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Primordial oocytes are a potential resource for medical and zoological application, but those of large animals have not yet been reported to show efficient embryonic development. In the present study, we established a pig model for production of blastocysts from primordial oocytes that had been grafted into nude mice and matured in vitro, in combination with fusion of cytoplasmic fragments. Neonatal porcine ovaries in which most follicles are at the primordial stage were minced and grafted into nude mice (Crlj:CD1-Foxn1(nu)). About 60 days after detection of vaginal opening, the mice were given 62.5 U/mL porcine FSH for 2 weeks by infusion to enhance follicular development. Developmentally competent oocytes collected from porcine ovaries (conventional oocytes) were matured in vitro and subjected to serial centrifugation to prepare cytoplasmic fragments without a metaphase plate (cytoplasts). Three cytoplasts were fused by electrostimulation to an oocyte retrieved from a host mouse (xenogeneic oocyte) and matured in vitro. Then these fused oocytes were fertilized and subsequently cultured in vitro. No blastocysts were generated from xenogeneic oocytes without fusion of cytoplasm. When xenogeneic oocytes had been fused with three cytoplasts, the blastocyst rate increased significantly to 14.3%, comparable to that for untreated conventional oocytes (20.0%). The numbers of cells in blastocysts for these fused oocytes (37.2 cells/blastocyst) were not significantly different from those for conventional oocytes (25.4 cells/blastocyst). Our findings show that it is possible to use primordial oocytes of large mammals in combination with xenografting of ovarian tissue and also ooplasmic fusion.
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