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Human Blastocyst Biopsy and Vitrification
Published on: July 26, 2019
Mouse blastocyst previtrification interventions and DNA integrity.
Amr Kader1, Rakesh K Sharma, Tommaso Falcone
1Center for Reproductive Medicine, Glickman Urological and Kidney Institute, and Obstetrics and Gynecology and Women's Health Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA.
Fertility and Sterility
|April 4, 2009
Summary
Pre-vitrification interventions like blastocele aspiration or assisted hatching significantly improve blastocyst DNA integrity after warming. These methods protect blastomere DNA from damage during cryopreservation, enhancing embryo viability.
Area of Science:
- Reproductive biology and cryobiology.
- Embryology and assisted reproductive technologies (ART).
Background:
- Vitrification is a common cryopreservation technique for human embryos.
- Maintaining DNA integrity post-warming is crucial for successful embryo development.
- Pre-vitrification interventions may impact DNA integrity.
Purpose of the Study:
- To evaluate the impact of different pre-vitrification interventions on blastocyst DNA integrity post-warming.
- To compare the effectiveness of blastocele aspiration, spontaneous hatching, and assisted hatching.
Main Methods:
- Prospective in vitro study using mouse blastocysts (expanded and nonexpanded).
- Interventions included blastocele aspiration, spontaneous hatching, and assisted hatching (acidified Tyrode's solution).
- DNA integrity assessed using terminal deoxynucleotide transferase [TdT]-mediated dUTP-digoxigenin nick-end labeling and confocal imaging.
Main Results:
- Blastocele aspiration (expanded) and assisted hatching (nonexpanded) significantly improved postwarming DNA integrity.
- Spontaneous hatching before vitrification also enhanced DNA integrity in expanded blastocysts, comparable to blastocele aspiration.
- These interventions effectively minimized DNA damage in blastomeres post-warming.
Conclusions:
- Pre-vitrification interventions are vital for preserving DNA integrity in vitrified blastocysts.
- Blastocele aspiration, spontaneous hatching, and assisted hatching are effective strategies to minimize DNA damage.
- These findings support the optimization of vitrification protocols for improved ART outcomes.
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