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Official publication of the Indian Society of Nephrology
 
CASE REPORT
Ahead of Print

A rare genetic mutation in a stone former


1 Department of Nephrology, Government Stanley Medical College, Chennai, Tamil Nadu, India
2 Department of Medical Biochemistry, Taramani campus, University of Madras, Chennai, Tamil Nadu, India

Correspondence Address:
Periandavan Kalaiselvi,
Department of Medical Biochemistry, Taramani Campus, University of Madras, Chennai - 600 113, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijn.IJN_366_19

A 30-year-old woman with history of passage of stones since childhood presented with oliguria and pedal edema for 10 days. She had hypertension with a creatinine of 4.1 mg/dL. Evaluation showed presence of bilateral multiple renal calculi with features of chronicity of kidney disease. Metabolic work-up for nephrolithiasis turned out to be negative and eventually renal biopsy revealed features of chronic interstitial nephritis with greenish brown refractile crystals in the tubular lumen and interstitium. The possibility of dihydroxy adenine crystalline nephropathy was considered. Spectrophotometry of RBC lysates revealed decreased activity of Adenine phosphoribosyl-transferase enzyme. Gene amplification by PCR and sequential analysis identified a missense mutation in exon 3 region of APRT gene in the patient and her family members. This case report highlights the need to contemplate the diagnosis of DHA crystalline nephropathy in young patients with nephrolithiasis and the identification of a rare genetic mutation, which is being reported for the first time in India.


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Indian Journal of Nephrology
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Online since 20th Sept '07