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Updated: Aug 14, 2025
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Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development
Published on: January 26, 2013
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Arrested Cells/Cellular Debris Expelled from Blastocysts Is Self-Correction Phenomenon During Early Embryonic
Xiaoxia Wang1,2, Jing Zhao1,3, Zhongyuan Yao1,3,4
1Department of Reproductive Center, Xiangya Hospital, Central South University, Changsha, 410078, Hunan, China.
Reproductive Sciences (Thousand Oaks, Calif.)
|January 10, 2023
Summary
Human embryos may self-correct by expelling abnormal cells. Analysis of expelled cellular debris and trophectoderm biopsies revealed high rates of aneuploidy and mosaicism, supporting this self-correction theory.
Area of Science:
- Reproductive biology
- Genetics
- Embryology
Background:
- Cellular debris in the zona pellucida after blastocyst hatching is a common observation.
- The biological significance of expelling arrested cells or cellular debris from human blastocysts remains unclear.
Purpose of the Study:
- To investigate if the expulsion of arrested cells/cellular debris from human blastocysts represents a self-correction mechanism.
- To determine if this expulsion process eliminates abnormal embryonic cells.
Main Methods:
- Collection of 21 pairs of trophectoderm (TE) biopsies and corresponding expelled arrested cells/debris from human blastocysts.
- Analysis of collected samples using next-generation sequencing (NGS).
- Comparison of NGS results between TE biopsies and expelled arrested cells/debris.
Main Results:
- 47.6% of blastocysts analyzed exhibited aneuploidies and mosaicism.
- 85.7% of expelled arrested cells/debris groups were abnormal, including aneuploid and euploid embryos.
- All chromosomes were affected in the abnormal arrested cells/debris, indicating widespread chromosomal abnormalities.
Conclusions:
- Mosaicism and aneuploidies are frequent occurrences during early human embryonic development.
- The expulsion of arrested cells/cellular debris from blastocysts provides evidence for an early embryonic self-correction mechanism.
- This process appears to eliminate chromosomally abnormal cells, contributing to developmental quality control.
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