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Genotype and Phenotype Analysis in Pediatric Patients with Cystinuria

Ji Hyun Kim1, Eujin Park1, Hye Sun Hyun1

  • 1Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea.

Journal of Korean Medical Science
|January 4, 2017
PubMed

Insights

Cystinuria, a kidney disorder, shows varied genetic causes in Korean children. Early onset was linked to non-SLC3A1 mutations, with all patients experiencing kidney stones.

Area of Science:

  • Nephrology
  • Genetics
  • Pediatric Medicine

Background:

  • Cystinuria is an inherited renal disorder causing cystine and dibasic amino acid malabsorption.
  • This defect leads to nephrolithiasis (kidney stone formation).
  • Understanding genetic and clinical features is crucial for managing pediatric cases.

Purpose of the Study:

  • To investigate the genotypes and phenotypes of pediatric cystinuria patients in Korea.
  • To identify specific mutations in genes SLC3A1 and SLC7A9.
  • To explore potential genotype-phenotype correlations.

Main Methods:

  • Retrospective analysis of eight pediatric cystinuria patients.
  • Mutational studies using direct sequencing.
  • Clinical data collection including age at onset, diagnosis, follow-up, and complications.

Main Results:

  • Seven patients underwent mutational analysis, revealing biallelic SLC3A1 (AA) in 4, heterozygous SLC3A1 (A-) in 1, biallelic SLC7A9 (BB) in 1, and heterozygous SLC7A9 (B-) in 1.
  • Two novel mutations were identified.
  • No significant genotype-phenotype correlation was observed, except for earlier onset in non-AA genotypes.
  • All patients had recurrent symptomatic nephrolithiasis requiring interventions.
  • Three patients developed mild-to-moderate renal dysfunction.

Conclusions:

  • This study presents the first genotypic and phenotypic analysis of cystinuria in Korean pediatric patients.
  • Genetic variations in SLC3A1 and SLC7A9 are implicated in pediatric cystinuria.
  • Recurrent nephrolithiasis and potential renal dysfunction are significant complications.
  • Further research may clarify genotype-phenotype relationships and inform treatment strategies.

Keywords:
CystinuriaGene mutationGenotypePhenotypeSLC3A1 GeneSLC7A9 Gene

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