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Summary  Molecular alterations of the transcription factor hepatocyte nuclear factor 1B (HNF1B) are associated with systemic disease, with kidney disease and maturity-onset diabetes of the young (MODY) as the most characteristic manifestations. Other features comprise pancreatic exocrine insufficiency, liver and biliary anomalies, and genital tract malformations. HNF1B-associated disease is clinically heterogeneous, and therefore the diagnosis is challenging. The authors describe the case of a 19-year-old man with new-onset diabetes after kidney transplantation (NODAT). The kidney disease presented during fetal life as bilateral hyperechogenic kidneys. Renal function progressively deteriorated during childhood, and at the age of 19, the patient was submitted to a living-kidney transplant. Two weeks after transplant, NODAT developed. Given the young age and normal body weight, NODAT was unexpected, and the possibility of HNF1B-associated disease was considered. Screening for mutations in  HNF1B  was undertaken, and a known mutation was found. As this case highlights, HNF1B-associated disease should be considered when NODAT unexpectedly develops in young kidney transplant recipients with a suggestive renal disease.    Learning points:     HNF1B  anomalies are associated with systemic disease, including kidney disease, diabetes mellitus, pancreatic exocrine insufficiency, liver test abnormalities and genital tract malformations.    Phenotype is variable and there are no pathognomonic manifestations, but kidney disease appears to be the most common feature and diabetes the most frequent extra-renal phenotype.    Spontaneous gene alterations are common, and the lack of family history should not exclude the diagnosis.     HNF1B  defects should be considered when NODAT develops in a young adult kidney transplant recipient with a suggestive kidney disease and without extensive risk factors for diabetes.    The most appropriate treatment for HNF1B-associated diabetes is not established, but immunosuppressive therapy superimposed on a beta-cell dysfunction seems to determine the need for insulin therapy after a variable period.    Immunosupressive regimens free of calcineurin inhibitors should be considered in patients with HNF1B-associated disease to minimize the risk of developing NODAT.

New-onset diabetes after kidney transplantation revealing HNF1B-associated disease