Phenotype Spectrum in Tunisian Population with NPHP1 Deletion

Overview

Journal Indian J Nephrol

Specialty Nephrology

Date 2024 Jan 4

PMID 38174310

Authors

Yousra Hammi

Maryem Ferjani

Rym Meddeb

Rania Kacem

Taha Sayari

Ridha Mrad

Tahar Gargah

Affiliations

Soon will be listed here.

Abstract

Introduction: Nephronophthisis (NPHP) is a tubulointerstitial kidney disorder with an autosomal recessive inheritance pattern. Its genetic heterogeneity contributes to phenotype variability. The most frequent etiology of juvenile nephronophthisis is a mutation in the nephronophthisis type 1 () gene. This study aimed to evaluate the genotype-phenotype correlation in gene mutation.

Methods: A multicenter retrospective study was performed over 20 years from 1998 to 2018 to describe the clinical, biological, and radiological features associated with the large deletion gene in 32 patients.

Results: The incidence of NPHP1 was 1.6/204041. Eighty-one percent of our patients were born out of consanguineous marriages. The mean age at diagnosis was 14 ± 7 years. The patients were divided into three groups: isolated nephronophthisis (72%), syndromic nephronophthisis (19%), and patients without recognizable syndrome (9%). Intrafamilial and geographical variability was observed in syndrome diagnoses and in age at the onset of CKD stage 5. Genotype frequency varied between 50% and 100% in genealogical data. Juvenile (47%), adolescent (37%), and adult (13%) clinical forms have been distinguished by the onset of CKD stage 5. The five-year survival rate of renal transplantation was 80%.

Conclusion: Given the broad clinical spectrum of NPHP1 associated with the large deletion of the gene, no genotype-phenotype correlation could be established.

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