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Granulomatous nephropathy: have you thought about genetics?
Enzo Vedrine1, Lucie Bessenay2, Carole Philipponnet3
1Service de Néphrologie, Centre de Référence Des Maladies Rénales Rares, Filières de Santé Maladies Rares ORKID Et ERKNet, Hôpital Édouard-Herriot, Hospices Civils de Lyon, Lyon, France. enzo.vedrine@chu-lyon.fr.
This case study reveals a rare instance of granulomatous nephropathy linked to nephronophthisis (NPHP) in a teenager. Genetic testing confirmed NPHP, emphasizing its role in early-onset kidney disease.
Area of Science:
- Nephrology
- Genetics
- Pediatric Medicine
Background:
- Chronic kidney disease (CKD) in adolescents presents diagnostic challenges.
- Tubulointerstitial nephropathy with granulomas is a rare finding.
- Nephronophthisis (NPHP) is a genetic kidney disorder often presenting in childhood.
Purpose of the Study:
- To report a unique case of granulomatous nephropathy associated with NPHP.
- To highlight the importance of genetic testing in diagnosing pediatric kidney diseases.
- To emphasize considering NPHP in early-onset inflammatory and granulomatous nephropathies.
Main Methods:
- Case report of a 16-year-old female with CKD.
- Kidney biopsy revealing tubulointerstitial nephropathy with granulomas.
- Exome sequencing for genetic analysis, identifying NPHP1 gene deletion.
Main Results:
- Diagnosis of nephronophthisis (NPHP) confirmed via homozygous NPHP1 gene deletion.
- The patient presented with severe, early-onset kidney damage.
- Initial immunosuppressive therapy was ineffective, necessitating dialysis and transplantation.
Conclusions:
- Nephronophthisis should be considered in cases of inflammatory and granulomatous nephropathy, particularly in young patients.
- Genetic testing is crucial for accurate diagnosis and management of pediatric nephropathies.
- This case represents a unique presentation of granulomatous disease secondary to NPHP.
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