Kidney-Urinary Tract Involvement in Intermediate Junctional Epidermolysis Bullosa

Area of Science:

• Medical Genetics
• Dermatology
• Nephrology

Background:

• Kidney-urinary tract (KUT) manifestations are a significant cause of morbidity in junctional epidermolysis bullosa (JEB).
• The spectrum of KUT disease severity and clinical course in JEB patients remain poorly understood.

Purpose of the Study:

• To investigate KUT manifestations, diagnostic and therapeutic approaches, genotype-phenotype correlations, and outcomes in a large cohort of intermediate JEB patients.
• To establish a basis for recommendations, prognosis, and management strategies for KUT involvement in JEB.

Main Methods:

• Retrospective, longitudinal case series of 99 intermediate JEB patients over 18 years.
• Data extracted from medical records included clinical, laboratory, and molecular genetic parameters.
• Analysis of KUT manifestations, management, and genotype-phenotype correlations.

Main Results:

• 15% of JEB patients (99/183) had intermediate JEB with KUT involvement; prevalence was higher in males (30%).
• Mean age of KUT onset was 6.9 years, with a median follow-up of 13 years.
• KUT complication severity correlated with the affected protein (laminin 332 or integrin β4), not skin involvement extent.

Conclusions:

• Increased awareness of KUT risks in intermediate JEB is crucial for physicians and patients.
• Interdisciplinary and individualized diagnostic and therapeutic approaches are recommended for managing KUT complications.
• Multicenter studies are needed due to the rarity of JEB for developing general recommendations.