Abstract
This study deals with the suitability of Ham's F-10 without hypoxanthine for early cleavage-stage embryo culture. A high percentage of mouse two-cell embryos developed into morula and blastocysts in Ham's F-10 formulated without hypoxanthine (75.3 and 71.6%, respectively); in contrast, in agreement with previous reports, only 15.4% developed beyond the two-cell stage in Ham's F-10 with hypoxanthine. To begin to evaluate the effect of hypoxanthine on human embryos, a total of 318 human oocytes was fertilized and cultured in Ham's F-10 minus hypoxanthine. The fertilization, cleavage, and pregnancy percentages in two ovulation induction protocols [human menopausal gonadotropin (hMG)/human chorionic gonadotropin (hCG) and gonadotropin releasing hormone/hMG/hCG] were 82, 88, and 20 and 83, 91, and 30%, respectively. These results suggest that, in agreement with mouse embryo development, hypoxanthine does not appear to be necessary for human embryo cleavage and its omission from Ham's F-10 may enhance the conditions for culture of early-cleaving human embryos. These observations may lead to a better understanding of critical cell processes during early human embryonic development.
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