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The HNF4A R76W mutation causes atypical dominant Fanconi syndrome in addition to a β cell phenotype
  1. Alexander J Hamilton1,2,
  2. Coralie Bingham1,2,
  3. Timothy J McDonald1,
  4. Paul R Cook3,
  5. Richard C Caswell1,
  6. Michael N Weedon1,
  7. Richard A Oram1,
  8. Beverley M Shields1,
  9. Maggie Shepherd1,
  10. Carol D Inward4,
  11. Julian P Hamilton-Shield4,5,
  12. Jürgen Kohlhase6,
  13. Sian Ellard1,
  14. Andrew T Hattersley1
  1. 1Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, Devon, UK
  2. 2Renal Unit, Royal Devon and Exeter NHS Foundation Trust, Exeter, Devon, UK
  3. 3University Hospital Southampton NHS Foundation Trust, Southampton, Hampshire, UK
  4. 4Bristol Royal Hospital for Children, Bristol, UK
  5. 5UBHT Education Centre, University of Bristol, Bristol, UK
  6. 6Center for Human Genetics, Freiburg, Germany
  1. Correspondence to Professor Andrew T Hattersley, NIHR Clinical Research Facility, University of Exeter Medical School, Barrack Road, Exeter, Devon EX2 5DW, UK; a.t.hattersley{at}exeter.ac.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.

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

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 3.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/3.0/

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