Ozdemir, F; Oygar, DD; Behlul, A; Ataç, S; Bardak, S; Yükseliş, M; Papagregoriou, G; ... Gurkan, C; + view all Ozdemir, F; Oygar, DD; Behlul, A; Ataç, S; Bardak, S; Yükseliş, M; Papagregoriou, G; Malatras, A; Gale, DP; Neild, GH; Deltas, C; Gurkan, C; - view fewer (2025) Familial Kidney Disease Phenocopying Hypertensive Nephropathy. Glomerular Diseases , 5 (1) pp. 233-242. 10.1159/000546094.

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Abstract

INTRODUCTION: Familial kidney disease is common in Cyprus and previous studies have found that the majority of families have mutations in Alport syndrome genes COL4A3/4/5. We have collected data from over 50 Turkish Cypriot families in whom kidney disease appears to follow an autosomal dominant pattern, and looked for pathological variants in these genes. METHODS: Probands from 55 families underwent massive parallel DNA sequencing using a glomerular gene panel for familial hematuria, and whole-exome sequencing (WES) was also performed in 22 of them. Clinical records were reviewed. RESULTS: Likely pathogenic variants were identified in 7 of the 55 families (COL4A3 [3], COL4A4 [2], and COL4A5 [2]), leaving 48 unsolved families. Among the latter a common missense variant of uncertain significance (COL4A4:p.G545A), was present in 5 families (9.1%). In contrast to families with a pathogenic variant in COL4A3/4 and a clear glomerular phenotype the 5 families (54 patients with clinical and genetic data), manifested near dominant susceptibility with incomplete penetrance, presenting with hypertension, variable and intermittent microscopic hematuria, and minimal proteinuria, <1 g/day until the estimated glomerular filtration rate (eGFR) fell below 30 mL/min, after which it increased in some individuals. Of those over age 50, 20% had reached end-stage by median age of 66 (48-80) years. CONCLUSIONS: We describe a kidney disease with mild hypertension that is more characteristic of a tubulointerstitial disease and phenocopies hypertensive nephropathy. While the variant COL4A4:p.G545A is not responsible for a Mendelian CKD phenotype, it appears to increases the susceptibility, acting as a hypomorphic variant contributing to Alport spectrum nephropathy. Early detection and treatment with ACE inhibitors should prolong kidney survival to an age where hemodialysis is avoided.

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