Does NPHS1 polymorphism modulate P118l mutation in NPHS2?

Area of Science:

• Pediatric Nephrology
• Genetics
• Molecular Biology

Background:

• Nephrotic syndrome (NS) in the first year of life is uncommon and presents as a heterogeneous group of disorders.
• Mutations in the NPHS2 gene are associated with NS, typically manifesting between birth and 6 years of age.

Observation:

• A 4-month-old infant presented with steroid-resistant NS.
• This patient carried a polymorphism in the NPHS1 gene (E117K) and a mutation in the NPHS2 gene (P118L).

Findings:

• The patient exhibited a poor prognostic NPHS2 mutation.
• The presence of a polymorphic NPHS1 mutation (E117K) alongside the NPHS2 mutation raises questions about its potential role as a genetic modifier.

Implications:

• Investigating the E117K NPHS1 polymorphism's effect on podocyte signaling pathways is crucial.
• This case highlights the complexity of genetic factors in early-onset nephrotic syndrome and suggests potential genetic modifiers.