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J Med Genet. 2014 Mar;51(3):165-9. doi: 10.1136/jmedgenet-2013-102066. Epub 2013 Nov 27.

The HNF4A R76W mutation causes atypical dominant Fanconi syndrome in addition to a β cell phenotype.

Author information

  • 1Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, Devon, UK.

Abstract

BACKGROUND:

Mutation specific effects in monogenic disorders are rare. We describe atypical Fanconi syndrome caused by a specific heterozygous mutation in HNF4A. Heterozygous HNF4A mutations cause a beta cell phenotype of neonatal hyperinsulinism with macrosomia and young onset diabetes. Autosomal dominant idiopathic Fanconi syndrome (a renal proximal tubulopathy) is described but no genetic cause has been defined.

METHODS AND RESULTS:

We report six patients heterozygous for the p.R76W HNF4A mutation who have Fanconi syndrome and nephrocalcinosis in addition to neonatal hyperinsulinism and macrosomia. All six displayed a novel phenotype of proximal tubulopathy, characterised by generalised aminoaciduria, low molecular weight proteinuria, glycosuria, hyperphosphaturia and hypouricaemia, and additional features not seen in Fanconi syndrome: nephrocalcinosis, renal impairment, hypercalciuria with relative hypocalcaemia, and hypermagnesaemia. This was mutation specific, with the renal phenotype not being seen in patients with other HNF4A mutations. In silico modelling shows the R76 residue is directly involved in DNA binding and the R76W mutation reduces DNA binding affinity. The target(s) selectively affected by altered DNA binding of R76W that results in Fanconi syndrome is not known.

CONCLUSIONS:

The HNF4A R76W mutation is an unusual example of a mutation specific phenotype, with autosomal dominant atypical Fanconi syndrome in addition to the established beta cell phenotype.

KEYWORDS:

Calcium and Bone; Clinical Genetics; Diabetes; Metabolic Disorders; Renal Medicine

PMID:
24285859
[PubMed - in process]
PMCID:
PMC3932761
Free PMC Article

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