Declaration: Novel SLC3A1 mutation in a cystinuria patient with xanthine stones: a case report

Author:

Bai Peide,Zhang WenZhao,Lai Longhui,Huang Haichao,Qin Jiaxuan,Duan Bo,Wang Huiqiang,Chen Yuedong,Jia Yuanyuan,Xing Jinchun,Wang Tao,Chen Bin

Abstract

Abstract Background Cystinuria and xanthinuria are both rare genetic diseases involving urinary calculi. However, cases combining these two disorders have not yet been reported. Case Presentation In this study, we report a case of cystinuria with xanthine stones and hyperuricemia. The 23-year-old male patient was diagnosed with kidney and ureteral stones, solitary functioning kidney and hyperuricemia after admission to the hospital. The stones were removed by surgery and found to be composed of xanthine. Conclusion Genetic testing by next-generation sequencing technology showed that the patient carried the homozygous nonsense mutation c.1113 C> A (p.Tyr371*) in the SLC3A1 gene, which was judged to be a functionally pathogenic variant. Sanger sequencing revealed that the patient’s parents carried this heterozygous mutation, which is a pathogenic variant that can cause cystinuria. The 24-h urine metabolism analysis showed that the cystine content was 644 mg (<320 mg/24 h), indicating that the patient had cystinuria, consistent with the genetic test results. This case shows that cystinuria and xanthine stones can occur simultaneously, and provides evidence of a possible connection between the two conditions. Furthermore, our findings demonstrate the potential value of genetic testing using next-generation sequencing to effectively assist in the clinical diagnosis and treatment of patients with urinary calculi.

Funder

natural science foundation of china

fujian provincial department of science and technology

medical and health guidance project of xiamen

Publisher

Springer Science and Business Media LLC

Subject

Urology,Reproductive Medicine,General Medicine

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