Abstract
Objective
The aim of the study is to investigate the meiotic segregation in fresh eggs from anonymous egg donors and to analyze the baseline levels of aneuploidy in this population.
Results
The study includes the largest series of donor eggs so far studied: 203 eggs from donors aged between 20 and 31 years. No diagnosis was obtained in 10.8 % of cases (22/ 203). The biopsy of the first and second polar bodies was completed in a sequential manner on day 0 and day 1 of embryo development. Chromosomes 13, 16, 18, 21 and 22 are analyzed by means of the FISH test. The diagnosable fertilized eggs gave an aneuploidy rate of 19.1 % (31/162), with 83.8 % (26/31) of the errors produced during meiosis I, 12.9 % (4/31) produced during meiosis II, and 3.2 % (1/31) produced during both meiosis I and II. The premature division of sister chromatids is the main source of meiotic error during Meiosis I, resulting in the creation of oocyte aneuploidy.
Conclusions
FISH analysis of the first and second polar body in donor oocytes gave an aneuploidy rate of 19.1 %. This study shows the majority of errors occur during Meiosis I.
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Leonardo Marques Foundation
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Capsule FISH analysis of the first and second polar body in donor oocytes gave an aneuploidy rate of 19.1%. This study shows the majority of errors (83.8%) occur during Meiosis I.
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Velilla, E., Fernández, S.F., Suñol, J. et al. A study of meiotic segregation in a fertile human population following ovarian stimulation with recombinant FSH-LH. J Assist Reprod Genet 30, 269–274 (2013). https://doi.org/10.1007/s10815-012-9905-9
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DOI: https://doi.org/10.1007/s10815-012-9905-9