Procedure for rapid oocyte selection based on quantitative analysis of cumulus cell gene expression

Area of Science:

• Reproductive Biology
• Molecular Biology
• Genetics

Background:

• Cumulus cells play a crucial role in oocyte development and fertilization potential.
• Selecting the best oocytes for in vitro fertilization (IVF) remains a challenge.
• Gene expression analysis in cumulus cells offers a potential method for oocyte selection.

Purpose of the Study:

• To establish a rapid and reliable method for analyzing gene expression in human cumulus cells.
• To identify optimal RNA extraction and reverse transcription procedures for this purpose.
• To enable the selection of viable oocytes for fertilization based on gene expression profiles.

Main Methods:

• Evaluation of five RNA extraction methods and three reverse transcription procedures.
• Utilizing Real-time quantitative PCR (qPCR) for gene expression analysis.
• Testing a single-step mRNA quantification kit for comparison.

Main Results:

• Two RNA extraction kits demonstrated superior efficiency and purity.
• One reverse transcription procedure exhibited the best speed and efficiency.
• A single-step kit proved unsuitable due to high biological material requirements from individual cumulus oocyte complexes (COCs).

Conclusions:

• A combined RNA extraction and reverse transcription protocol allows for the measurement of 5 cumulus cell transcripts within 4 hours.
• This optimized procedure reliably quantified gene expression in 44 out of 46 individual COCs.
• The developed method facilitates improved oocyte selection for enhanced fertilization outcomes.