Low C3 in a 4-month-old baby: is it a problem?

Area of Science:

• Nephrology
• Genetics
• Pediatric Medicine

Background:

• Familial history of chronic kidney disease (CKD) is a significant risk factor.
• Membranoproliferative glomerulonephritis and C3 glomerulopathy are progressive kidney diseases.
• Early diagnosis and intervention are critical for managing inherited kidney disorders.

Purpose of the Study:

• To investigate the genetic basis of kidney disease in a pediatric patient with a family history of CKD.
• To identify potential genetic mutations contributing to low serum C3 levels in an infant.
• To emphasize the role of early genetic screening in at-risk populations.

Main Methods:

• Clinical exome analysis was performed to identify genetic variations.
• Serum C3 levels and kidney function tests were analyzed.
• Family history of kidney disease was documented.

Main Results:

• A heterozygous mutation in the CFH gene was identified in the patient.
• The same mutation was found in homozygous form in an affected uncle.
• The patient presented with normal kidney function but low serum C3 levels.

Conclusions:

• The CFH gene mutation is implicated in the familial kidney disease.
• Early genetic screening can detect predispositions to kidney disease even with normal initial test results.
• Proactive identification of at-risk individuals is vital for preserving kidney function and improving outcomes.