Morphological and cytogenetic assessment of cleavage and blastocyst stage embryos
Abstract
Morphological assessments are the main way in which fertility clinics select in vitro generated embryo(s) for transfer to the uterus. However, it is widely acknowledged that the microscopic appearance of an embryo is only weakly correlated with its viability. Furthermore, the extent to which morphology is affected by aneuploidy, a genetic defect common in human preimplantation embryos, remains unclear. Aneuploidy is of great relevance to embryo selection as it represents one of the most important causes of implantation failure and miscarriage. The current study aimed to examine whether morphological appearance can assist in identifying embryos at risk of aneuploidy. Additionally, the data produced sheds light on how chromosomal anomalies impact development from the cleavage to the blastocyst stage. A total of 1213 embryos were examined. Comprehensive chromosome analysis was combined with well-established criteria for the assessment of embryo morphology. At the cleavage stage, chromosome abnormalities were common even amongst embryos assigned the best morphological scores, indicating that aneuploidy has little effect on microscopic appearance at fixed time points up until Day 3 of development. However, at the blastocyst stage aneuploidies were found to be significantly less common among embryos of optimal morphological quality, while such abnormalities were overrepresented amongst embryos considered to be of poor morphology. Despite the link between aneuploidy and blastocyst a…
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Rates of aneuploidy are known to be significantly higher at the cleavage stage compared to the blastocyst.
“Because rates of aneuploidy are known to be significantly higher at the cleavage stage compared to the blastocyst (18)”
From Frequent loss of heterozygosity in CRISPR-Cas9–edited early human embryos (2021) · cites this paper as [18]
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- Authors
- Fragouli, E., Alfarawati, S., Spath, K., & Wells, D.
- Affiliations
- University of Oxford (GB)
- Corresponding author
- Fragouli, E.
- Venue
- Molecular Human Reproduction
- Publisher
- Oxford University Press (OUP)
- Published
- 2013-11-01
- Volume
- 20
- Issue
- 2
- Pages
- 117-126
- ISSN
- 1360-9947 (ISSN-L)
- 1460-2407
- OpenAlex
- W2142766753
- Cited by
- 189
- References
- 44
- Citations by year
- 2025: 11 · 2024: 22 · 2023: 22 · 2022: 18 · 2021: 24 · 2020: 15 · 2019: 15 · 2018: 13 · 2017: 17 · 2016: 13 · 2015: 11 · 2014: 8
- FWCI
- 9.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Molecular Human Reproduction (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute for Health and Care Research
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Screening and Diagnostics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Biology and Fertility
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Assisted Reproductive Technology and Twin Pregnancy
- Keywords
- embryo morphology, aneuploidy, preimplantation embryo, cleavage stage, blastocyst, embryo selection, chromosomal abnormalities, Down syndrome, sex ratio, embryo growth rate, implantation failure
- MeSH terms
- Aneuploidy, Blastocyst, Chromosomes, Human, Embryo Transfer, Female, Fertilization in Vitro, Humans, Male, Microscopy, Embryo Implantation, Pregnancy, Research Design, In Situ Hybridization, Fluorescence, Preimplantation Diagnosis, Cytogenetic Analysis, Comparative Genomic Hybridization
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