Porcine conceptus Oct-4 mRNA expression during peri-implantation development

Area of Science:

• Reproductive Biology
• Developmental Biology
• Genetics

Background:

• Octamer-binding transcription factor 4 (OCT-4) regulates pluripotent cells during early development in various species.
• Unlike in mice, OCT-4 is found in both the inner cell mass and trophoblast in bovine and porcine species.
• Delayed OCT-4 downregulation in farm animals might relate to extended peri-implantation periods.

Purpose of the Study:

• To investigate OCT-4 mRNA expression in pig conceptuses during peri-implantation development (days 10-17).
• To understand the role of OCT-4 in early pregnancy establishment in pigs.

Main Methods:

• Total RNA extraction from pig conceptuses collected on days 10, 12, 13, 15, and 17 of gestation.
• Quantitative reverse transcription polymerase chain reaction (RT-PCR) to measure OCT-4 mRNA levels.

Main Results:

• OCT-4 mRNA expression in pig conceptuses was significantly affected by the day of development (p < 0.001).
• Expression was highest on days 10 and 12, approximately 7.7- and 11.6-fold greater than on days 15 and 17, respectively.
• A significant decrease in OCT-4 mRNA was observed from day 12 to day 15.

Conclusions:

• OCT-4 mRNA expression declines significantly during porcine peri-implantation development.
• Downregulation of OCT-4 appears critical for trophoblast expansion and uterine attachment in pigs.
• This suggests OCT-4 plays a key role in establishing pregnancy in this species.