sábado, 5 de noviembre de 2016

Divergent phenotypes in siblings with identical novel mutations in the HNF-1α gene leading to maturity onset diabetes of the young type 3 | BMC Medical Genetics | Full Text

Divergent phenotypes in siblings with identical novel mutations in the HNF-1α gene leading to maturity onset diabetes of the young type 3 | BMC Medical Genetics | Full Text

Biomed Central

BMC Medical Genetics

Divergent phenotypes in siblings with identical novel mutations in the HNF-1α gene leading to maturity onset diabetes of the young type 3

  • Birgit Knebel,
  • Susanne Mack,
  • Jutta Haas,
  • Mona Kathrin Herman-Friede,
  • Simone Lange,
  • Oliver Schubert,
  • Jorg Kotzka and
  • Dirk Muller-WielandEmail author
BMC Medical GeneticsBMC series – open, inclusive and trusted201617:36
DOI: 10.1186/s12881-016-0297-z
Received: 20 August 2015
Accepted: 15 April 2016
Published: 4 May 2016

Abstract

Background

Maturity onset diabetes of the young (MODY) is an autosomal dominant form of non–insulin-dependent diabetes mellitus caused by mutations in at least 13 different genes. The hepatocyte nuclear factor (HNF)-gene is affected in the most common form (HNF1A-MODY [MODY3]).

Case presentation

We describe the co-inheritance of a novel heterozygous missense mutation c.1761C > G (p.Pro588Ala) with a novel complex deletion insertion mutation (c.1765_1766delinsGCCCGfs86*) in the HNF-1α gene among affected members of one family. Both mutations were present in the affected patients and neither was present in unaffected family members. The family had not only inheritance of MODY but also increased susceptibility to type 2 diabetes. Therefore one family member had classical type 2 diabetes including metabolic syndrome aggravated by a genetic predisposition in the form of HNF1A-MODY.

Conclusion

The presence of common type 2 diabetes features should not detract from the possibility of MODY in patients with a striking autosomal-dominant family history.

Keywords

Maturity-onset diabetes of the young HNF1A-MODY HNF-1α Metabolic syndrome Metabolic challenge Phenotype variety

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