We announce the success of a pioneering in vitro protocol developed at the I.D. Stem Cell and Genome Institute , aimed at treating absolute infertility by converting mesenchymal stem cells (MSCs) into functional gametes.

Methodology and Molecular Characterization: The protocol relied on extracting MSCs from the patient's bone marrow after stimulation with G-CSF. Detailed characterization showed that 75% of these cells were positive for the Oct-4 marker, reflecting the retention of sufficient pluripotency in adult cells to initiate gamete differentiation.

Biological Sequencing and Biomarkers: The temporal milestones of transformation were monitored with high in vitro precision:

- Initial phase (day 13): Initiation of meiosis with the appearance of the DAZL protein.

- Recombination phase (day 15): Detection of the DMC1 marker, confirming the genomic stability of mitosis.

- Structural Maturation (Days 32-45): Synthesis of the enzyme acrosin and formation of the apical body, the mechanical key for egg penetration.

- Release and Motility (Days 73-75): Elongation of the tail and the onset of spontaneous motility.

-Evaluation of Functional Performance (IVF Outcome): The study did not stop at morphology but proceeded to functional evaluation through two cycles of in vitro fertilization:

- Results: Successful fertilization of 14 donor eggs and production of morula-stage embryos, which were successfully frozen.

- Technical Challenge: The team identified the need to improve culture media to enhance mitochondrial function, ensuring the sustainability of sperm motility in advanced laboratory environments.

This achievement proves that absolute infertility has become a manageable technical challenge, as this technology opens up prospects for radically restoring fertility, from protecting the fertility of cancer patients to gene correction (CRISPR), which ensures complete genetic independence for the parents and confirms the role of regenerative medicine as a cornerstone for the future of reproductive care.