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Typical type 2 diabetes mellitus and HFE gene mutations: a population-based case - control study
David J Halsall1, Ian McFarlane, Jian'an Luan
1Department of Clinical Biochemistry, Addenbrooke's NHS Trust, Cambridge CB2 2QR, UK. djh44@hermes.cam.ac.uk
Human Molecular Genetics
|June 5, 2003
Summary
Hereditary hemochromatosis can lead to diabetes. This study found no evidence that common HFE gene mutations are more frequent in type 2 diabetes patients, indicating genetic screening for HFE mutations is not beneficial.
Area of Science:
- Genetics and Endocrinology
- Metabolic Diseases
- Iron Metabolism Disorders
Background:
- Diabetes mellitus is a known complication of hereditary hemochromatosis.
- The association between common HFE mutations (C282Y, H63D) and increased iron indices with diabetes requires clarification.
- Previous studies on HFE allele frequencies in diabetic populations have yielded controversial results.
Purpose of the Study:
- To investigate the frequency of C282Y and H63D HFE mutations in a large cohort of type 2 diabetes mellitus patients.
- To conduct a meta-analysis of existing studies examining HFE mutations in type 2 diabetes.
- To determine the clinical utility of screening for HFE mutations in individuals with type 2 diabetes.
Main Methods:
- Case-control study analyzing C282Y and H63D HFE allele frequencies in type 2 diabetes patients (onset >30 years, no early insulin requirement).
- Meta-analysis combining data from this study with all previously published similar studies.
- Statistical analysis to assess the over-representation of HFE mutations in the diabetic population.
Main Results:
- The largest case-control study found no significant over-representation of C282Y or H63D HFE alleles in type 2 diabetes mellitus.
- The meta-analysis confirmed the lack of association between iron-loading HFE alleles and type 2 diabetes.
- No evidence supports a genetic link between common HFE mutations and the development of type 2 diabetes.
Conclusions:
- Common HFE mutations are not over-represented in patients with type 2 diabetes mellitus.
- Screening for HFE mutations (C282Y, H63D) is not recommended for individuals diagnosed with type 2 diabetes.
- The findings suggest that hereditary hemochromatosis-related iron overload is not a significant factor in the pathogenesis of typical type 2 diabetes.