Developmental potential of biopsied mouse blastocysts.

Area of Science:

• Embryology
• Developmental Biology
• Reproductive Science

Background:

• Preimplantation embryo health is crucial for successful pregnancy.
• Cellular biopsy of early embryos is a technique explored for diagnostic purposes.
• Trophectoderm cells contribute to implantation and early embryonic development.

Purpose of the Study:

• To evaluate the impact of trophectoderm cell biopsy on mouse blastocyst in vitro implantation.
• To assess the effect of biopsy on early egg cylinder formation.
• To determine the viability and developmental potential of biopsied blastocysts.

Main Methods:

• Mouse blastocysts were cultured in vitro after hCG administration.
• Hatching was induced or occurred spontaneously.
• Trophectoderm cells were removed using micromanipulation.
• Embryo viability was assessed using FDA staining.
• In vitro implantation and egg cylinder formation were evaluated.

Main Results:

• Biopsy of trophectoderm cells from hatching blastocysts impaired in vitro implantation.
• Zona pellucida shedding and implantation rates were reduced post-biopsy.
• Biopsy of polar trophectoderm cells significantly decreased the number of embryos reaching the egg cylinder stage.
• FDA staining indicated reduced viability in biopsied embryos.

Conclusions:

• Trophectoderm cell biopsy negatively affects the implantation potential and early development of mouse blastocysts.
• The extent of impairment is notable, especially when polar trophectoderm cells are targeted.
• These findings highlight potential risks associated with embryonic cell biopsy in assisted reproductive technologies.