In vitro blastocyst development from serially split mouse embryos and future implications for human assisted...

Area of Science:

• Developmental Biology
• Reproductive Science
• Embryology

Background:

• Embryo splitting is a technique used to increase the number of embryos.
• Understanding the efficacy of serial splitting is crucial for optimizing assisted reproductive technologies.

Purpose of the Study:

• To evaluate the efficiency of serial embryo splitting on blastocyst development in mice.
• To determine the optimal number of serial splits for maximizing embryo development.

Main Methods:

• Prospective study involving serial biopsy and splitting of mouse embryos (B6C3F-1 x B6D2F-1) at two-, four-, and six-cell stages.
• Embryos underwent up to three serial splits, with blastocyst development rates assessed after each splitting event.

Main Results:

• First splitting yielded high blastocyst rates (74.3% to 75.0%).
• Second splitting showed reduced rates (62.6% to 71.8%), with further significant decreases after the third split (10.6% to 48.4%).
• Third splitting demonstrated minimal to no advantage for blastocyst development.

Conclusions:

• Serial embryo splitting is effective for blastocyst development up to the second stage.
• Third serial splitting offers no significant benefit and reduces developmental potential.
• This study provides insights into serial embryo splitting in mammals with potential applications in human assisted reproduction.