The present disclosure relates to the in vitro differentiation of memory B cells to plasmablasts or plasma cells and genetic modification of these cells to express a protein of interest, such as a specific antibody or other protein therapeutic.

Genonie-edited primary B cells, methods of making genome-edited primary B cells, a therapeutic cassette that can be introduced into primary B cells, and methods of using the genome-edited primary B cells and the therapeutic cassette.

The antigen-presenting cell loaded with the cancer-specific tumor antigen epitope provided in the present invention, that is, a dendritic cell enables rapid and effective induction of differentiation and proliferation of cancer antigen-specific T cells, preferably memory T cells, and the memory T cells thus activated can treat a cancerous or neoplastic condition or prevent recurrence, progression, or metastasis of cancer while avoiding the defense mechanism of cancer cells.

Some embodiments of the methods and compositions provided herein include preparing modified B cells. In some embodiments, an endogenous beta-2 microglobulin (B2M) gene in a B cell is modified. Some embodiments relate to increasing the resistance of modified B cells to killing by allogeneic immune cells. In some embodiments, the endogenous B2M gene is inactivated increasing the resistance of the modified B cell to killing by allogeneic immune cells. In some embodiments, a replacement MHC-I is inserted into an inactivated endogenous B2M gene increasing the resistance of the modified B cell to killing by allogeneic immune cells. Some embodiments include enriching for successfully modified cells.

This disclosure provides, among other things, strategies for minimizing antibody diversification in a transgenic animal that uses gene conversion for antibody diversification. In some embodiments, the animal may comprise a genome comprising an endogenous immunoglobulin light chain locus comprising: (a) a functional immunoglobulin light chain gene comprising a nucleic acid encoding a light chain variable region; and (b) a plurality of pseudogenes that are operably linked to the functional immunoglobulin light chain gene and that donate, by gene conversion, nucleotide sequence to the nucleic acid encoding a light chain variable region, wherein the pseudogenes are upstream or downstream of the functional immunoglobulin light chain gene and encode the same amino acid sequence as the light chain variable region of the functional immunoglobulin light chain gene of (a). In other embodiments, the locus may have a tandem array of coding sequences for the light chain.

Described herein are human transgenic beta cells expressing fugetactic levels of CXCL12 to a subject in need thereof. Also described herein are beta cells comprising a transgene comprising a nucleic acid sequence encoding CXCL12.

Disclosed herein are methods and compositions for generating immunotherapeutic cells (e.g., NK and T cells) with enhanced cytotoxicity and capacity for expansion thereof. The methods and compositions disclosed herein can further be used for enhanced expansion of CAR-modified NK and T cells with increased cytotoxicity.

Disclosed are methods for conditionally immortalizing stem cells, including adult and embryonic stem cells, the cells produced by such methods, therapeutic and laboratory or research methods of using such cells, and methods to identify compounds related to cell differentiation and development or to treat diseases, using such cells. A mouse model of acute myeloid leukemia (AML) and cells and methods related to such mouse model are also described.

Described herein are human transgenic beta cells expressing fugetactic levels of CXCL12 to a subject in need thereof. Also described herein are beta cells comprising a transgene comprising a nucleic acid sequence encoding CXCL12.

Provided herein are methods and compositions related to the targeting of Bregs for the treatment of diseases and disorders involving inappropriate suppression of B cell-mediated immune function.