Chromosome abnormalities in 1255 cleavage-stage human embryos - PubMed (original) (raw)
Chromosome abnormalities in 1255 cleavage-stage human embryos
C Márquez et al. Reprod Biomed Online. 2000.
Abstract
The relationship was examined between chromosome abnormalities in cleavage stage human embryos and maternal age, embryo morphology and development rate. Embryos that were classified as suboptimal for transfer from patients undergoing IVF treatment were disaggregated, and all or most of their cells were fixed for analysis by fluorescence in-situ hybridization. Chromosomes X, Y, 13, 18 and 21, and in some instances 16 were examined. A total of 731 non-viable embryos was analysed. An increase in chromosome abnormalities with decreasing embryo competence and increasing maternal age was shown. Compared with an earlier study, the major difference was that polyploidy (P<00.01) and aneuploidy were previously more common. After pooling results, it was found that aneuploidy increased with maternal age, from 3.1% in embryos from 20-34 years old patients to 17% in patients 40 years or older. Also, aneuploidy occurred more frequently in embryos with good morphology and development rate than in embryos developing poorly. In contrast, dysmorphic and slowly developing or arrested embryos had significantly more polyploidy and mosaicism than normally developing embryos. Clear associations between maternal age and aneuploidy, and between cleavage anomalies and mosaicism have been established in non-viable embryos. Arrested embryos were mostly polyploid. Moreover, polyploidy was found more frequently in embryos analysed on day 4, suggesting that developmentally compromised embryos became arrested in extended culture. A slightly higher aneuploidy rate in the earlier study may be attributed to differences in hormonal stimulation, which also resulted in different numbers of oocytes recruited and matured.
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