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Temporal changes in the frequencies of HLA genotypes in patients with type 1 diabetes–indication of an increased environmental pressure?
Open accessAbstract
Aims/hypothesis The incidence of Type 1 diabetes has increased 2.5 times during the time period from 1966 to 2000 in Finland-a general trend seen in almost all developed countries that can only be explained by environmental factors. The aim of this study was to test the possible effect of a changing environment on distribution of genotypes associated with disease susceptibility.Methods HLA DRB1-DQA1-DQB1 genes and two diabetes-associated polymorphisms at IDDM2 and IDDM12 were analyzed. The frequencies of genotypes were compared between cases diagnosed with childhood-onset Type 1 diabetes during the period of 1939-1965 (n=367) and those diagnosed between 1990 and 2001 (n=736). Chi-square statistics or the Fisher's Exact test were used for the comparison of frequencies of analyzed haplotypes and genotypes in the two groups.Results The frequencies of (DR3) -DQA1*05-DQB1*02 and (DR4) -DQB1*0302 risk haplotypes and the high risk (DR3) -DQA1*05-DQB1*02/DRB1*0401-DQB1*0302 genotype were higher while proportion of patients carrying protective haplotypes-(DR15) -DQB1*0602 and (DR1301) -DQB1*0603-or protective genotypes was lower in patients diagnosed before 1965 as compared to those who developed disease after 1990. No temporal variation was found in the frequencies of genotypes at IDDM2 and IDDM12.Conclusion/interpretation Our data suggest that the need for genetic susceptibility to develop Type 1 diabetes has decreased over time due to an increasing environmental pressure and this results in a higher disease progression rate especially in subjects with protective HLA genotypes.
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“Furthermore, they note recent studies17–19 demonstrate environmental factors have a stronger effect on individuals with lower risk genotypes as compared to those at higher risk genetically.”
From Epidemiology of type 1 diabetes (2010) · cites this paper as [17]
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Metadata
- Authors
- the FinnDiane Study Group, Hermann, R., Knip, M., Veijola, R., Simell, O., Laine, A.-P., Åkerblom, H. K., Groop, P.-H., Forsblom, C., Pettersson-Fernholm, K., & Ilonen, J.
- Affiliations
- University of Turku (FI)
- University of Helsinki (FI)
- University of Oulu (FI)
- Corresponding author
- Hermann, R.
- Venue
- Diabetologia
- Published
- 2003-03
- Volume
- 46
- Issue
- 3
- Pages
- 420-425
- ISSN
- 0012-186X (ISSN-L)
- 1432-0428
- OpenAlex
- W1662039682
- Cited by
- 245
- References
- 26
- Citations by year
- 2025: 5 · 2024: 12 · 2023: 6 · 2022: 9 · 2021: 12 · 2020: 2 · 2019: 8 · 2018: 6 · 2017: 10 · 2016: 11 · 2015: 8 · 2014: 16 · 2013: 16 · 2012: 20
- FWCI
- 5.40
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Diabetologia (publishedVersion)
- PubMed (publishedVersion)
- Funders
- European Foundation for the Study of Diabetes
- Academy of Finland
- Novo Nordisk
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Keywords
- type 1 diabetes, HLA genotypes, genetic susceptibility, environmental factors, temporal trends, childhood-onset diabetes, disease incidence, disease progression
- MeSH terms
- Child, Diabetes Mellitus, Type 1, Environment, Female, Finland, Gene Frequency, Genotype, HLA Antigens, HLA-DQ Antigens, HLA-DR Antigens, Humans, Male, Polymorphism, Genetic, Time Factors
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