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- W2023247669 abstract "The tyrosine phosphatase-like protein IA-2 is a major target antigen for autoantibodies in the preclinical period of type 1 diabetes. In this study, we examined whether immunoglobulin isotypes and IgG subclass specific autoantibodies directed at IA-2 discriminate between children at risk of type 1 diabetes who progressed to diabetes vs. those who remained diabetes-free. IgG1-4, IgA and the IgE-specific IA-2 antibody (IA-2A) were measured by radioligand assays in 50 patients with type 1 diabetes and 41 ICA-positive siblings of patients with type 1 diabetes who were followed for diabetes development. Of 41 siblings, 32 were positive for IA-2A; of these, 59 % had IA-2 IgG1, 59 % IgG4, 16 % IgG3, 9 % IgG2, 16 % IgA and 13 % IgE antibodies. IA-2 IgG1 was the dominant isotype in prediabetic children (n = 14, 86 % positive) and patients with type 1 diabetes (98 % positive) whereas only 7 of 18 (39 %) non-progressors had antibodies of this isotype. In subjects that remained diabetes-free, a significantly higher frequency of IA-2 IgG4 in the absence of IgG1 was observed (50 %) compared to progressors (7 %) and patients with type 1 diabetes (0 %). Life-table analysis revealed that IA-2A restricted to IgG4 correlated with protection from type 1 diabetes (p < 0.003). In contrast, IA-2 IgG2, IgG3, IgE and IgA did not differ significantly between study groups. Our findings suggest that the measurement of IA-2 IgG1 and IgG4 subclass antibodies can serve as surrogate marker to discriminate between antibody positive subjects at high or low risk for rapid development of diabetes." @default.
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- W2023247669 date "2002-04-01" @default.
- W2023247669 modified "2023-09-26" @default.
- W2023247669 title "IA-2 Autoantibodies Restricted to the IgG4 Subclass are Associated with Protection from Type 1 Diabetes" @default.
- W2023247669 doi "https://doi.org/10.1055/s-2002-26708" @default.
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