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Familial hypomagnesemia with hypercalciuria and nephrocalcinosis, a genetic kidney disorder, can present with early-onset renal failure. This case highlights a novel CLDN16 mutation and associated congenital anomalies.

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Area of Science:

  • Nephrology
  • Genetics
  • Pediatrics

Background:

  • Familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHN) is an autosomal recessive renal tubular disorder.
  • It is characterized by renal magnesium wasting, hypercalciuria, nephrocalcinosis, and progressive renal failure, caused by mutations in the CLDN16 gene.

Observation:

  • Presents a unique case of FHHN in a patient with a homozygous truncating CLDN16 gene mutation (W237X).
  • This patient exhibited early-onset renal insufficiency despite diagnosis at two months old.
  • The case is notable for additional congenital abnormalities, including horseshoe kidney, neonatal teeth, atypical facial features, and cardiac defects.

Findings:

  • Identifies a homozygous W237X mutation in the CLDN16 gene as the cause of FHHN.
  • Demonstrates early-onset renal insufficiency and severe phenotypes in FHHN.
  • Reports the youngest diagnosed case of FHHN with a spectrum of congenital anomalies not previously associated with the disease.

Implications:

  • Suggests CLDN16 mutations can lead to severe early-onset renal failure and diverse congenital anomalies.
  • Highlights the importance of early genetic diagnosis for FHHN.
  • Broadens the understanding of the phenotypic spectrum associated with CLDN16 mutations in renal tubular disorders.