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Cystinuria: a new genetic variant

A D Stephens, D Perrett

    Clinical Science and Molecular Medicine
    |July 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study reports a family with a rare form of cystinuria, a kidney stone disorder. The affected individuals show abnormal cystine reabsorption, suggesting a unique genetic defect in amino acid transport.

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    Area of Science:

    • Nephrology
    • Medical Genetics
    • Biochemistry

    Background:

    • Cystinuria is a hereditary disorder characterized by the formation of cystine renal stones due to defective renal tubular reabsorption of dibasic amino acids.
    • The condition is typically classified into different types based on genetic inheritance patterns and biochemical findings.

    Observation:

    • A family presented with an unusual manifestation of cystinuria.
    • The primary individual (propositus) had a cystine renal stone and markedly impaired renal tubular reabsorption of cystine.
    • Other dibasic amino acids, including ornithine, lysine, and arginine, showed only a mild reduction in reabsorption.

    Findings:

    • One offspring of the propositus excreted excessive amounts of cystine and lysine.
    • This excretion pattern is characteristic of heterozygotes for type II cystinuria.

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  • The observed renal transport defect may represent an extreme variant within the spectrum of cystinuria or a distinct condition resembling isolated hypercystinuria.

    • Implications:

    • This case expands the understanding of the genetic and biochemical variability of cystinuria.
    • It highlights the potential for novel mutations affecting amino acid transport in the kidneys.
    • Further research is warranted to elucidate the specific molecular mechanisms underlying this rare form of cystinuria and its inheritance.