Cystinuria Genetics and Management Strategies
Summary
Cystinuria is an inherited disorder of renal tubular transport characterised by defective reabsorption of the dibasic amino acids cystine, ornithine, lysine and arginine. Two principal genes, SLC3A1 and SLC7A9, encode subunits of the b0,+ transporter in proximal tubules and account for the majority of cases. Mutations in these genes lead to elevated urinary cystine concentrations, supersaturation and recurrent stone formation from childhood onwards. Clinical management hinges on vigorous fluid intake to dilute cystine, urinary alkalisation to enhance solubility and thiol-binding agents that form more soluble mixed disulphides. Dietary modifications, including reduced sodium and animal protein intake, further attenuate stone risk. Despite established regimens, stone recurrences remain frequent, renal function may decline over time, and patient adherence is often challenging. Recent advances in molecular diagnostics are refining genotype–phenotype correlations and enabling earlier identification of at-risk individuals. Complementary approaches that probe cystine crystal nucleation and novel biomarkers of renal injury or inflammation promise to inform precision management. Integration of genetic profiles with tailored alkalisation and chelation strategies is gradually shifting practice towards personalised care, with the dual aims of preventing stone episodes and preserving long-term renal function.
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Cystinuria Genetics and Management Strategies publication trend
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Technical terms
Cystinuria: A hereditary defect in renal reabsorption of cystine and other dibasic amino acids leading to stone formation.
Supersaturation: A state in which urinary cystine concentration exceeds its solubility limit, precipitating crystal nucleation.
Alkalisation: The therapeutic increase of urinary pH to enhance cystine solubility and reduce stone risk.
Thiol-binding agents: Drugs that form mixed disulphides with cystine, yielding more soluble compounds to prevent crystallisation.
Genotype–phenotype correlation: The relationship between specific genetic variants and clinical manifestations, used to predict disease severity and optimise management.
References
- Cystine crystal nucleation and decay in the context of cystinuria pathogenesis and treatment. RSC Advances (2024).
- Effect of urine alkalization on urinary inflammatory markers in cystinuric patients. Clinical Kidney Journal (2024).
- Clinical Course and Mutational Analysis of Patients with Cystine Stone: A Single-Center Experience. Biomedicines (2023).
- Cystinuria: an inborn cause of urolithiasis. Orphanet Journal of Rare Diseases (2012).
- Associating mutations causing cystinuria with disease severity with the aim of providing precision medicine. BMC Genomics (2017).
- The Impact of Diet on Urinary Risk Factors for Cystine Stone Formation. Nutrients (2021).
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