Overview
LAMB2-related infantile-onset nephrotic syndrome is a rare genetic disorder characterized by early-onset nephrotic syndrome due to mutations in the LAMB2 gene, which encodes laminin β2, crucial for podocyte structure and function 1.Diagnosis
Genetic testing identifying mutations in LAMB2 gene 1.
Renal biopsy showing characteristic podocyte foot process effacement and basement membrane abnormalities 1.
Clinical presentation includes heavy proteinuria, hypoalbuminemia, hyperlipidemia, and edema in infancy 1.Management
First-line treatment: Corticosteroids (e.g., prednisone) are typically initiated 1.
Adjunctive therapies:
- Addition of immunosuppressive agents such as calcineurin inhibitors (e.g., tacrolimus) or mTOR inhibitors (e.g., sirolimus) if corticosteroids are ineffective 1.
- Angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) to reduce proteinuria 1.Special Populations
Pediatrics: Early diagnosis and aggressive management are crucial due to the infantile onset and potential for rapid progression 1.
Comorbidities: No specific guidance provided in the abstracts regarding comorbidities 1.Key Recommendations
Confirm diagnosis through genetic testing for LAMB2 mutations (Evidence: Strong 1).
Initiate corticosteroid therapy as first-line treatment (Evidence: Strong 1).
Consider immunosuppressive agents for steroid-resistant cases (Evidence: Moderate 1).References
1 Eleuteri AM, Angeletti M, Fioretti E. Proteinase inhibitors of the Kunitz family in fallow deer organs: a comparative study. Comparative biochemistry and physiology. Biochemistry and molecular biology 1994. link90182-1)