Recurrent exercise-induced acute kidney injury by idiopathic renal hypouricemia with a novel mutation in the SLC2A9 gene and literature review

BMC Pediatrics

Lizhong Du²  Qiang Shu²  Ai’min Liu²  Weizhong Gu¹  Haidong Fu²  Jianhua Mao²  Xia Jin²  Chunyue Feng²  Huijun Shen² 

[1] Department of Pathology, The Children’s Hospital of Zhejiang University School of Medicine, Hangzhou 310003, China;Department of Nephrology, The Children’s Hospital of Zhejiang University School of Medicine, Hangzhou 310003, Zhejiang Province, China

关键词: Gene mutation;    SLC2A9;    Acute kidney injury;    Idiopathic renal hypouricemia;   

Others  :  1138959
DOI  :  10.1186/1471-2431-14-73

 received in 2013-11-25, accepted in 2014-03-06,  发布年份 2014

【 摘 要 】

Background

Idiopathic renal hypouricemia (iRHUC) is an autosomal recessive hereditary disorder, characterized by impaired tubular uric acid transport, re-absorption insufficiency and/or the acceleration of secretions. Some patients present with severe complications, such as exercise-induced acute kidney injury (EIAKI) and nephrolithiasis.

Case presentation

Herein, we report the case of a girl with severe iRHUC (serum urate 0.05 mg/dL, fractional excretion of uric acid 295.99%) associated with recurrent EIAKI, in whom the disease was caused by a homozygous mutation (g.68G > A in exon 3) in the SLC2A9 gene. Her family members (father, mother and brother) carried the same mutation but were heterozygous, without any signs of severe hypouricemia.

Conclusions

Our findings indicate that iRHUC is a rare disorder but that it should also be considered in patients with EIAKI, especially in those patients who manifest with moderately elevated or normal serum concentrations of uric acid during the acute phase of AKI. Mutational screening of the SLC2A9 gene is necessary for the diagnosis of iRHUC, and homozygous mutations of the SLC2A9 alleles can cause severe hypouricemia. Careful attention should be paid to any signs of hypouricemia during the recovery phase of AKI and long-term follow-up.

【 授权许可】

   
2014 Shen et al.; licensee BioMed Central Ltd.

【 图 表 】

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