From Oocyte to Embryo
Autor: | Jacqueline Mandelbaum, Catherine Turleau, Anne-Marie Junca, Jacques Salat-Baroux, Michelle Plachot, P. Couillin, J de Grouchy, Jean Cohen |
---|---|
Rok vydání: | 1988 |
Předmět: |
Chromosome Aberrations
Natural selection In vitro fertilisation business.industry medicine.medical_treatment Obstetrics and Gynecology Chromosome Chromosome Disorders Embryo Fertilization in Vitro General Medicine Aneuploidy Oocyte Cell biology Blastocyst medicine.anatomical_structure Karyotyping Oocytes medicine Humans Female Selection Genetic business |
Zdroj: | Obstetrical & Gynecological Survey. 43:115-116 |
ISSN: | 0029-7828 |
Popis: | A cytogenetical analysis was performed on 151 unfertilized oocytes, 22 fertilized eggs at the pronuclear stage, and 108 cleaved embryos obtained in the course of in vitro fertilization (IVF). Thirty-two per cent of unfertilized oocytes were abnormal, carrying nullisomies or disomies, mainly of D and G chromosomes, and a structural anomaly (Gq-) in one case. Fertilized eggs showed frequent asynchronism in the development of pronuclei and only 2 out of 8 karyotyped pronuclei were normal. Cleaved embryos were classified according to the number of pronuclei observed 17 hours after insemination. One per cent displayed a single pronucleus, and haploid chromosome complements were found in the corresponding cleaved embryos which were considered to be parthenotes. The rate of chromosome abnormalities of diploid eggs depended on their morphological aspect. Healthy cleaved embryos carried 12.5% of anomalies while this rate reached 37% in fragmented embryos (p less than 0.05). Lastly, 6% of fertilized eggs displayed three pronuclei or more. Only 41% of the corresponding embryos were triploid. Diploidy or diploidtriploid mosaicism were often encountered. This leads to a 21% rate of abnormalities in the preimplantation embryos. Parental karyotyping and HLA typing were carried out in a series of eight couples with in vitro idiopathic infertility or recurrent embryo degeneration in vitro. No abnormality was noted. According to these results, a model of natural selection of normal conceptuses is proposed. |
Databáze: | OpenAIRE |
Externí odkaz: |