Human Reproduction, Vol 13, 169-177, Copyright © 1998 by Oxford University Press
GM Jones, AO Trounson, DK Gardner, A Kausche, N Lolatgis and C Wood
A cell-free culture system was designed for human embryo development to the
blastocyst stage by testing a range of culture conditions in a series of
protocols. The culture system that was evolved has a brief 1 h exposure to
spermatozoa and then culture of the pronucleate zygote for 2 days in IVF-50
medium. Two or three embryos were cultured together in 20 microl microdrops
of medium under oil. Embryos were then regrouped and two or three at a
similar stage were cultured together in 50 microl microdrops of Gardner's
G2 medium under oil from days 3 to 5. Embryos were transferred to fresh G2
medium on day 5 and cultured for a further 1 or 2 days (day 6 or 7). No
serum was used in any of the cultures. The embryo transfer medium and G2
medium were supplemented with human serum albumin. The zonae of all
blastocysts to be transferred to patients were completely removed
enzymatically. Using this protocol, 52% of zygotes developed to blastocysts
and 34 out of 35 patients treated received 82 blastocysts and 11 morulae on
day 5 or 6. Twenty-one fetal sacs with positive heartbeats (23%
implantation rate) were detected in 13 ongoing pregnancies (38% pregnancy
rate/transfer or 37%/patient treated). We anticipate that further
improvements in embryo development and the selection of viable embryos can
be achieved using this simple and effective culture system.
ARTICLES
Evolution of a culture protocol for successful blastocyst development and pregnancy
Centre for Early Human Development, Institute of Reproduction and Development, Monash University, Monash Medical Centre, Australia.
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