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- Title
Genetic Variants Contribute to Phenotypic Heterogeneity of Type 1 Diabetes.
- Authors
Redondo, Maria J.; Geyer, Susan; Steck, Andrea K.; Sosenko, Jay; Anderson, Mark; Antinozzi, Peter; Michels, Aaron; Wentworth, John; Ping Xu; Pugliese, Alberto; Xu, Ping; Type 1 Diabetes TrialNet Study Group
- Abstract
<bold>Objective: </bold>The phenotypic diversity of type 1 diabetes suggests heterogeneous etiopathogenesis. We investigated the relationship of type 2 diabetes-associated transcription factor 7 like 2 (TCF7L2) single nucleotide polymorphisms (SNPs) with immunologic and metabolic characteristics at type 1 diabetes diagnosis.<bold>Research Design and Methods: </bold>We studied TrialNet participants with newly diagnosed autoimmune type 1 diabetes with available TCF7L2 rs4506565 and rs7901695 SNP data (n = 810; median age 13.6 years; range 3.3-58.6). We modeled the influence of carrying a TCF7L2 variant (i.e., having 1 or 2 minor alleles) on the number of islet autoantibodies and oral glucose tolerance test (OGTT)-stimulated C-peptide and glucose measures at diabetes diagnosis. All analyses were adjusted for known confounders.<bold>Results: </bold>The rs4506565 variant was a significant independent factor of expressing a single autoantibody, instead of multiple autoantibodies, at diagnosis (odds ratio [OR] 1.66 [95% CI 1.07, 2.57], P = 0.024). Interaction analysis demonstrated that this association was only significant in participants ≥12 years old (n = 504; OR 2.12 [1.29, 3.47], P = 0.003) but not younger ones (n = 306, P = 0.73). The rs4506565 variant was independently associated with higher C-peptide area under the curve (AUC) (P = 0.008) and lower mean glucose AUC (P = 0.0127). The results were similar for the rs7901695 SNP.<bold>Conclusions: </bold>In this cohort of individuals with new-onset type 1 diabetes, type 2 diabetes-linked TCF7L2 variants were associated with single autoantibody (among those ≥12 years old), higher C-peptide AUC, and lower glucose AUC levels during an OGTT. Thus, carriers of the TCF7L2 variant had a milder immunologic and metabolic phenotype at type 1 diabetes diagnosis, which could be partly driven by type 2 diabetes-like pathogenic mechanisms.
- Subjects
PHENOTYPES; TYPE 1 diabetes; TRANSCRIPTION factors; SINGLE nucleotide polymorphisms; DIAGNOSIS of diabetes; ALLELES; COMPARATIVE studies; DISEASE susceptibility; GENETIC polymorphisms; GENETICS; LONGITUDINAL method; RESEARCH methodology; MEDICAL cooperation; PROTEINS; RESEARCH; EVALUATION research
- Publication
Diabetes Care, 2018, Vol 41, Issue 2, p311
- ISSN
0149-5992
- Publication type
journal article
- DOI
10.2337/dc17-0961