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Update on cystinuria
Nicola Sumorok1, David S Goldfarb
1Nephrology Section, New York Harbor VA Healthcare System, and Nephrology Division, New York University School of Medicine, New York, New York, USA.
Purpose Of Review:
Cystinuria is a rare genetic disease with increased urinary excretion of the poorly soluble amino acid cystine. It can lead to significant morbidity in affected patients due to the often large and recurrent resulting kidney stones. Treatment is focused on the prevention of stone formation. There have been few advances in the available therapeutic options for the disorder in the last 15-20 years.
Recent Findings:
Although no new treatments have emerged in the prevention of cystinuria in recent years, several developments hold promise for advancing the field of caring for affected patients. A new method of measuring urinary cystine and estimating potential for stone formation, called cystine capacity, may prove to be a useful tool in monitoring the disease. The discoveries of the mutations that cause cystinuria have led to a new classification system based on genotype that is more accurate than the prior phenotypic one. The finding of new compounds that inhibit cystine crystal growth in vitro, now being tested in animal models, may lead to new potential therapies in years to come. The Rare Kidney Stone Consortium has developed a registry and hopes to lead further efforts in dealing with cystinuria.
Summary:
With several recent advances in the monitoring and treatment of cystinuria, and the gathering of clinical patient data, there are now opportunities for new management protocols and therapies.
Insights
Cystinuria, a rare genetic kidney stone disease, has seen recent advances in monitoring and classification. New compounds show promise for future therapies, offering hope for improved patient management.
Area of Science:
- Nephrology
- Genetics
- Rare Diseases
Background:
- Cystinuria is a rare genetic disorder characterized by increased urinary cystine excretion.
- This leads to recurrent, large kidney stones, causing significant patient morbidity.
- Current treatment focuses on preventing stone formation, with limited therapeutic advances in recent decades.
Purpose of the Study:
- To review recent developments in the monitoring and treatment of cystinuria.
- To highlight promising advancements for improved patient care and management protocols.
Main Methods:
- Review of recent literature and clinical findings in cystinuria research.
- Analysis of new diagnostic tools and therapeutic compound discoveries.
- Examination of advancements in disease classification and patient data collection.
Main Results:
- A new method, 'cystine capacity,' aids in monitoring urinary cystine and stone risk.
- Genotype-based classification offers improved accuracy over previous phenotypic systems.
- In vitro studies identify compounds that inhibit cystine crystal growth, progressing to animal models.
- The Rare Kidney Stone Consortium is establishing a patient registry for further research.
Conclusions:
- Recent progress in cystinuria monitoring and treatment offers new avenues for management.
- The development of novel therapies and improved diagnostic tools is anticipated.
- Gathering clinical data is crucial for establishing new and effective management protocols.
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