Il2rg gene-targeted severe combined immunodeficiency pigs

Area of Science:

• Immunology
• Genetics
• Animal Models

Background:

• Severe combined immunodeficiency (SCID) models are essential for studying immune deficiencies and developing therapies.
• A well-characterized porcine SCID model has been lacking, hindering advancements in human disease research and regenerative medicine.

Purpose of the Study:

• To generate and evaluate a porcine model of severe combined immunodeficiency (SCID).
• To establish a preclinical tool for human cancer studies, xenotransplantation, and stem cell therapy evaluation.

Main Methods:

• Generation of cloned pigs using fibroblasts with a targeted disruption of the interleukin-2 receptor gamma chain (Il2rg) gene.
• Serial nuclear transfer technique was employed for cloning.
• Evaluation of lymphoid lineage reconstitution following allogeneic bone marrow transplantation.

Main Results:

• Successful generation of pigs with germline transmission of the Il2rg deletion.
• Il2rg(-/Y) male pigs exhibited athymia and impaired immunoglobulin, T cell, and NK cell production, mirroring human SCID.
• Donor cells stably integrated and reconstituted the lymphoid lineage in Il2rg(-/Y) heterozygotes post-transplantation.

Conclusions:

• The developed porcine SCID model accurately recapitulates human SCID.
• This model provides a valuable platform for preclinical evaluation of cellular regenerative strategies and cancer research.
• The study represents a significant step towards advancing clinical therapies using animal models.