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In Vivo Visualization of Calcium Transients during Fertilization and Early Development in C. elegans
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Superovulation Does Not Alter Calcium Oscillations Following Fertilization
Virginia Savy1, Paula Stein1, Min Shi2
1Reproductive and Developmental Biology Laboratory, Durham, NC, United States.
Frontiers in Cell and Developmental Biology
|November 22, 2021
Summary
Superovulation protocols may cause subtle changes in egg calcium signaling after parthenogenetic activation, but do not affect calcium signaling during fertilization. This supports superovulation
Area of Science:
- Reproductive Biology
- Developmental Biology
- Cellular Physiology
Background:
- Superovulation maximizes egg yield for assisted reproduction and research.
- Supraphysiological gonadotropins promote follicle development but may impact egg quality.
- Calcium oscillations are crucial for successful embryo development.
Purpose of the Study:
- To investigate the impact of superovulation on egg calcium signaling capacity.
- To determine if superovulation affects calcium oscillations critical for embryo development.
Main Methods:
- Eggs were collected from superovulated and naturally cycling mice.
- Eggs were parthenogenetically activated or fertilized in vitro.
- Calcium oscillatory patterns were monitored in both conditions.
Main Results:
- Parthenogenetically activated superovulated eggs showed minor delays and longer first transients.
- No significant differences in oscillation persistence, frequency, or total calcium signal were observed after parthenogenetic activation.
- Superovulated eggs fertilized in vitro exhibited no differences in calcium oscillatory behavior compared to controls.
Conclusions:
- Superovulation does not disrupt physiological calcium signaling during fertilization.
- Subtle calcium signaling differences post-parthenogenetic activation do not impede fertilization success.
- Superovulation remains a viable method for egg retrieval in clinical and experimental settings.
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