Cited by 417Diabetes and associated disordersGenetic Associations and EpidemiologyDiabetes Management and Research

Frequency and phenotype of type 1 diabetes in the first six decades of life: a cross-sectional, genetically stratified survival analysis from UK Biobank

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Thomas, Nicholas J, Jones, Samuel E, Weedon, Michael N, Shields, Beverley M, Oram, Richard A, Hattersley, Andrew T·2018·The Lancet Diabetes & Endocrinology

Abstract

Background Type 1 diabetes is typically considered a disease of children and young adults. Genetic susceptibility to young-onset type 1 diabetes is well defined and does not predispose to type 2 diabetes. It is not known how frequently genetic susceptibility to type 1 diabetes leads to a diagnosis of diabetes after age 30 years. We aimed to investigate the frequency and phenotype of type 1 diabetes resulting from high genetic susceptibility in the first six decades of life. Methods In this cross-sectional analysis, we used a type 1 diabetes genetic risk score based on 29 common variants to identify individuals of white European descent in UK Biobank in the half of the population with high or low genetic susceptibility to type 1 diabetes. We used Kaplan-Meier analysis to evaluate the number of cases of diabetes in both groups in the first six decades of life. We genetically defined type 1 diabetes as the additional cases of diabetes that occurred in the high genetic susceptibility group compared with the low genetic susceptibility group. All remaining cases were defined as type 2 diabetes. We assessed the clinical characteristics of the groups with genetically defined type 1 or type 2 diabetes. Findings 13 250 (3·5%) of 379 511 white European individuals in UK Biobank had developed diabetes in the first six decades of life. 1286 more cases of diabetes were in the half of the population with high genetic susceptibility to type 1 diabetes than in the half of the population with low genetic susceptibility. These genetically defined cases of type 1 diabetes were distributed across all ages of diagnosis; 537 (42%) were in individuals diagnosed when aged 31–60 years, representing 4% (537/12 233) of all diabetes cases diagnosed after age 30 years. The clinical characteristics of the group diagnosed with type 1 diabetes when aged 31–60 years were similar to the clinical characteristics of the group diagnosed with type 1 diabetes when aged 30 years or younger. For individuals diagnosed with diabetes when aged 31–60 years, the clinical characteristics of type 1 diabetes differed from those of type 2 diabetes: they had a lower BMI (27·4 kg/m 2 [95% CI 26·7–28·0] vs 32·4 kg/m 2 [32·2–32·5]; p<0·0001), were more likely to use insulin in the first year after diagnosis (89% [476/537] vs 6% [648/11 696]; p<0·0001), and were more likely to have diabetic ketoacidosis (11% [61/537] vs 0·3% [30/11 696]; p<0·0001). Interpretation Genetic susceptibility to type 1 diabetes results in non-obesity-related, insulin-dependent diabetes, which presents throughout the first six decades of life. Our results highlight the difficulty of identifying type 1 diabetes after age 30 years because of the increasing background prevalence of type 2 diabetes. Failure to diagnose late-onset type 1 diabetes can have serious consequences because these patients rapidly develop insulin dependency. Funding Wellcome Trust and Diabetes UK.

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Authors
Thomas, N. J., Jones, S. E., Weedon, M. N., Shields, B. M., Oram, R. A., & Hattersley, A. T.
Affiliations
University of Exeter (GB)
Corresponding author
Hattersley, Andrew T
Venue
The Lancet Diabetes & Endocrinology
Publisher
Elsevier BV
Published
2018-02
Volume
6
Issue
2
Pages
122-129
ISSN
2213-8587 (ISSN-L)
OpenAlex
W2774874882
Cited by
417
References
27
Citations by year
2026: 41 · 2025: 49 · 2024: 33 · 2023: 43 · 2022: 51 · 2021: 61 · 2020: 52 · 2019: 45 · 2018: 41 · 2017: 1
FWCI
25.17
Type
journal article
Language
en
Open access
Locations
  • The Lancet Diabetes & Endocrinology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Open Research Exeter (University of Exeter) (publishedVersion, cc-by)
  • Figshare (submittedVersion)
  • Royal Devon and Exeter Research Repository (Royal Devon and Exeter) (submittedVersion, cc-by)
Funders
  • Wellcome Trust (098395/Z/12/Z)
  • National Institute for Health and Care Research (CL-2015-23-001, NF-SI-0611-10219, NF-SI-0616-10080)
  • Medical Research Council (MC_PC_15047)
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, adult-onset type 1 diabetes, genetic susceptibility, polygenic risk score, type 2 diabetes, age at diagnosis, clinical phenotype, body mass index, insulin use, UK Biobank, survival analysis, genetic stratification
MeSH terms
Adult, Aged, Cross-Sectional Studies, Diabetes Mellitus, Type 1, Female, Genotype, United Kingdom, Humans, Male, Middle Aged, Phenotype, Time Factors, Prevalence, Survival Rate, Databases, Factual, Biological Specimen Banks, Genetic Predisposition to Disease

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