Human Reproduction, Vol. 9, No. 7, pp. 1318-1321, 1994
© 1994 European Society of Human Reproduction and Embryology
research-article |
Fertilization and early embrology: Monozygotic twinning in the human is associated with the zona pellucida architecture
The Center for Reproductive Medicine and Infertility, Cornell University Medical CenterThe New York Hospital 505 East 70th Street, HT 330, New York, NY 10021, USA
Correspondence: 1To whom correspondence should be addressed
Six cases of identical twin pregnancies which occurred in 2163 cycles of in-vitro fertilization during a 3 year period are reported. Monozygosity was confirmed when the number of fetuses exceeded the number of embryos replaced (n = 4) or when two concepti were observed in a single amniotic sac (n = 2). Each of the reported pregnancies resulted from replacement of embryos either with naturally thin zonae pellucida or embryos whose zonae had been breached during micromanipulation for assisted fertilization (subzonal sperminsertion) or assisted hatching. That such cases exclusively gave rise to monozygosity suggests a link between the physical state of the zona pellucida, hatching, and generation of identical twins.
Key words: hatching/inner cell mass/micromanipulation/monozygotic twinning/zona pellucida
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