Biotechnological advancements in the fields of animal organ transplantation and xenotransplantation have made significant strides over the past few decades. These advancements offer promising solutions to the worldwide shortage of organs needed for transplants. Xenotransplantation – transplanting organs or tissues from animals to humans – shows great potential in tackling this problem. Recent breakthroughs in biotechnology, such as genetic engineering, immune suppression techniques, and improved organ preservation methods, have brought xenotransplantation to the cutting edge of medical research. The success of transplanting animal organs into humans depends on overcoming the immune system’s natural rejection of foreign tissues. One of the major challenges has been the use of genetically modified animals that possess organs that are more compatible with human biology. This review delves into the technological advances in genetic modification, particularly in the development of transgenic pigs, and the use of CRISPR-Cas9 gene editing tools. These innovations have been instrumental in producing organs with reduced risk of rejection and enhanced compatibility with human recipients. Furthermore, the development of immune-modulating therapies, such as monoclonal antibodies and immunosuppressants, has contributed to minimizing the likelihood of immune rejection. Biotechnological advancements in tissue engineering have also allowed for better preservation of animal organs, extending their functional lifespan, and reducing the need for immediate transplantation. Despite the progress, ethical concerns and potential risks associated with xenotransplantation remain. The possibility of cross-species transmission of infectious diseases, the creation of transgenic animals, and the impact on biodiversity raise significant ethical questions. Regulatory frameworks are being put in place to address these concerns, yet much more research is required before xenotransplantation becomes a routine practice. This review article examines the current state of animal organ transplantation, the biotechnological advancements enabling xenotransplantation, the challenges that still need to be addressed, and the outlook for this promising field. The article highlights both the benefits, and the risks involved, aiming to provide a comprehensive understanding of how these biotechnological advances might revolutionize the field of organ transplantation.

Keywords: Xenotransplantation, genetic engineering, animal organ transplantation, CRISPR-Cas9, transgenic pigs, immune suppression, ethical issues

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1. Cengiz N, Wareham CS. Ethical considerations in xenotransplantation: a review. Current Opinion in Organ Transplantation. 2020 Oct 1;25(5):483–8.
2. Lei T, Chen L, Wang K, Du S, Gonelle-Gispert C, Wang Y, et al. Genetic engineering of pigs for xenotransplantation to overcome immune rejection and physiological incompatibilities: The first clinical steps. Frontiers in Immunology. 2022 Dec 6;13:1031185.
3. Xi J, Zheng W, Chen M, Zou Q, Tang C, Zhou X. Genetically engineered pigs for xenotransplantation: Hopes and challenges. Frontiers in Cell and Developmental Biology. 2023 Jan 12;10:1093534.
4. Zhou Q, Li T, Wang K, Zhang Q, Geng Z, Deng S, et al. Current status of xenotransplantation research and the strategies for preventing xenograft rejection. Frontiers in Immunology. 2022 Jul 28;13:928173
5. Yakura H. Cognitive and memory functions in plant immunity. Vaccines. 2020 Sep 17;8(3):541.
6. Hameed AM, Hawthorne WJ, Pleass HC. Advances in organ preservation for transplantation. ANZ journal of surgery. 2017 Dec;87(12):976–80.
7. Boneva R, Folks T. Xenotransplantation and risks of zoonotic infections. Annals of medicine. 2004 Jan 1;36(7):504–17.
8. Zhang Z, Bédard E, Luo Y, Wang H, Deng S, Kelvin D, et al. Animal models in xenotransplantation. Expert Opinion on Investigational Drugs. 2000 Sep 1;9(9):2051–68.
9. Arabi TZ, Sabbah BN, Lerman A, Zhu XY, Lerman LO. Xenotransplantation: current challenges and emerging solutions. Cell transplantation. 2023 Jan;32:09636897221148771.
10. Cooper DK, Pierson III RN, Hering BJ, Mohiuddin MM, Fishman JA, Denner J, et al. Regulation of clinical xenotransplantation—time for a reappraisal. Transplantation. 2017 Aug 1;101(8):1766–9.
11. Kögel J, Marckmann G. “Xenotransplantation challenges us as a society” What well‐informed citizens think about xenotransplantation. EMBO reports. 2020 Sep 3;21(9):e50274.
12. Wolbrom DH, Kim JI, Griesemer A. The road to xenotransplantation. Current Opinion in Organ Transplantation. 2023 Apr 1;28(2):65–70.

Biotechnological advancements in the fields of animal organ transplantation and xenotransplantation have made significant strides over the past few decades. These advancements offer promising solutions to the worldwide shortage of organs needed for transplants. Xenotransplantation – transplanting organs or tissues from animals to humans – shows great potential in tackling this problem. Recent breakthroughs in biotechnology, such as genetic engineering, immune suppression techniques, and improved organ preservation methods, have brought xenotransplantation to the cutting edge of medical research. The success of transplanting animal organs into humans depends on overcoming the immune system’s natural rejection of foreign tissues. One of the major challenges has been the use of genetically modified animals that possess organs that are more compatible with human biology. This review delves into the technological advances in genetic modification, particularly in the development of transgenic pigs, and the use of CRISPR-Cas9 gene editing tools. These innovations have been instrumental in producing organs with reduced risk of rejection and enhanced compatibility with human recipients. Furthermore, the development of immune-modulating therapies, such as monoclonal antibodies and immunosuppressants, has contributed to minimizing the likelihood of immune rejection. Biotechnological advancements in tissue engineering have also allowed for better preservation of animal organs, extending their functional lifespan, and reducing the need for immediate transplantation. Despite the progress, ethical concerns and potential risks associated with xenotransplantation remain. The possibility of cross-species transmission of infectious diseases, the creation of transgenic animals, and the impact on biodiversity raise significant ethical questions. Regulatory frameworks are being put in place to address these concerns, yet much more research is required before xenotransplantation becomes a routine practice. This review article examines the current state of animal organ transplantation, the biotechnological advancements enabling xenotransplantation, the challenges that still need to be addressed, and the outlook for this promising field. The article highlights both the benefits, and the risks involved, aiming to provide a comprehensive understanding of how these biotechnological advances might revolutionize the field of organ transplantation.

Keywords: Xenotransplantation, genetic engineering, animal organ transplantation, CRISPR-Cas9, transgenic pigs, immune suppression, ethical issues

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.

1. Cengiz N, Wareham CS. Ethical considerations in xenotransplantation: a review. Current Opinion in Organ Transplantation. 2020 Oct 1;25(5):483–8.
2. Lei T, Chen L, Wang K, Du S, Gonelle-Gispert C, Wang Y, et al. Genetic engineering of pigs for xenotransplantation to overcome immune rejection and physiological incompatibilities: The first clinical steps. Frontiers in Immunology. 2022 Dec 6;13:1031185.
3. Xi J, Zheng W, Chen M, Zou Q, Tang C, Zhou X. Genetically engineered pigs for xenotransplantation: Hopes and challenges. Frontiers in Cell and Developmental Biology. 2023 Jan 12;10:1093534.
4. Zhou Q, Li T, Wang K, Zhang Q, Geng Z, Deng S, et al. Current status of xenotransplantation research and the strategies for preventing xenograft rejection. Frontiers in Immunology. 2022 Jul 28;13:928173
5. Yakura H. Cognitive and memory functions in plant immunity. Vaccines. 2020 Sep 17;8(3):541.
6. Hameed AM, Hawthorne WJ, Pleass HC. Advances in organ preservation for transplantation. ANZ journal of surgery. 2017 Dec;87(12):976–80.
7. Boneva R, Folks T. Xenotransplantation and risks of zoonotic infections. Annals of medicine. 2004 Jan 1;36(7):504–17.
8. Zhang Z, Bédard E, Luo Y, Wang H, Deng S, Kelvin D, et al. Animal models in xenotransplantation. Expert Opinion on Investigational Drugs. 2000 Sep 1;9(9):2051–68.
9. Arabi TZ, Sabbah BN, Lerman A, Zhu XY, Lerman LO. Xenotransplantation: current challenges and emerging solutions. Cell transplantation. 2023 Jan;32:09636897221148771.
10. Cooper DK, Pierson III RN, Hering BJ, Mohiuddin MM, Fishman JA, Denner J, et al. Regulation of clinical xenotransplantation—time for a reappraisal. Transplantation. 2017 Aug 1;101(8):1766–9.
11. Kögel J, Marckmann G. “Xenotransplantation challenges us as a society” What well‐informed citizens think about xenotransplantation. EMBO reports. 2020 Sep 3;21(9):e50274.
12. Wolbrom DH, Kim JI, Griesemer A. The road to xenotransplantation. Current Opinion in Organ Transplantation. 2023 Apr 1;28(2):65–70.