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ENGLISH ABSTRACT
JOURNAL ARTICLE
[HNF1B-related disease: paradigm of a developmental gene and unexpected recognition of a new renal disease].
Néphrologie & Thérapeutique 2013 November
HNF1B encodes for a transcription factor involved in the early development of the kidney, pancreas, liver and genital tract. Mutations in HNF1B are dominantly inherited and consist of whole-gene deletion, or small mutation. De novo mutation occurs in half of tested kindreds. HNF1B-related disease combines renal and non-renal manifestations. Renal involvement is heterogeneous and may escape early recognition. During fetal life and childhood, it mostly consists of hyperechogenic kidneys or bilateral renal cystic hypodysplasia. The adult phenotype encompasses tubulointerstitial profile at presentation and slowly progressive renal decline (-2 ml/min/year). Renal involvement includes renal cysts (mostly few cortical cysts), a solitary kidney, pelvi-caliceal abnormalities, hypokalemia and hypomagnesemia related to tubular leak, and more rarely, Fanconi syndrome and chromophobe renal carcinoma. The latter warrants ultrasound screening. Extrarenal phenotype consists of diabetes mellitus (MODY-5), exocrine pancreas failure and pancreas atrophy; fluctuation liver tests abnormalities; diverse genital tract abnormalities in females or infertility in males; and mild mental retardation in rare individuals. Phenotype heterogeneity within families is striking. Individuals progressing to end-stage renal disease are eligible for kidney transplantation (or combined pancreas and kidney transplantation for diabetic individuals). While HNF1B disease was still unknown one decade ago, it has emerged as the second most prevalent dominantly inherited kidney disease. Data available pave the way for early recognition and improved specific management, including genetic counselling.
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