Postdoctoral Position: Generating Human Organs from Stem Cells for Transplantation

The In vivo Organ Generation by Stem Cells Group, led by Dr. Xabier Aranguren at CIMA – University of Navarra (Pamplona, Spain), is looking for a highly motivated postdoctoral researcher to join our team.

https://cima.cun.es/investigacion/programas-investigacion/programa-ingenieria-biomedica/grupo-investigacion-generacion-organos-in-vivo-celulas-madre

What if we could grow a human organ inside an animal using the patient’s own stem cells?

Organ transplantation is one of the most effective treatments for end-stage organ failure. However, the number of organs available for transplantation remains severely limited, resulting in long waiting lists and significant mortality among patients awaiting transplantation. This unmet clinical need has driven the search for alternative sources of organs, including approaches based on pluripotent stem cells (PSCs).

Our research focuses on developing a radically different approach: generating organs in vivo from pluripotent stem cells using blastocyst complementation. In this strategy, pluripotent stem cells are introduced into genetically modified embryos that are unable to develop a specific organ. The donor stem cells can then occupy the developmental niche and contribute to the formation of the missing organ. Our ultimate goal is to develop the scientific basis for the generation of humanized organs in large-animal models, with a long-term vision of providing new sources of organs for transplantation.

The successful candidate will work at the intersection of stem cell biology, developmental biology, interspecies chimerism and biomedical engineering. Depending on the candidate's interests and background, the project may involve:

• Understanding the mechanisms that limit the contribution of human stem cells to animal embryos.
• Developing strategies to improve human–animal interspecies chimerism.
• Studying cell competition and selective elimination between donor and host cells.
• Investigating the developmental requirements for generating specific organs, including the heart.
• Applying advanced genomic and single-cell approaches to characterize chimeric embryos and tissues.
• Translating findings from mouse and rat models towards pig models, with the long-term objective of generating humanized organs.

The successful candidate will play an active role in developing the research project, with the opportunity to propose and test new experimental approaches, while working closely with the PI, other members of the team and international collaborators.

The project combines fundamental developmental biology with a clear translational objective, offering the opportunity to contribute to an emerging field with potential long-term impact on regenerative medicine and organ transplantation.

Our research environment provides access to state-of-the-art technologies, including pluripotent stem cell culture and differentiation, embryo manipulation and microinjection, genome editing, genetically modified animal models, immunofluorescence and histology, single-cell RNA sequencing and other genomic approaches.

Recent publications:

• Blastocyst complementation: current progress and future directions in xenogeneic organogenesis, Stem Cell Research & Therapy, 2025
• Generation of heart and vascular system in rodents by blastocyst complementation, Dev Cell, 2023
• Revealing cell populations catching the early stages of human embryo development in naive pluripotent stem cell cultures, Stem Cell Reports, 2023

What we offer

• The opportunity to work on a high-risk, high-impact research programme at the forefront of stem cell biology and regenerative medicine.
• The opportunity to take scientific responsibility for specific aspects of an ambitious research programme and contribute to the development of new experimental approaches.
• A highly collaborative and international research environment.
• Opportunities to collaborate with leading international groups in the field.
• Participation in scientific meetings, conferences and international collaborations.
• The opportunity to develop an independent research profile and contribute to high-impact publications.
• A translational research environment within CIMA – University of Navarra, connecting fundamental research with biomedical applications.
• An interdisciplinary environment combining developmental biology, stem cell biology, biomedical engineering and translational research.