alexa Do assisted reproductive technologies have effects on the demography of monozygotic twinning?
Genetics & Molecular Biology

Genetics & Molecular Biology

Human Genetics & Embryology

Author(s): Saito H, Tsutsumi O, Noda Y, Ibuki Y, Hiroi M

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Abstract PIP: This study examined the incidence of monozygotic twinning of one embryo with the use of cycles in which only one embryo, treated by various assisted reproductive technologies (ART), was transferred. It also examined the possibility of demographic alterations in the overall incidence of monozygotic twinning in Japan induced by ART. A total of 134 clinics or institutes participated in this study. Overall, it is noted that the incidence of monozygotic twinning in Japan has been almost constant (0.402\%). In ART treatments, the monozygotic twinning rate was significantly higher than that of natural pregnancies (P = 0.0204). For in vitro fertilization (IVF) treatment cycles, the monozygotic twinning rate was also higher than that of natural pregnancies (P = 0.6285). However, this difference was not statistically significant because of the small number of IVF pregnancies. Moreover, in the context of microinsemination cycles, the monozygotic twinning rate was significantly higher than that of natural pregnancies (P = 0.0285) or IVF (P = 0.0006). In terms of the possible impact of ART on the demography of monozygotic twinning, adoption of mechanically assisted hatching for all embryos in Japan may alter the demography of monozygotic twinning.
This article was published in Fertil Steril and referenced in Human Genetics & Embryology

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