How genomics reclassifies diseases: the case of Alport syndrome.
2020
In this issue, Matthews et al. provide a comprehensive review of published cohorts with heterozygous pathogenic variants in COL4A3 or COL4A4, documenting the wide spectrum of the disease. Due to the extreme phenotypes that patients with heterozygous pathogenic variants in COL4A3 or COL4A4 may show, the disease has been referred to in a variety of ways, including 'autosomal dominant Alport syndrome', 'thin basement membrane disease', 'thin basement membrane nephropathy', 'familial benign hematuria' and 'carriers of autosomal dominant Alport syndrome'. This confusion over terminology has prevented nephrologists from being sufficiently aware of the relevance of the entity. Nowadays, however, next-generation sequencing facilitates the diagnosis and it is becoming a relatively frequent finding in haematuric-proteinuric nephropathies of unknown origin, even in non-familial cases. There is a need to raise awareness among nephrologists about the disease in order to improve diagnosis and provide better management for these patients.
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