Epispadias and the associated embryopathies: genetic and developmental basis

Area of Science:

• Developmental biology
• Genetics
• Urology

Background:

• Urogenital organ abnormalities, including rare epispadias, are significant human developmental diseases.
• Epispadias, a dorsal cleft of external genitalia, can extend to the urethra and is frequently associated with ventral body wall and bladder defects, forming the bladder exstrophy and epispadias complex (BEEC).

Purpose of the Study:

• To review local interactions and developmental regulators involved in external genitalia and body wall development.
• To introduce mutant mouse models that exhibit external genitalia-body wall abnormalities to understand pathogenic mechanisms.

Main Methods:

• Analysis of genetic interactions between growth factors (e.g., bone morphogenetic proteins - Bmp) and transcription factors (e.g., Msx1/2, Isl1).
• Investigation of the role of epithelial-mesenchymal interaction (EMI) in development.
• Examination of mutant mouse models with external genitalia and body wall defects.

Main Results:

• Genetic interactions involving Bmp, Msx1/2, and Isl1 are implicated in external genitalia and body wall organogenesis.
• Epithelial-mesenchymal interaction (EMI) plays a significant role during development.
• Mutant mouse models provide insights into the mechanisms underlying these complex malformations.

Conclusions:

• Understanding the genetic and molecular mechanisms, particularly involving EMI, is crucial for addressing bladder exstrophy and epispadias complex (BEEC).
• Mutant mouse models are essential tools for dissecting the pathogenesis of these rare congenital anomalies and identifying responsible genes.