Human Reproduction, Vol. 16, No. 9, 1954-1958,
September 2001
© 2001 European Society of Human Reproduction and Embryology
Developmental ability of chromosomally abnormal human embryos to develop to the blastocyst stage
Gamete and Embryo Research Laboratory, The Institute for Reproductive Medicine and Science of Saint Barnabas Medical Center, West Orange, NJ 07052, USA
BACKGROUND: A correlation between morphology, developmental competence and chromosome abnormalities is established. However, since absolute correlations are rare, embryo selection remains one of the most arduous tasks in assisted reproduction. This study was undertaken in order to determine which chromosomal abnormalities are compatible with development to the blastocyst stage. METHODS: Embryos diagnosed by preimplantation genetic diagnosis (PGD) as chromosomally abnormal or unsuitable for transfer were cultured to day 5 or 6. Morphology and development were observed daily. After extended culture, embryos were fixed and analysed by two rounds of FISH with the same probes used for PGD. RESULTS: Some types of numerical chromosome abnormalities do not preclude full differentiation in vitro. For instance, extensive mosaicism was detected in blastocysts and trisomic embryos reached the blastocyst stage with a frequency of 37%. Interestingly, only those monosomies compatible with first trimester development (monosomy X and 21) were detected at blastocyst stage. CONCLUSION: Even though there is a strong selection against chromosomally abnormal embryos, extended culture to day 5 or 6 cannot be used as a reliable tool to select against clinically relevant chromosome abnormalities such as trisomies.
Key words: blastocyst/chromosome abnormalities/embryo development/extended culture
1 To whom correspondence should be addressed. E-mail: mireia.sandalinas{at}embryos.net
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