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Heterozygous cystinuria and urinary lithiasis.

R Giugliani, I Ferrari, L J Greene

    American Journal of Medical Genetics
    |December 1, 1985
    PubMed
    Summary
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    Heterozygosity for cystinuria (II or III) increases the risk of forming urinary stones. Detectable heterozygotes were found more frequently in stone-forming individuals, suggesting a complex mechanism for stone formation.

    Area of Science:

    • Genetics
    • Nephrology
    • Urology

    Background:

    • Cystinuria is a recessively inherited disorder affecting amino acid transport.
    • Mutations in cystinuria genes lead to high urinary concentrations of cystine and other amino acids.
    • Heterozygotes for certain cystinuria alleles (+/II, +/III) can exhibit increased urinary amino acid levels.

    Purpose of the Study:

    • To determine the frequency of +/II and +/III heterozygotes in Brazil.
    • To evaluate the association between heterozygous cystinuria and urinary stone formation (urolithiasis).

    Main Methods:

    • Screening of urine samples from 5,150 individuals (5,000 non-stone-forming, 150 stone-forming).
    • Utilized cyanide-nitroprusside test, thin-layer amino acid chromatography, and ion-exchange chromatography.

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  • Compared heterozygote frequencies between stone-forming and non-stone-forming groups.

    • Main Results:

    • 32 heterozygotes (+/II or +/III) were detected.
    • The frequency of detectable heterozygotes was significantly higher in stone-forming individuals (1:25) than in non-stone-forming individuals (1:104).
    • No significant differences in urinary cystine levels or urolithiasis characteristics were found between stone-forming and non-stone-forming heterozygotes.

    Conclusions:

    • Heterozygosity for +/II and +/III cystinuria is a risk factor for urinary stone formation.
    • The tendency for stone formation in heterozygotes likely involves complex, multifactorial mechanisms.
    • Further research is needed to elucidate the precise mechanisms linking heterozygous cystinuria to urolithiasis.