Vitrification of biopsied embryos at cleavage, morula and blastocyst stage. 2009

Xiao Zhang, and Krinos M Trokoudes, and Constantinos Pavlides
Pedieos IVF Center, Nicosia, Cyprus. zhangxiaoivf@gmail.com

This study investigated the effect of vitrification on biopsied embryos at various developmental stages. After biopsy on day 3, embryos were vitrified at cleavage, morula and blastocyst stages using a commercially available kit. Nonbiopsied embryos were vitrified as controls. For day-3 cleavage embryo vitrification, embryos from abnormally fertilized oocytes were randomly allocated to the biopsy and control groups. For morula and blastocyst vitrification, the embryos used in the biopsy groups were obtained from aneuploidy or affected embryos diagnosed by preimplantation genetic diagnosis (PGD). After warming, survival, blastulation and development of embryos in different groups were compared. The survival rate after warming in the non-biopsied cleavage control group was significantly higher than in the biopsied cleavage group (92.0% versus 64.0%, P = 0.037). Most of the biopsied embryos were destroyed due to blastomeres escaping. At the morula stage, both biopsied and non-biopsied embryos had similar survival rates. However, a significantly higher survival rate (95.6%) was observed in the biopsied blastocyst group compared with the control group (81.3%, P = 0.035). Biopsied embryos vitrified at an advanced stage had as high survival rates as non-biopsied embryos. Vitrification at the blastocyst stage is a practical and efficient solution for embryo cryopreservation during PGD.

UI MeSH Term Description Entries
D009028 Morula An early embryo that is a compact mass of about 16 BLASTOMERES. It resembles a cluster of mulberries with two types of cells, outer cells and inner cells. Morula is the stage before BLASTULA in non-mammalian animals or a BLASTOCYST in mammals. Morulas
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D001755 Blastocyst A post-MORULA preimplantation mammalian embryo that develops from a 32-cell stage into a fluid-filled hollow ball of over a hundred cells. A blastocyst has two distinctive tissues. The outer layer of trophoblasts gives rise to extra-embryonic tissues. The inner cell mass gives rise to the embryonic disc and eventual embryo proper. Embryo, Preimplantation,Blastocysts,Embryos, Preimplantation,Preimplantation Embryo,Preimplantation Embryos
D002970 Cleavage Stage, Ovum The earliest developmental stage of a fertilized ovum (ZYGOTE) during which there are several mitotic divisions within the ZONA PELLUCIDA. Each cleavage or segmentation yields two BLASTOMERES of about half size of the parent cell. This cleavage stage generally covers the period up to 16-cell MORULA. Segmentation Stage, Ovum,Cleavage Stages, Ovum,Ovum Cleavage Stage,Ovum Cleavage Stages,Ovum Segmentation Stage,Ovum Segmentation Stages,Segmentation Stages, Ovum
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D001706 Biopsy Removal and pathologic examination of specimens from the living body. Biopsies
D015925 Cryopreservation Preservation of cells, tissues, organs, or embryos by freezing. In histological preparations, cryopreservation or cryofixation is used to maintain the existing form, structure, and chemical composition of all the constituent elements of the specimens. Cryofixation,Cryonic Suspension,Cryonic Suspensions,Suspension, Cryonic
D046149 Embryo Culture Techniques The technique of maintaining or growing mammalian EMBRYOS in vitro. This method offers an opportunity to observe EMBRYONIC DEVELOPMENT; METABOLISM; and susceptibility to TERATOGENS. Blastocyst Culture Techniques,Blastocyst Culture Technique,Culture Technique, Blastocyst,Culture Technique, Embryo,Culture Techniques, Blastocyst,Culture Techniques, Embryo,Embryo Culture Technique

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