Genetic and clinical characteristics of patients with HNF1A gene variations from the German-Austrian DPV database

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Item Type:	Article
Title:	Genetic and clinical characteristics of patients with HNF1A gene variations from the German-Austrian DPV database
Creators Name:	Awa, W.L., Thon, A., Raile, K., Grulich-Henn, J., Meissner, T., Schober, E. and Holl, R.W.
Abstract:	OBJECTIVE: To determine prevalence, genetic and phenotype characteristics of patients with hepatocyte nuclear factor-1alpha (HNF1A) variants in the Diabetes Patienten Verlaufsdokumenation (DPV) multicentre database and to examine the influence of HNF1A mutation type, or location on clinical phenotypes. PATIENTS AND METHODS: Seventy-one DPV patients were labelled as HNF1A-MODY (MODY3). Forty-four patients carried HNF1A mutations, while 27 patients were found to have HNF1A polymorphisms only. Associations between mutation type/position and age at disease onset, HbAlc, body mass index (BMI), diagnosis, family history and treatment modality were analysed using non-parametric statistics (Wilcoxon test). RESULTS: Patients with HNF1A mutations were 36% male, aged 14.1+/-5.8 years at diagnosis, and slightly overweight (BMI-SDS: +0.8+/-1.1). Treatment was lifestyle intervention (20.5%), insulin (35.3%), oral anti-diabetic (OAD, 43%) and both insulin+OAD (15.9%). More patients with missense mutations (60%) than patients with nonsense mutations/frameshift (23.8%) did not use insulin (P=0.03). No differences were found with regard to mutation types, isoform or domain. We identified several previously undescribed mutations in the cohort including c.-158insGGGTTGG in the promoter region, G31X, E41X, Q130X, L162P, R245I, A269P, S355X, Q398X, Q473X, Q495X, E508X, P588fs-insGCCA and P588fs-delAC. Patients carrying HNF1A polymorphisms were significantly younger at diagnosis than patients with HNF1A mutations (10.9+/-4.2 vs 14.19+/-5.8 years; P=0.027), and all carried I27L, S487N and A98V (n=3). CONCLUSION: HNF1A-MODY is the second most frequent MODY diagnosis registered in the DPV database, and previously undescribed HNF1A mutations account for about one-third of HNF1A-MODY cases. Patients with HNF1A polymorphisms documented as HNF1A-MODY were misclassified. They may have autoantibody-negative type 1B or type 2 diabetes or may have other MODY types.
Keywords:	Diabetes Mellitus Type 2, European Continental Ancestry Group, Frameshift Mutation, Genetic Polymorphism, Genetic Predisposition to Disease, Hepatocyte Nuclear Factor 1-alpha, Missense Mutation
Source:	European Journal of Endocrinology
ISSN:	0804-4643
Publisher:	BioScientifica
Volume:	164
Number:	4
Page Range:	513-520
Date:	April 2011
Official Publication:	https://doi.org/10.1530/EJE-10-0842
PubMed:	View item in PubMed

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