Uterine differentiation as a foundation for subsequent fertility.

Area of Science:

• Reproductive Biology
• Developmental Biology
• Comparative Mammalian Anatomy

Background:

• Uterine differentiation initiates prenatally but completes postnatally in cattle and sheep.
• Mechanisms governing uterine development are not fully understood, but epigenetic regulation via microenvironmental interactions is implicated.
• Neonatal steroid exposure can induce lasting changes in the adult uterus, impacting its function.

Purpose of the Study:

• To investigate the effects of specific steroidal agents on uterine development during neonatal periods in cattle and sheep.
• To determine the functional consequences of targeted neonatal steroid exposure on the adult uterus.
• To identify critical developmental mechanisms and determinants of uterine integrity and function.

Main Methods:

• Utilizing murine models to understand epigenetic regulation in urogenital tract development.
• Administering specific steroidal agents during defined neonatal periods in cattle and sheep.
• Creating extreme adult uterine phenotypes (lesion models) through strategic postnatal steroid exposure.

Main Results:

• Transient postnatal steroid exposure can lead to immutable changes in adult uterine tissues.
• These alterations may affect the embryotrophic potential of the uterine environment.
• Neonatal steroid exposure can dictate the functional potential of the adult uterus.

Conclusions:

• Postnatal steroid-sensitive events are critical for uterine growth, development, and adult function.
• Extreme uterine phenotypes in livestock serve as valuable models for studying uterine function and identifying novel genes.
• Further research can identify critical developmental mechanisms and determinants of uterine integrity and function.