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Genes, environment and Oji-Cree type 2 diabetes
Robert A Hegele1, Bernard Zinman, Anthony J G Hanley
1Robarts Research Institute (RAH, HC), London, ON, Canada. hegele@robarts.ca
Clinical Biochemistry
|May 3, 2003
Summary
A specific HNF1A gene mutation (G319S) significantly increases type 2 diabetes risk in Canadian Oji-Cree. This genetic factor, discovered through targeted sequencing, strongly predicts disease onset and impacts protein function, though environmental factors also play a role.
Area of Science:
- Genetics
- Endocrinology
- Population Health
Background:
- Type 2 diabetes prevalence is exceptionally high in the Canadian Oji-Cree population.
- Understanding the genetic underpinnings of this epidemic is crucial for developing targeted interventions.
Purpose of the Study:
- To identify genetic determinants contributing to type 2 diabetes and related metabolic traits in the Canadian Oji-Cree.
- To investigate the role of a specific HNF1A gene mutation (G319S) in disease susceptibility and onset.
Main Methods:
- Candidate gene sequencing was employed to identify genetic variations.
- In vitro functional assays were performed to assess the impact of the identified mutation on protein function.
- Statistical modeling, including sigmoidal modeling, was used to analyze the association between the G319S mutation and diabetes onset age.
Main Results:
- A private G319S mutation in the HNF1A gene was identified as a significant genetic determinant.
- The HNF1A G319S mutation demonstrated high specificity (97%) and positive predictive value (95%) for type 2 diabetes by age 50.
- The G319S mutation impaired HNF1A protein function in vitro and accelerated median diabetes onset by approximately 7 years per allele dose.
- Environmental factors were found to accelerate diabetes onset more significantly than the G319S mutation.
Conclusions:
- The HNF1A G319S mutation is a key genetic risk factor for type 2 diabetes in the Canadian Oji-Cree.
- The discovery highlights the importance of candidate gene sequencing for identifying private mutations missed by genome-wide approaches.
- Findings suggest that while genetics play a role, environmental modifications may offer significant potential for mitigating the diabetes epidemic in this population.