A simple, efficient, and scalable method to generate oocyte-like cells in vitro.

Area of Science:

• Reproductive Biology
• Stem Cell Biology
• Developmental Biology

Background:

• Oocyte identity and function are crucial for female fertility, but research is limited by the scarcity of oocytes.
• Existing methods for oocyte research face technical challenges, hindering progress in understanding female infertility.

Purpose of the Study:

• To establish an efficient and scalable method for generating oocyte-like cells in vitro.
• To validate the utility of these in vitro-derived cells for studying oocyte-specific molecular features and gene function.

Main Methods:

• Refinement of existing 3D protocols into a simplified 2D culture system using mouse embryonic stem cells.
• Generation of oocyte-like cells (mini-oocytes) via a transcription factor-mediated approach without supporting somatic cells.
• Transcriptome and proteome analyses to compare in vitro mini-oocytes with in vivo oocytes.

Main Results:

• Successfully generated oocyte-like cells (mini-oocytes) with high efficiency and minimal labor.
• Transcriptome and proteome analyses confirmed significant molecular similarities between mini-oocytes and natural oocytes.
• Demonstrated the application of mini-oocytes in a small-scale knockout screen targeting the subcortical maternal complex.

Conclusions:

• The developed 2D culture method provides a practical and scalable platform for oocyte research.
• Mini-oocytes serve as a valuable model for investigating oocyte biology and gene function, overcoming limitations of using natural oocytes.
• This approach holds promise for advancing research into female infertility and reproductive health.