Progesterone-regulated changes in endometrial gene expression contribute to advanced conceptus development in cattle

Area of Science:

• Reproductive Biology
• Animal Science
• Genomics

Background:

• Elevated progesterone (P4) concentrations post-ovulation correlate with enhanced pregnancy success in cattle.
• Understanding how P4 influences the uterine environment is crucial for improving reproductive outcomes.

Purpose of the Study:

• To investigate the impact of elevated progesterone on endometrial gene expression in early pregnant cattle.
• To identify specific genes and pathways regulated by P4 that support conceptus development.

Main Methods:

• Synchronized heifers were assigned to high P4 or normal P4 groups after insemination.
• Progesterone supplementation was administered via intravaginal devices from Day 3 to Day 7.
• Endometrial tissue was collected at multiple time points (Days 5, 7, 13, 16) and analyzed using bovine microarrays.

Main Results:

• The most significant changes in gene expression occurred when P4 profiles differed the longest.
• Key genes like DGAT2 and MSTN (GDF8) showed increased expression, linked to triglyceride synthesis and glucose transport for embryonic energy.
• P4 supplementation altered the timing and duration of expression for genes crucial to histotroph composition.

Conclusions:

• Progesterone supplementation advances endometrial gene expression patterns during early pregnancy in cattle.
• Altered gene expression, particularly for energy metabolism and nutrient supply genes, supports conceptus development.
• This provides a molecular basis for how P4 enhances reproductive efficiency in cattle.