to progeny.
  • immunoglobulin molecule includes two immunoglobulin heavy chains and two immunoglobulin light chains.
  • the heavy chains may be identical or different, and the light chains may be identical or different.
  • antibody includes immunoglobulin molecules comprising four polypeptide chains, two heavy (H) chains and two light (L) chains inter-connected by disulfide bonds.
  • Each heavy chain comprises a heavy chain variable domain and a heavy chain constant region (C H ).
  • the heavy chain constant region comprises three domains, C H 1, C H 2 and C H 3.
  • Each light chain comprises a light chain variable domain and a light chain constant region (C L ).
  • the heavy chain and light chain variable domains can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR), interspersed with regions that are more conserved, termed framework regions (FR).
  • CDR complementarity determining regions
  • Each heavy and light chain variable domain comprises three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4 (heavy chain CDRs may be abbreviated as HCDR1, HCDR2 and HCDR3; light chain CDRs may be abbreviated as LCDR1, LCDR2 and LCDR3).
  • high affinity antibody refers to an antibody that has a K D with respect to its target epitope about of 10 ⁇ 9 M or lower (e.g., about 1 ⁇ 10 ⁇ 9 M, 1 ⁇ 10 ⁇ 10 M, 1 ⁇ 10 ⁇ 11 M, or about 1 ⁇ 10 ⁇ 12 M).
  • bispecific antibody includes an antibody capable of selectively binding two epitopes.
  • Bispecific antibodies generally comprise two arms, each binding a different epitope (e.g., two heavy chains with different specificies)—either on two different molecules (e.g., different epitopes on two different immunogens) or on the same molecule (e.g., different epitopes on the same immunogen). If a bispecific antibody is capable of selectively binding two different epitopes (a first epitope and a second epitope), the affinity of the first antibody arm for the first epitope will generally be at least one to two or three or four or more orders of magnitude lower than the affinity of the first antibody arm for the second epitope, and vice versa.
  • bispecific antibodies can be on the same or a different target (e.g., on the same or a different protein).
  • exemplary bispecific antibodies include those with a first antibody arm specific for a tumor antigen and a second antibody arm specific for a cytotoxic marker, e.g., an Fc receptor (e.g., Fc ⁇ RI, Fc ⁇ RII, Fc ⁇ RIII, etc.) or a T cell marker (e.g., CD3, CD28, etc.).
  • a cytotoxic marker e.g., an Fc receptor (e.g., Fc ⁇ RI, Fc ⁇ RII, Fc ⁇ RIII, etc.) or a T cell marker (e.g., CD3, CD28, etc.).
  • one arm of the bispecific antibody is specific for CD3.
  • a bispecific antibody with a first arm specific for a tumor antigen and a second arm specific for a toxin can be paired so as to deliver a toxin (e.g., saporin, vinca alkaloid, etc.) to a tumor cell.
  • exemplary bispecific antibodies include those with a first arm specific for an activating receptor (e.g., B cell receptor, Fc ⁇ RI, Fc ⁇ RIIA, Fc ⁇ RIIIA, Fc ⁇ RI, T cell receptor, etc.) and a second arm specific for an inhibitory receptor (e.g., Fc ⁇ RIIB, CD5, CD22, CD72, CD300a, etc.).
  • bispecific antibodies can be constructed for therapeutic conditions associated with cell activation (e.g., allergy and asthma).
  • Bispecific antibodies can be made, for example, by combining heavy chains that recognize different epitopes of the same immunogen.
  • nucleic acid sequences encoding heavy chain variable sequences that recognize different epitopes of the same immunogen can be fused to nucleic acid sequences encoding the same or different heavy chain constant regions, and such sequences can be expressed in a cell that expresses an immunoglobulin light chain.
  • a typical bispecific antibody has two heavy chains each having three heavy chain CDRs, followed by (N-terminal to C-terminal) a C H 1 domain, a hinge, a C H 2 domain, and a C H 3 domain, and an immunoglobulin light chain that either does not confer epitope-binding specificity but that can associate with each heavy chain, or that can associate with each heavy chain and that can bind one or more of the epitopes bound by the heavy chain epitope-binding regions, or that can associate with each heavy chain and enable binding of one or both of the heavy chains to one or both epitopes.
  • the phrase “multispecific antibody” includes an antibody capable of selectively binding multiple epitopes (e.g., two, three, four epitopes).
  • CDR complementarity determining region
  • a CDR includes an amino acid sequence encoded by a nucleic acid sequence of an organism's immunoglobulin genes that normally (i.e., in a wild-type animal) appears between two framework regions in a variable region of a light or a heavy chain of an immunoglobulin molecule.
  • a CDR can be encoded by, for example, a germline sequence or a rearranged or unrearranged sequence, and, for example, by a naive or a mature B cell.
  • a CDR can be somatically mutated (e.g., vary from a sequence encoded in an animal's germline), humanized, and/or modified with amino acid substitutions, additions, or deletions.
  • CDRs can be encoded by two or more sequences (e.g., germline sequences) that are not contiguous (e.g., in an unrearranged nucleic acid sequence) but are contiguous in a B cell nucleic acid sequence, e.g., as the result of splicing or connecting the sequences (e.g., V-D-J recombination to form a heavy chain CDR3).
  • sequences e.g., germline sequences
  • a B cell nucleic acid sequence e.g., as the result of splicing or connecting the sequences (e.g., V-D-J recombination to form a heavy chain CDR3).
  • the phrase “functional fragment” includes fragments of antigen-binding proteins such as antibodies that can be expressed, secreted, and specifically bind to an epitope with a K D in the micromolar, nanomolar, or picomolar range. Specific recognition includes having a K D that is at least in the micromolar range, the nanomolar range, or the picomolar range.
  • heavy chain or “immunoglobulin heavy chain” includes an immunoglobulin heavy chain sequence, including immunoglobulin heavy chain constant region sequence, from any organism.
  • Heavy chain variable domains include three heavy chain CDRs and four FR regions, unless otherwise specified. Fragments of heavy chains include CDRs, CDRs and FRs, and combinations thereof.
  • a typical heavy chain has, following the variable domain (from N-terminal to C-terminal), a C H 1 domain, a hinge, a C H 2 domain, and a C H 3 domain.
  • a functional fragment of a heavy chain includes a fragment that is capable of specifically recognizing an epitope (e.g., recognizing the epitope with a K D in the micromolar, nanomolar, or picomolar range), that is capable of expressing and secreting from a cell, and that comprises at least one CDR.
  • a heavy chain variable domain is encoded by a variable region gene sequence, which generally comprises V H , D H , and J H segments derived from a repertoire of V H , D H , and J H segments present in the germline. Sequences, locations and nomenclature for V, D, and J heavy chain segments for various organisms can be found on the website for the International Immunogenetics Information System (IMGT database).
  • IMGT database International Immunogenetics Information System
  • light chain includes an immunoglobulin light chain sequence from any organism, and unless otherwise specified includes human kappa and lambda light chains and a VpreB, as well as surrogate light chains.
  • Light chain variable domains typically include three light chain CDRs and four framework (FR) regions, unless otherwise specified.
  • FR framework
  • a full-length light chain includes, from amino terminus to carboxyl terminus, a variable domain that includes FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4, and a light chain constant region.
  • a light chain variable domain is encoded by a light chain variable region gene sequence, which generally comprises V L and J L segments, derived from a repertoire of V and J segments present in the germline.
  • Light chains include those, e.g., that do not selectively bind any epitopes recognized by antigen-binding protein (e.g., antibody) in which they appear. Light chains also include those that bind and recognize, or assist the heavy chain with binding and recognizing, one or more epitopes selectively bound by the antigen-binding protein (e.g., an antibody) in which they appear.
  • antigen-binding protein e.g., antibody
  • antigen-binding protein includes antibodies and various naturally produced and engineered molecules capable of binding the antigen of interest. Such include, e.g., domain-specific antibodies, single domain antibodies (e.g., derived from camelids and fish, etc.), domain-deleted antibodies, chimeric antibodies, CDR-grafted antibodies, diabodies, triabodies, tetrabodies, minibodies, nanabodies (e.g., monovalent nanobodies, bivalent nanobodies, etc.), small modular immunopharmaceuticals (SMIPs), shark variable IgNAR domains, etc.
  • domain-specific antibodies e.g., single domain antibodies (e.g., derived from camelids and fish, etc.), domain-deleted antibodies, chimeric antibodies, CDR-grafted antibodies, diabodies, triabodies, tetrabodies, minibodies, nanabodies (e.g., monovalent nanobodies, bivalent nanobodies, etc.), small modular immunopharmaceuticals (SMIP
  • Antigen-binding protein may also include antigen-binding fragments such as, e.g., (i) Fab fragments; (ii) F(ab′)2 fragments; (iii) Fd fragments; (iv) Fv fragments; (v) single-chain Fv (scFv) molecules; (vi) dAb fragments; and (vii) minimal recognition units consisting of the amino acid residues that mimic the hypervariable region of an antibody (e.g., an isolated complementarity determining region (CDR) such as a CDR3 peptide), etc.
  • CDR complementarity determining region
  • cell includes any cell that is suitable for expressing a recombinant nucleic acid sequence.
  • Cells include those of prokaryotes and eukaryotes (single-cell or multiple-cell), bacterial cells (e.g., strains of E. coli, Bacillus spp., Streptomyces spp., etc.), mycobacteria cells, fungal cells, yeast cells (e.g., S. cerevisiae, S. pombe, P. pastoris, P.
  • the cell is a human, monkey, ape, hamster, rat, or mouse cell.
  • the cell is eukaryotic and is selected from the following cells: CHO (e.g., CHO K1, DXB-11 CHO, Veggie-CHO), COS (e.g., COS-7), retinal cell, Vero, CV1, kidney (e.g., HEK293, 293 EBNA, MSR 293, MDCK, HaK, BHK), HeLa, HepG2, WI38, MRC 5, Colo205, HB 8065, HL-60, (e.g., BHK21), Jurkat, Daudi, A431 (epidermal), CV-1, U937, 3T3, L cell, C127 cell, SP2/0, NS-0, MMT 060562, Sertoli cell, BRL 3A cell, HT1080 cell, myeloma cell, tumor cell, and a cell line derived from an aforementioned cell.
  • the cell comprises one or more viral genes, e.g. a retinal cell that expresses a viral gene
  • the present invention provides genetically modified non-human animals (e.g., rodents, e.g., mice or rats) that comprise in their genome (e.g., in their germline genome) a nucleic acid sequence encoding a humanized CD3 protein (e.g., a humanized CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , or combination thereof).
  • the present invention provides genetically modified non-human animals (e.g., rodents, e.g., mice or rats) that comprise in their genome nucleotide sequences encoding humanized CD3 ⁇ , humanized CD3 ⁇ , and humanized CD3 ⁇ proteins.
  • the mouse expresses a humanized CD3 ⁇ complex on the surface of its T cells such that the humanized CD3 ⁇ forms a complex with the T cell receptor expressed on the same T cell.
  • CD3 molecule is commonly a target of agents that are aimed at modulating T cell immunity, and several anti-CD3 antibodies have been developed for that purpose (e.g., muromonab-CD3 or OKT3).
  • Anti-CD3 antibodies such as OKT3 are used as immunosuppressive agents (e.g., in transplant rejection) but are also studied for their therapeutic potential in autoimmune diseases (e.g., Crohn's disease, type I diabetes, ulcerative colitis, etc.).
  • CD3 molecules are also being studied as targets for bispecific agents, e.g., bispecific antibodies, because of the ability of anti-CD3 bispecific antibodies to recruit T cells to a target cell, e.g., a cell that expresses a particular antigen of interest.
  • bispecific agents e.g., bispecific antibodies
  • Exemplary anti-CD3 bispecific antibodies are described in U.S. Patent Application Publication No. 2014/0088295, and US. Patent Application No. 62/033,460 (filed Aug. 5, 2014), both incorporated herein by reference.
  • candidate agents are typically studied based on their efficacy, toxicity, and other pharmacokinetic and pharmacodynamics properties.
  • Candidate agents such as antibodies, typically target a human antigen—as the end goal of investigation is to develop a human therapy.
  • Many preclinical studies are conducted in large animals such as primates as their physiology and drug metabolism are most similar to humans.
  • Several antibodies developed to CD3 e.g., OKT3 are known not to cross-react to non-human CD3, particularly to primate CD3.
  • OKT3 antibodies developed to CD3
  • the drug candidate must be determined to recognize primate CD3 molecule.
  • a separate factor complicating development of anti-CD3 therapy is that large primates such as chimpanzees are endangered and in many countries studies in chimpanzees are prohibited; while studies in other primates, e.g., cynomolgus monkeys ( Macaca fascicularis ), may raise ethical concerns.
  • any preliminary data on a specific therapeutic candidate that can be obtained in a smaller animal model, such as a rodent, e.g., a mouse can be helpful in determining further progress of preclinical investigations in large primates.
  • the most useful small animal model to conduct preliminary studies is a non-human animal, e.g., a rodent, that expresses a human or humanized CD3 protein, and allows the testing of anti-CD3 drug candidates that also cross-react with cynomolgus monkey CD3, allowing for subsequent primate preclinical studies.
  • the present invention provides such an intricate animal model.
  • the CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof. In some embodiments, the CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof. In some embodiments, the CD3 protein comprises CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ polypeptide chains.
  • the genetically modified non-human animal comprises in its genome a nucleic acid sequence(s) encoding an extracellular domain of a human a CD3 ⁇ , an extracellular domain of a human CD3 ⁇ , and an extracellular domain of a human CD3 ⁇ .
  • the extracellular domains of human CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ may be encoded by a single nucleic acid.
  • the extracellular domains of human CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ are encoded by separate nucleic acids.
  • Exemplary CD3 proteins are presented in the alignment in FIG. 4 .
  • a mouse CD3 ⁇ protein sequence can be found in GenBank Accession Number NP_031674 and SEQ ID NO:27, while a human CD3 ⁇ protein sequence can be found in GenBank Accession Number NP_000724 and SEQ ID NO:28.
  • a mouse CD3 ⁇ protein sequence can be found in GenBank Accession Number NP_038515 and SEQ ID NO:29, while a human CD ⁇ protein sequence can be found in GenBank Accession Number NP_000723 and SEQ ID NO:30.
  • a mouse CD3 ⁇ protein sequence can be found in GenBank Accession Number NP_033980 and SEQ ID NO:31, while a human CD3 ⁇ protein sequence can be found in GenBank Accession Number NP_000064 and SEQ ID NO:32.
  • the nucleic acid sequence(s) encoding an extracellular domain of a human CD3, e.g., an extracellular domain of a human a CD3 ⁇ , human CD3 ⁇ , and human CD3 ⁇ are located at an endogenous non-human CD3 locus.
  • the non-human animal does not comprise a functional extracellular domain of the corresponding non-human CD3 protein.
  • the nucleic acid sequence(s) encoding an extracellular domain of a human CD3 replaces corresponding nucleic acid sequence(s) encoding endogenous non-human CD3.
  • the nucleic acid sequence encoding the extracellular domain of a human CD3 ⁇ replaces the nucleic acid sequence encoding the extracellular domain of endogenous non-human CD3 ⁇
  • the nucleic acid sequence encoding the extracellular domain of a human CD3 ⁇ replaces the nucleic acid sequence encoding the extracellular domain of endogenous non-human CD3 ⁇
  • the nucleic acid sequence encoding the extracellular domain of a human CD3 ⁇ replaces the nucleic acid sequence encoding the extracellular domain of endogenous non-human CD3 ⁇ .
  • the replacement does not comprise the replacement of a nucleic acid sequence encoding endogenous signal sequence.
  • the replacement comprises the replacement of the nucleic acid sequence encoding endogenous signal sequence with the nucleic acid sequence encoding a human signal sequence.
  • the extracellular domain comprises the region of the protein(s) that is not a transmembrane or a cytoplasmic domain, e.g., the region of the protein that appears on the surface of the cell and that, in part, when assembled in a complex interacts with the extracellular domains of other components of TCR signaling complex, e.g., TCR alpha and beta extracellular domains.
  • extracellular domain refers to the domain of the protein expressed on the cell surface and, unless indicated otherwise, does not include the signal sequence which is typically proteolytically cleaved prior to sell surface expression.
  • the extracellular domain of CD3 ⁇ comprises amino acids 17-130 of the amino acid sequence set forth in SEQ ID NO:24 (set forth separately as SEQ ID NO:33).
  • the animal comprises the nucleic acid sequence encoding an endogenous CD3 ⁇ signal sequence, e.g., signal sequence at amino acids 1-16 of SEQ ID NO:24.
  • the animal comprises the nucleic acid sequence encoding a human CD3 ⁇ signal sequence.
  • the extracellular domain of CD3 ⁇ comprises amino acids 19-105 of the amino acid sequence set forth in SEQ ID NO:25 (set forth separately as SEQ ID NO:34).
  • the animal comprises the nucleic acid sequence encoding an endogenous CD3 ⁇ signal sequence, e.g., signal sequence at amino acids 1-18 of SEQ ID NO:25. In other embodiments of the invention, the animal comprises the nucleic acid sequence encoding a human CD3 ⁇ signal sequence. In some embodiments, the extracellular domain of CD3 ⁇ comprises amino acids 20-116 of the amino acid sequence set forth in SEQ ID NO:26 (set forth separately as SEQ ID NO:35). In some such embodiments, the animal comprises the nucleic acid sequence encoding endogenous CD3 ⁇ signal sequence, e.g., signal sequence at amino acids 1-19 of SEQ ID NO:26. In other embodiments of the invention, the animal comprises the nucleic acid sequence encoding a human CD3 ⁇ signal sequence.
  • the non-human animal comprises a nucleic acid sequence encoding transmembrane and cytoplasmic domains of endogenous CD3 protein, e.g., corresponding endogenous CD3 protein.
  • the non-human animal comprises a nucleic acid sequence encoding the extracellular domain of the human CD3 protein operably linked to the nucleic acid sequence encoding transmembrane and cytoplasmic domains of the corresponding endogenous non-human CD3 protein.
  • the animal comprises at an endogenous CD3 locus a nucleic acid sequence(s) encoding an extracellular domain of a human CD3 protein operably linked to a nucleic acid sequence(s) encoding transmembrane and cytoplasmic domains of an endogenous non-human CD3.
  • the animal comprises at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ , at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ , and at an endogenous CD3 ⁇ locus a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ operably linked to a nucleic acid sequence encoding transmembrane and cytoplasmic domains of an endogenous non-human animal CD3 ⁇ .
  • the non-human animal expresses extracellular domains of human CD3 protein. In some aspects, the non-human animal expresses an extracellular domain of human CD3 ⁇ set forth in SEQ ID NO:33. In some aspects, the non-human animal expresses an extracellular domain of human CD3 ⁇ set forth in SEQ ID N0:34. In some aspects, the non-human animal expresses an extracellular domain of human CD3 ⁇ set forth in SEQ ID NO:35.
  • the non-human animal is a mammal.
  • the non-human animal is a small mammal, e.g., of the superfamily Dipodoidea or Muroidea.
  • the genetically modified animal is a rodent.
  • the rodent is selected from a mouse, a rat, and a hamster.
  • the rodent is selected from the superfamily Muroidea.
  • the genetically modified animal is from a family selected from Calomyscidae (e.g., mouse-like hamsters), Cricetidae (e.g., hamster, New World rats and mice, voles), Muridae (true mice and rats, gerbils, spiny mice, crested rats), Nesomyidae (climbing mice, rock mice, white-tailed rats, Malagasy rats and mice), Platacanthomyidae (e.g., spiny dormice), and Spalacidae (e.g., mole rats, bamboo rats, and zokors).
  • Calomyscidae e.g., mouse-like hamsters
  • Cricetidae e.g., hamster, New World rats and mice, voles
  • Muridae true mice and rats, gerbils, spiny mice, crested rats
  • Nesomyidae climbing mice, rock mice,
  • the genetically modified rodent is selected from a true mouse or rat (family Muridae), a gerbil, a spiny mouse, and a crested rat.
  • the genetically modified mouse is from a member of the family Muridae.
  • the animal is a rodent.
  • the rodent is selected from a mouse and a rat.
  • the non-human animal is a mouse.
  • the non-human animal is a rodent that is a mouse of a C57BL strain selected from C57BL/A, C57BL/An, C57BL/GrFa, C57BL/KaLwN, C57BL/6, C57BL/6J, C57BL/6ByJ, C57BL/6NJ, C57BL/10, C57BL/10ScSn, C57BL/10Cr, and C57BL/Ola.
  • a C57BL strain selected from C57BL/A, C57BL/An, C57BL/GrFa, C57BL/KaLwN, C57BL/6, C57BL/6J, C57BL/6ByJ, C57BL/6NJ, C57BL/10, C57BL/10ScSn, C57BL/10Cr, and C57BL/Ola.
  • the mouse is a 129 strain selected from the group consisting of a strain that is 129P1, 129P2, 129P3, 129X1, 129S1 (e.g., 12951/SV, 129S1/SvIm), 129S2, 129S4, 129S5, 129S9/SvEvH, 129S6 (129/SvEvTac), 129S7, 129S8, 129T1, 129T2 (see, e.g., Festing et al.
  • the genetically modified mouse is a mix of an aforementioned 129 strain and an aforementioned C57BL/6 strain.
  • the mouse is a mix of aforementioned 129 strains, or a mix of aforementioned BL/6 strains.
  • the 129 strain of the mix is a 129S6 (129/SvEvTac) strain.
  • the mouse is a BALB strain, e.g., BALB/c strain.
  • the mouse is a mix of a BALB strain and another aforementioned strain.
  • the non-human animal is a rat.
  • the rat is selected from a Wistar rat, an LEA strain, a Sprague Dawley strain, a Fischer strain, F344, F6, and Dark Agouti.
  • the rat strain is a mix of two or more strains selected from the group consisting of Wistar, LEA, Sprague Dawley, Fischer, F344, F6, and Dark Agouti.
  • the genetically modified non-human animal is a rodent.
  • the genetically modified non-human animal is a rat or a mouse.
  • the animal is a mouse.
  • the genetically modified animal is a mouse and the mouse comprises at an endogenous mouse CD3 locus a nucleotide sequence encoding an extracellular domain of a human CD3 protein.
  • the mouse comprises a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ , a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ , and a nucleic acid sequence encoding an extracellular domain of a human CD3 ⁇ .
  • the extracellular domain of the human CD3 ⁇ comprises the sequence set forth in SEQ ID NO:33
  • the extracellular domain of the human CD3 ⁇ comprises the sequence set forth in SEQ ID NO:34
  • the extracellular domain of the human CD3 ⁇ comprises the sequence set forth in SEQ ID NO:35.
  • the mouse comprises the sequence(s) encoding endogenous mouse CD3 signal sequence(s). In other embodiments, the mouse comprises the sequence(s) encoding human CD3 signal sequence(s).
  • the mouse of the invention expresses humanized CD3 protein(s). In one embodiment, the mouse expresses humanized CD3 ⁇ , humanized CD3 ⁇ , and humanized CD3 ⁇ proteins. In some embodiments of the invention, the mouse expresses a human CD3 ⁇ extracellular domain and endogenous mouse CD3 ⁇ transmembrane and cytoplasmic domains, a human CD3 ⁇ extracellular domain and endogenous mouse CD3 ⁇ transmembrane and cytoplasmic domains, and a human CD3 ⁇ extracellular domain and endogenous mouse CD3 ⁇ transmembrane and cytoplasmic domains.
  • the mouse expresses humanized CD3 proteins wherein the humanized CD3 proteins are humanized CD3 ⁇ set forth in SEQ ID NO:24, humanized CD3 ⁇ set forth in SEQ ID NO:25, and humanized CD3 ⁇ set forth in SEQ ID NO:26.
  • the genetically engineered mouse is an immunocompetent mouse.
  • the introduction of humanized CD3 protein(s) does not affect the mouse's immune system function.
  • the mouse comprises normal T and B cell ratio.
  • the mouse is capable of mounting a normal response to mouse infection.
  • the mouse displays similar CD4+ to CD8+ cell ratio in the thymus as compared to a wild type mouse, e.g., a mouse that has not been genetically modified to express humanized CD3 protein(s).
  • the CD4+ to CD8+ cell ratio in the thymus of the mouse is within 30%, e.g., within 20%, e.g., within 15%, e.g., within 12%, e.g., within 10%, e.g., within 5%, e.g., within 2%, of the CD4+ to CD8+ cell ratio of a mouse that is not genetically modified to express humanized CD3 protein(s).
  • the mouse displays similar T and B cell percentages in the spleen, lymph nodes, and peripheral blood as a wild type mouse, e.g., a mouse that is not genetically modified to express humanized CD3 protein(s).
  • the mouse displays similar numbers of circulating white blood cells, lymphocytes, monocytes, neutrophils, eosinophils, and basophils as a wild type mouse, e.g., a mouse that is not genetically modified to express humanized CD3 protein(s).
  • the method of making a genetically modified non-human animal wherein the animal expresses a humanized CD3 protein comprises placing at an endogenous non-human animal CD3 locus a nucleic acid sequence encoding an extracellular domain of a human CD3 protein, wherein the human CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof. In one embodiment the animal does not comprise a functional extracellular domain of the corresponding non-human CD3 protein(s).
  • the animal comprises at an endogenous non-human CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 ⁇ , an extracellular domain of human CD3 ⁇ , and an extracellular domain of human CD3 ⁇ .
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:33
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO: 34
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:35.
  • the animal does not comprise a functional extracellular domain of the corresponding non-human CD3 protein(s).
  • the method of making a genetically modified non-human animal of the invention comprises replacing at the endogenous CD3 locus a nucleotide sequence encoding the extracellular domain of a non-human CD3 protein(s) with a nucleotide sequence encoding an extracellular domain of a corresponding human CD3 protein(s).
  • the animal retains transmembrane and cytoplasmic domains of the non-human CD3 protein(s).
  • the replacement results in a chimeric protein(s) comprising an extracellular domain of a human CD3 protein(s) and transmembrane and cytoplasmic domains of corresponding endogenous non-human CD3 protein(s).
  • the replacement method utilizes a targeting construct made using VELOCIGENE® technology, introducing the construct into ES cells, and introducing targeted ES cell clones into a mouse embryo using VELOCIMOUSE® technology, as described in the Examples.
  • the method comprises the replacement of the nucleotide sequence encoding the extracellular domain of endogenous non-human CD3 ⁇ with the nucleotide sequence encoding the extracellular domain of a human CD3 ⁇ protein
  • the method comprises a replacement of partial sequence of endogenous mouse coding exons 2 to 4 of mouse CD3 ⁇ gene with partial sequence of human coding exons 2 to 5 of human CD3 ⁇ gene.
  • the method comprises the replacement of the nucleotide sequence encoding the extracellular domain of endogenous non-human CD3 ⁇ with the nucleotide sequence encoding the extracellular domain of a human CD3 ⁇
  • the method comprises a replacement of partial sequence of endogenous mouse coding exons 2 to 3 of mouse CD3 ⁇ with the partial sequence of human coding exons 2 to 3 of human CD3 ⁇ gene.
  • the method comprises a replacement of the nucleotide sequence encoding the extracellular domain of endogenous non-human CD3 ⁇ with the nucleotide sequence encoding the extracellular domain of human CD3 ⁇
  • the method comprises replacement of partial sequence of mouse coding exons 2 to 4 of mouse CD3 ⁇ with the partial sequence of human coding exons 2 to 4 of human CD3 ⁇ gene.
  • the replacement comprises the replacement of sequence of CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ .
  • the replacement may be accomplished by creating a large targeting vector that incorporates the sequential genetic modification in all three loci and then introducing the large targeting vector into mouse ES cells to make a mouse, e.g., as described in Example 1.
  • the large targeting vector comprises 5′ and 3′ mouse homology arms; a DNA fragment comprising the CD3 ⁇ gene which comprises a replacement of partial sequence of mouse CD3 ⁇ coding exons 2 to 4 with partial sequence of human CD3 ⁇ coding exons 2 to 5; a DNA fragment comprising the CD3 ⁇ gene which comprises a replacement of partial sequence of mouse CD3 ⁇ coding exons 2 to 3 with partial sequence of human CD3 ⁇ coding exons 2 to 3; a DNA fragment comprising the CD3 ⁇ gene which comprises a replacement of partial sequence of mouse CD3 ⁇ coding exons 2 to 4 with partial sequence of human CD3 ⁇ coding exons 2 to 4; and a selection cassette.
  • a selection cassette is a nucleotide sequence inserted into a targeting construct to facilitate selection of cells (e.g., bacterial cells, ES cells) that have integrated the construct of interest.
  • cells e.g., bacterial cells, ES cells
  • a number of suitable selection cassettes are known in the art (Neo, Hyg, Pur, CM, SPEC, etc.).
  • a selection cassette may be flanked by recombination sites, which allow deletion of the selection cassette upon treatment with recombinase enzymes. Commonly used recombination sites are loxP and Frt, recognized by Cre and Flp enzymes, respectively, but others are known in the art.
  • a selection cassette may be located anywhere in the construct outside the coding region. In one embodiment, the selection cassette is inserted upstream of human CD3 ⁇ inserted sequence.
  • ES cells or genetically modified non-human animals are screened to confirm successful incorporation of exogenous nucleotide sequence of interest or expression of exogenous polypeptide.
  • Numerous techniques are known to those skilled in the art, and include (but are not limited to) Southern blotting, long PCR, quantitative PCR (e.g., real-time PCR using TAQMAN®), fluorescence in situ hybridization, Northern blotting, flow cytometry, Western analysis, immunocytochemistry, immunohistochemistry, etc.
  • non-human animals e.g., mice bearing the genetic modification of interest can be identified by screening for loss of mouse allele and/or gain of human allele using a modification of allele assay described in Valenzuela et al.
  • a method for making a chimeric human/non-human CD3 molecule comprising expressing in a single cell a chimeric CD3 protein from a nucleotide construct as described herein.
  • the nucleotide construct is a viral vector; in a specific embodiment, the viral vector is a lentiviral vector.
  • the cell is selected from a CHO, COS, 293, HeLa, and a retinal cell expressing a viral nucleic acid sequence (e.g., a PERC.6TM cell).
  • a cell that expresses a chimeric human/non-human CD3 protein comprises an expression vector comprising a chimeric CD3 sequence as described herein.
  • the cell is selected from CHO, COS, 293, HeLa, and a retinal cell expressing a viral nucleic acid sequence (e.g., a PERC.6TM cell).
  • a chimeric CD3 molecule made by a non-human animal as described herein is also provided, wherein, in one embodiment, the chimeric CD3 molecule comprises an amino acid sequence of all or substantially all of an extracellular domain of a human CD3 protein, and at least transmembrane and cytoplasmic domains from a non-human CD3 protein, e.g., mouse CD3 protein.
  • a non-human embryo e.g., a rodent, e.g., a mouse or a rat embryo
  • the embryo comprises a donor ES cell that is derived from a non-human animal (e.g., a rodent, e.g., a mouse or a rat) as described herein.
  • the embryo comprises an ES donor cell that comprises the chimeric CD3 gene, and host embryo cells.
  • tissue wherein the tissue is derived from a non-human animal (e.g., a rodent, e.g., a mouse or a rat) as described herein, and expresses the chimeric CD3 protein.
  • a non-human animal e.g., a rodent, e.g., a mouse or a rat
  • a non-human cell isolated from a non-human animal as described herein is provided.
  • the cell is an ES cell.
  • the cell is a T cell.
  • the cell is a CD8+ T cell.
  • the cell is a CD4+ T cell.
  • genetic loci comprising the nucleic acid sequences that encoding the humanized CD3 protein(s) described herein.
  • provided herein is a mouse model for testing CD3-targeted (“anti-CD3”) therapeutic agents.
  • a mouse model for testing anti-CD3 antigen-binding proteins In some embodiments, provided herein is a mouse model for testing anti-CD3 antibodies.
  • a mouse model for testing anti-CD3 multispecific, e.g. bispecific antigen-binding proteins or anti-CD3 bispecific antibodies As such, an anti-CD3 multispecific antigen-binding protein, e.g. an anti-CD3 bispecific antigen-binding protein, targets or specifically binds said humanized CD3 protein and at least one other antigen of interest.
  • the mouse model for testing anti-CD3 bispecific antigen-binding proteins wherein the antigen-binding protein is capable of binding both CD3 and the antigen of interest comprises a nucleic acid sequence encoding a humanized CD3 protein, wherein the humanized CD3 protein is selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof, and a cell expressing or comprising the antigen of interest.
  • the mouse comprises a T cell expressing said humanized CD3 protein(s).
  • the testing of the monospecific or bispecific antigen-binding protein involves performing an assay or a study that allows determination of the effect of the antigen-binding protein on the T cell expressing said humanized CD3 protein.
  • the testing of the bispecific antigen-binding protein involves performing an assay or a study that allows determination of the effect of the antigen-binding protein on both the T cell expressing said humanized CD3 protein and the cell expressing or comprising the antigen of interest, or the interaction between said CD3-expressing T cell and the cell expressing or comprising the antigen of interest.
  • the testing of the monospecific or bispecific antigen-binding protein involves performing an assay or a study that allows determination of the effect of the T cell expressing said humanized CD3 protein on the cell expressing or comprising said antigen of interest.
  • assay measures e.g., the number of cells expressing the antigen of interest, immune response, cellular interactions, cellular cytotoxicity, cytokine release, cellular activation, cell proliferation, tumor growth or regression, changes in pathology, or the like.
  • Various assays include but are not limited to measurements of complement-directed cytotoxicity (CDC), antibody-dependent cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), PBMC proliferation, CD69 activation, histological tissue analysis, analysis of tissue and cellular biomarkers (e.g., cells or tissue may be extracted from the mouse for the purpose of the assays, or analyzed by radiography, MRI, PET, SPECT, BLI, and fluorescence-based imaging modalities).
  • CDC complement-directed cytotoxicity
  • ADCC antibody-dependent cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • PBMC proliferation e.g., CD69 activation
  • histological tissue analysis e.g., cells or tissue may be extracted from the mouse for the purpose of the assays, or analyzed by radiography, MRI, PET, SPECT, BLI, and fluorescence-based imaging modalities.
  • the antigen of interest in such a mouse model, has been introduced into said mouse.
  • the antigen of interest may be introduced by several methods known to those skilled in the art. Some nonlimiting methods include transgenesis, injection, infection, tissue or cell transplantation.
  • the antigen of interest or a fragment thereof e.g., a fragment that is recognized by the antigen-binding protein being tested
  • the antigen of interest is a humanized antigen of interest encoded by the mouse genome.
  • the antigen of interest may be a membrane-bound protein such that it is expressed only on cell surface.
  • the antigen of interest or a fragment thereof e.g., a fragment that is recognized by the antigen-binding protein being tested
  • Some cell-surface antigens may associate with other proteins as co-receptor complexes, or bind or have affinity to extracellular molecules.
  • the mouse model may be utilized to test bispecific antigen-binding molecules that interact with T cells in various cell systems.
  • the mouse model expresses human CD3 ⁇ , CD3 ⁇ , CD3 ⁇ extracellular domains.
  • the mouse expresses mouse transmembrane and cytoplasmic domain of CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ ; an in one embodiment, the transmembrane and cytoplasmic domains are endogenous mouse domains.
  • the mouse model expresses CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ , each comprising a human extracellular domain and mouse, e.g., endogenous mouse, transmembrane and cytoplasmic domains.
  • the antigen-binding protein binds both CD3 and the antigen of interest in the mouse model.
  • the antigen of interest is a human antigen.
  • the antigen of interest is a primate antigen, e.g., a cynomolgus monkey antigen.
  • the antigen-binding protein is capable of binding the same antigen of interest of both human and monkey origin.
  • the antigen-binding protein is capable of binding both human and monkey CD3.
  • the mouse model comprises a xenograft of a tumor expressing the antigen of interest.
  • the cell expressing or comprising the antigen of interest in said mouse is an immortalized cell, such as a tumor cell.
  • the mouse model is utilized to test the activity of anti-CD3 bispecific antigen-binding proteins in blocking or affecting the tumor cell expressing the antigen of interest.
  • the antigen of interest may be a tumor-associated antigen (TAA).
  • TAA tumor-associated antigen
  • Various tumor antigens are listed in the database of T cell defined tumor antigens (van der Bruggen P, Stroobant V, Vigneron N, Van den Eynde B. Peptide database: T cell-defined tumor antigens. Cancer Immun 2013).
  • Exemplary tumor associated antigens include but are not limited to AFP, ALK, BAGE proteins, ⁇ -catenin, brc-abl, BRCA1, BORIS, CA9, carbonic anhydrase IX, caspase-8, CCR5, CD19, CD20, CD30, CD40, CDK4, CEA, CTLA4, cyclin-B1, CYP1B1, EGFR, EGFRvIII, ErbB2/Her2, ErbB3, ErbB4, ETV6-AML, EpCAM, EphA2, Fra-1, FOLR1, GAGE protein, GD2, GD3, GloboH, glypican-3, GM3, gp100, Her2, HLA/B-raf, HLA/k-ras, HLA/MAGE-A3, hTERT, LMP2, MAGE protein, MART-1, mesothelin, ML-IAP, Muc1, Muc2, Muc3, Muc4, Muc5, Muc16 (CA-125), MUM1, NA17
  • the mouse model is used to determine if a candidate bispecific antigen-binding protein is capable of blocking or affecting an antigen of interest which is an infectious disease associated antigen.
  • the mouse is infected with an infectious agent.
  • the infectious disease associated antigen is a viral antigen.
  • the viral antigen is selected from the group consisting of HIV, hepatitis A, hepatitis B, hepatitis C, herpes virus (e.g., HSV-1, HSV-2, CMV, HAV-6, VZV, Epstein Barr virus), adenovirus, influenza virus, flavivirus, echovirus, rhinovirus, coxsackie virus, coronavirus, respiratory syncytial virus, mumps virus, rotavirus, measles virus, rubella virus, parvovirus, vaccinia virus, HTLV, dengue virus, papillomavirus, molluscum virus, poliovirus, rabies virus, JC virus, ebola virus, and arboviral encephalitis virus antigen.
  • herpes virus e.g., HSV-1, HSV-2, CMV, HAV-6, VZV, Epstein Barr virus
  • adenovirus e.g., HSV-1, HSV-2, CMV, HAV
  • the antigen of interest is an infectious disease associated antigen
  • the antigen of interest is a bacterial antigen.
  • the bacterial antigen is selected from the group consisting of chlamydia, rickettsia, mycobacteria, staphylococci, streptococci, pneumonococci, meningococci, gonococci, klebsiella, proteus, serratia, pseudomonas, legionella, diphtheria, salmonella, bacilli, cholera, tetanus, botulism, anthrax, plague, leptospira, and Lyme disease bacterial antigen.
  • the CD3-based bispecific antigen binding protein is a human CD3 based antigen binding protein.
  • the antigen binding protein is an antibody, e.g., a human antibody, or an antigen-binding fragment thereof.
  • the mouse model is an immunocompetent mouse model.
  • the mouse model allows for testing of efficacy and/or toxicity of an antigen-binding protein of interest.
  • the measures of efficacy will depend on the antigen of interest being targeted by the bispecific agent.
  • the measure of efficacy is T cell killing of the cell expressing the antigen.
  • the measure of efficacy is neutralization of the virus.
  • the measure of efficacy may be viability of the animal.
  • the measure of efficacy may be elimination of cells expressing the antigen of interest, proliferation of T cells, production of cytokines (e.g., IFNg, TNFa, IL-1, IL-2, IL-10, IL4, IL-6, granzyme, perforin, etc.)
  • cytokines e.g., IFNg, TNFa, IL-1, IL-2, IL-10, IL4, IL-6, granzyme, perforin, etc.
  • the toxicity in the animal may be measured as an adverse event in the animal, e.g., change in body weight, appetite, digestive changes, changes in blood cell counts, splenomegaly, histological changes of the organs, change in liver enzyme function, changes in urinalysis, organ toxicity, hemorrhage, dehydration, loss of fur and scruffiness, or other signs of morbidity.
  • One measure may be determination of antigen-binding protein cross-reactivity with irrelevant antigens, which, in one embodiment, can be detected by organ histology, specifically detection of antigen-binding protein in tissues or cell types that are not known to express the antigen of interest.
  • the invention also provides various methods of using the genetically modified non-human animals described herein.
  • a method of screening therapeutic drug candidates that target an antigen of interest comprising (a) providing or receiving a genetically modified mouse comprising at its endogenous mouse CD3 locus a nucleic acid sequence encoding an extracellular domain of a human CD3 protein selected from the group consisting of CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , CD3 ⁇ , and a combination thereof, (b) introducing into said genetically modified mouse an antigen of interest, (c) contacting said mouse with a drug candidate of interest, wherein the drug candidate is directed against the human CD3 and the antigen of interest, and (d) determining if the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest.
  • the mouse expresses a functional humanized CD3 protein on the surface of its T cells.
  • the genetically modified mouse comprises at the endogenous mouse CD3 locus a nucleic acid sequence encoding an extracellular domain of human CD3 ⁇ , an extracellular domain of human CD3 ⁇ , and an extracellular domain of human CD3 ⁇ .
  • the mouse does not comprise the nucleic acid sequence encoding a functional extracellular domain of the corresponding mouse protein.
  • the extracellular domain(s) of the human CD3 protein(s) is operably linked to the transmembrane and cytoplasmic domain(s) of the corresponding endogenous mouse CD3 protein(s).
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:33
  • the extracellular domain of a human CD3 ⁇ is set forth in SEQ ID NO:34
  • the extracellular domain of a human CD3 ⁇ is set forth as SEQ ID NO:35.
  • the mouse may express a humanized CD3 ⁇ protein set forth in SEQ ID NO:24, a humanized CD3 ⁇ protein set forth in SEQ ID NO:25, and a humanized CD3 ⁇ set forth in SEQ ID N0:26.
  • introduction of the antigen of interest into the genetically modified mouse described herein may be accomplished by any methods known to those skilled in the art, which may include, without limitation, transgenesis, injection, infection, tissue or cell transplantation.
  • introduction may be achieved by expressing in the mouse the antigen of interest, which can comprise genetically modifying said mouse to express the antigen of interest.
  • introduction may comprise introduction into said mouse a cell expressing the antigen of interest, e.g., as in cell or tissue transplantation.
  • Introduction may also comprise infecting said mouse with the antigen of interest, e.g., as in bacterial or viral infection.
  • the antigen of interest may be a human antigen of interest. In another embodiment, it may be a bacterial or a viral antigen of interest.
  • the antigen of interest may be a tumor-associated antigen, as described in detail above.
  • the antigen may also be an infectious disease associated antigen, e.g., a bacterial or a viral antigen, as described in detail above.
  • the drug candidate may be an antigen-binding protein, e.g., an antibody, e.g., a bispecific antibody.
  • an antibody e.g., a bispecific antibody.
  • such drug candidate is capable of binding both human CD3 and the antigen of interest.
  • the antigen of interest may be a human antigen.
  • the antigen of interest may also be a primate, e.g., a monkey, antigen.
  • the drug candidate used for screening may be capable of binding both a human antigen and a corresponding primate antigen, in addition to binding human CD3.
  • the drug candidate may also be capable of binding primate, e.g., monkey, CD3.
  • the drug candidate may be capable of binding both human and primate, e.g., monkey, CD3; and also, in one embodiment, be capable of binding a human antigen of interest.
  • the antigen of interest may be a bacterial or a viral antigen
  • the drug candidate may be capable of binding both the human and primate, e.g., monkey, CD3 and the bacterial or viral antigen of interest.
  • the therapeutic candidate is an antibody, which is a human antibody. In other aspects, it may be a humanized antibody.
  • the therapeutic candidate may be an antibody generated in VELOCIMMUNE® mice (U.S. Pat. No. 8,502,018, incorporated herein by reference); thus, the initial antibody candidate may comprise a human variable region and a mouse constant region.
  • the mouse constant region of the antibody candidate may be reengineered to be of human origin by expressing the human variable region selected in VELOCIMMUNE® mice in operable linkage with a human constant region.
  • the therapeutic candidate is capable of reducing, eliminating, or preventing a disease.
  • the disease is a tumor
  • the therapeutic candidate is capable of reducing, eliminating, or preventing tumor growth as compared to an agent that does not target the antigen of interest.
  • determination whether the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest can be performed using a tumor volume assay, a tumor cell killing assay, induction of apoptotic markers in tumors, reduction in blood vessel growth in tumors, infiltration of immune cells into tumors, etc.
  • the disease is an infectious disease
  • a therapeutic candidate is capable reducing, eliminating, or preventing a bacterial or a viral infection as compared to an agent that does not target the antigen of interest.
  • determination whether the drug candidate is efficacious in preventing, reducing or eliminating cells characterized by the presence or expression of the antigen of interest can be performed using a measure of bacterial or viral titers, induction of apoptotic markers in infected cells, etc.
  • the humanized CD3 mouse is an immunocompetent mouse.
  • the humanized CD3 mouse of the invention which comprises a healthy normal immune system with intact development and complete complement of all immune cell types and intact immune signaling pathways, can be used to study the effects of various therapeutic candidates on specific cell types, cytokines, chemokines, etc. The mouse can then be used to answer mechanistic questions relating to drug candidate function.
  • humanized CD3 mice can be used in methods that involve testing the effect of bispecific anti-CD3 drug candidates on tumor grafts.
  • Previously developed mouse models were immunocompromised mouse models to allow for proper human tumor engraftment.
  • Humanized CD3 mouse is fully immunocompetent and allows introduction and growth of tumor cells expressing the antigen of interest, so full affect on the immune response can be studied, included but not limited to answering mechanistic questions, early toxicity questions, early efficacy questions, etc.
  • the mouse CD3 locus was humanized by construction of unique targeting vectors from human and mouse bacterial artificial chromosomes (BAC) DNA using VELOCIGENE® technology (see, e.g., U.S. Pat. No. 6,586,251 and Valenzuela et al. (2003) High-throughput engineering of the mouse genome couple with high-resolution expression analysis. Nat. Biotech. 21(6): 652-659, both incorporated herein by reference).
  • BAC bacterial artificial chromosomes
  • DNA from mouse BAC bMQ-425K11 was modified by homologous recombination to replace the genomic DNA encoding portions of mouse CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ genes (mouse CD3 genes located within close proximity to one another on chromosome 9) with corresponding portions of CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ genes derived from human BAC RP11-414G21 (human CD3 genes are located within close proximity to one another on chromosome 11), respectively.
  • the mouse BAC was first modified by replacing 714 bp of mouse Cd3d sequence (corresponding to partial sequence of mouse coding exons 2-3 of Cd3d gene) with 939 bp of human CD3D sequence (corresponding to partial sequence of human coding exons 2-3 of CD3D gene) in a single targeting event using a targeting vector comprising a Spec cassette using mouse homology arms.
  • Mouse BAC comprising a replacement of partial sequence of mouse coding exons 2-3 of CD3d gene with corresponding human sequence was subsequently modified by replacement of 1,738 bp of mouse Cd3g sequence (corresponding to partial sequence of mouse coding exons 2-4 of Cd3g gene) with 1,639 bp of human CD3G sequence (corresponding to partial sequence of human coding exons 2-4 of CD3G gene) also in a single targeting event using another Spec cassette-containing vector and mouse homology arms.
  • the BAC comprising the replacement of mouse CD3d and CD3g genes with corresponding human genes was further modified by replacing 6,213 bp mouse CD3e sequence with 6,817 bp of human sequence (corresponding to replacement of partial sequence of mouse coding exons 2 to 4 of mouse CD3e gene with partial sequence of human coding exons 2 to 5 of human CD3E gene).
  • a 4,996 bp floxed neomycin cassette was inserted upstream of human CD3E sequence knock-in.
  • the resulting humanized large targeting vector for insertion into ES cells is depicted in FIG. 2A , with A, B, C, D, E, F, and G indicating various mouse/human or mouse/NEO cassette or human/NEO cassette junctions.
  • the sequences at the junctions are depicted in Table 1 below.
  • the targeted BAC DNA was used to electroporate mouse ES cells comprising a deletion in mouse CD3 locus to create modified ES cells for generating mice that express humanized CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ on the surface of their T cells.
  • ES cells containing insertions of human CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ sequences were identified by a quantitative TAQMANTM assay (see, e.g., Lie and Petropoulos, 1998. Curr. Opin. Biotechnology 9:43-48, incorporated herein by reference).
  • Specific primer sets and probes were designed for detecting insertion of human sequences (gain-of-allele, GOA) and deletion of mouse sequences (loss-of-allele, LOA).
  • Table 2 identifies the names and locations of each of primers/probe sets used in the quantitative PCR assays.
  • Targeted ES cells described above were used as donor ES cells and introduced into an 8-cell stage mouse embryo by the VELOCIMOUSE® method (see, e.g., U.S. Pat. No. 7,294,754 and Poueymirou et al. (2007) F0 generation mice that are essentially fully derived from the donor gene-targeted ES cells allowing immediate phenotypic analyses Nature Biotech. 25(1):91-99).
  • VELOCIMICE® F0 mice fully derived from the donor ES cell
  • VELOCIMICE® independently bearing a humanized CD3 genes were identified by genotyping using a modification of allele assay (see above) that detects the presence of the unique human CD3 gene sequences.
  • the selection cassette may be removed by methods known by the skilled artisan.
  • ES cells bearing the humanized CD3 locus may be transfected with a construct that expresses Cre in order to remove floxed cassette.
  • the selection cassette may optionally be removed by breeding to mice that express Cre recombinase.
  • the selection cassette is retained in the mice.
  • the mouse/human junction of the humanized CD3 ⁇ allele after selection cassette removal (depicted as A-B in FIG. 2B ), is presented in Table 3 below. The remaining junction sequences are the same as in the targeting vector and are presented in Table 1 above.
  • FIG. 1B Junction Sequence NO: A-B 5′mouse CGACTTTCTTGACTTCTATTTGTTAAA 8 Cd3e/ CACTGTGCATTCACATCGAATGCTAGA XhoI/ AGTTTCCTCGTCCCGCTTCCTCCTGAA Lox/ TTGCCTGGGATCCTCTGCTTGATGCCC IceUI// TGTAGGAAACGTCCTTTCCTGTGGTAT human AGAAATGACTG/ CTCGAG / ATAACTTC CD3E GTATAATGTATGCTATACGAAGTTAT / GCTAGTAACTATAACGGTCCTAAGGTA GCGAGCTAGC//CTTCCACAGACACCA ATGTTCAAAATGGAGGCTTGGGGGCAA AATTCTITTGCTATGICTCTAGTCGTC CAAAAAATGGTCCTAACTITTTCTGAC TCCTGCTTGTCAAAAATTGTGGGCTCA TAGTTAATGC
  • CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ proteins are depicted in FIG. 3 and included in the sequence listing. Additionally, alignment of mouse-human sequences and junctions at the 5′ and 3′ of inserted human sequence are shown in FIG. 4 as * and **, respectively.
  • GenBank Protein Accession Numbers for CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ proteins are summarized below in Table 4.
  • Immune cell development in the thymus and periphery of human CD3 ⁇ mice was assessed using fluorescence-activated cell sorting (FACS) analysis and differential cell counting.
  • Thymus, spleen and lymph nodes were harvested from cohorts of wildtype (WT, no human CD3 ⁇ ), heterozygous (Het, one hCD3 ⁇ allele) and homozygous (Ho, two hCD3 ⁇ alleles) mice.
  • Peripheral blood was obtained by cardiac puncture or retro-orbital bleed into EDTA coated Microtainer tubes (BD).
  • Single cell suspensions were prepared from the spleen, LN and thymus using mechanical disruption, and red blood cells were removed from the spleen, thymus and whole blood by lysis with AKC Lysis buffer. Cells were incubated for 10 minutes at room temperature with purified antibodies to CD16/CD32 (FcBlock) to block non-specific binding via Fc receptors, and then incubated for 30 minutes at 4° C. with a cocktail of directly conjugated antibodies to T and B cell markers. Cells were washed twice with cold PBS containing 1% BSA, resuspended in buffer and analyzed by flow cytometry on a FACSCanto IITM flow cytometer (BD Biosciences).
  • FcBlock purified antibodies to CD16/CD32
  • Thymocytes were identified first by forward and side scatter gating, and then by gating on the B220 ⁇ population. In the periphery, T cells were identified as CD45+/TCRb+/B220 ⁇ , and B cells were identified as CD45+/TCRb ⁇ /B220+. Absolute counts were obtained on a Hemavet 950FS Hematology Analyzer.
  • humanized CD3 ⁇ mice appeared to have normal thymocyte development and normal T cell and B cell ratios in thymus, peripheral blood, and spleen. Additionally, T and B cell percentages appeared normal in lymph nodes, and absolute cell counts for spleen and lymph nodes (data not shown) were within normal range. CD4 and CD8 cell numbers in the blood were similar between the WT, Het, and Ho mice. Circulating white blood cells, lymphocytes, monocytes, neutrophils, eosinophils, and basophils all appeared within normal range (data not shown). Thus, normal immune cell development is observed in the humanized CD3 ⁇ mice.
  • LCMV lymphocytic choriomeningitis virus
  • mice were challenged with Clone 13 and two weeks after Clone 13 challenge viral titers were measured in spleens. No virus was detected in either control or humanized CD3 mice ( FIG. 6B ). The data suggests that the acute Armstrong infection was cleared. In addition, this demonstrates that T-cell memory that was elicited from the Armstrong infection was sufficient to protect mice from the subsequent Clone 13 infection in both strains of mice.
  • anti-CD3 antibodies 15 ug/ml
  • ah/mfCD3-2 and ah/mfCD3-1 are two antibodies that recognize both human and monkey CD3; ahCD3-2 and ahCD3-1 are two antibodies that only recognize human CD3, amCD3-2C11 is an antibody that recognizes mouse CD3 only, control human IgG is an unrelated control antibody, and 2 nd only is a secondary antibody only control.
  • Cells were washed twice with cold PBS containing 1% BSA, resuspended in buffer and analyzed by flow cytometry on a FACSCanto IITM flow cytometer (BD Biosciences). T cells were identified as CD45+/TCRb+/B220 ⁇ .
  • Anti-mCD3-2C11 engineered to contain hIgG1 was used to identify T cells on WT mouse splenocytes.
  • mice humanized for all three CD3 ⁇ , CD3 ⁇ , and CD3 ⁇ are relevant for early pre-clinical studies of CD3-based drug candidates which can be followed up by efficacy and toxicity studies in cynomolgus monkeys.
  • mice humanized for CD3 ⁇ (n of 2/group), were injected intraperitoneally with 10 ug of different human restricted or cynomolgus cross-reactive anti-CD3 antibodies (all hIgG1).
  • BD EDTA coated Microtainer tubes
  • the number of peripheral T and B cells was assessed by FACS. Briefly, 50 ul whole blood was incubated for 30 minutes at 4° C. with a cocktail of directly conjugated antibodies to T and B cell markers.
  • Red blood cells were removed by lysis with AKC Lysis buffer, and the labeled cells were washed one time with cold PBS containing 1% BSA. After washing, the cells were re-suspended in cold buffer and analyzed by flow cytometry on a FACSCANTO IITM flow cytometer (BD Biosciences). T cells were identified as live CD45-F/TCRb+/B220 ⁇ , and B cells were identified as live CD45+/TCRb ⁇ /B220+. Absolute cell counts were determined by adding a known quantity of CountBright TM Absolute Counting Beads. Plasma cytokine levels were assessed using a Mouse ProInflammatory 7-Plex Ultra-Sensitive Kit (Meso-Scale Discovery) from blood obtained 2 hours post injection.
  • anti-CD3 antibodies both anti-CD3 antibodies recognizing only human CD3 (ahCD3-1 and ahCD3-3) and anti-CD3 antibodies recognizing both human and monkey CD3 (ah/mfCD3-1 and ah/mfCD3-2)) induced cytokine production in CD3 ⁇ humanized mice ( FIG. 8B ).
  • splenocytes obtained from wild type or humanized CD3 ⁇ mice were assessed using ATP catalyzed quantification (CellTiter Glo®). The activation of mouse splenocytes results in the release of cytokines, which drive cellular proliferation. Proliferation data was acquired using the following protocol: splenocytes (5 ⁇ 10 5 /well) derived from wild type (WT) or humanized homozygous CD3 ⁇ (hCD3 ⁇ Ho) were added to 96 well plates which had been coated overnight at 4° C.
  • WT wild type
  • hCD3 ⁇ Ho humanized homozygous CD3 ⁇
  • splenocytes from humanized CD3 ⁇ mice were induced to proliferate by cynomolgus monkey-crossing CD3 antibodies.
  • CD3 ⁇ mice are able to bind human CD3 and respond to anti-human CD3 antibodies, particularly those that are known to cross-react with monkey CD3, which is an important aspect for therapeutic agents as preclinical studies on drug candidates are often conducted in large animals such as cynomolgus monkeys.
  • mice humanized for CD3 were humanized at the CD20 locus such that the mice expressed both humanized proteins.
  • Humanized CD3/CD20 mice were implanted subcutaneously with 2 ⁇ 10 5 B16F10.9 melanoma tumor cells transduced with human CD20.
  • Tumor volumes were measured as indicated in FIG. 11A . Mice were sacrificed when tumors reached volume of greater than 1500 mm 3 . As demonstrated in FIG. 11A , treatment with Ab 1 delayed tumor growth when treatment was initiated simultaneously with tumor transplantation.
  • FIG. 11B Humanized CD3/CD20 mice were implanted subcutaneously with 2 ⁇ 10 5 B16F10.9 melanoma tumor cells expressing human CD20. On day 10 post tumor implantation, mice were randomized based on tumor size and organized into the following treatment groups, 5 mice in each group: vehicle (PBS), 4 mg/kg control Ab 2 (control antibody that does not display cross-reactivity to CD20 antigen), 4 mg/kg of Ab 1, or 0.04 mg/kg Ab 1. All mice were treated i.p. 2 times a week. Mice were sacrificed when tumors reached volume of greater than 1500 mm 3 . As demonstrated in FIG. 11B , treatment with Ab 1 delayed tumor growth of already established tumors, demonstrating that the humanized CD3 mice are advantageous for early drug candidate studies.

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