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Åke Lernmark

Principal investigator

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Species-specific autoantibodies in type 1 diabetes


  • C. S. Hampe
  • E. Örtqvist
  • O. Rolandsson
  • M. Landin-Olsson
  • C. Törn
  • Å Ågren
  • B. Persson
  • D. B. Schranz
  • Å Lernmark

Summary, in English

GAD65 autoantibodies (GAD65Ab) are important markers for type 1 (insulin-dependent) diabetes mellitus. Although most patients have GAD65Ab at the time of clinical diagnosis, there are also GAD65Ab-positive individuals in the population at low risk of developing type 1 diabetes. The aim of this study was to test the hypothesis that the GAD65Ab reactivity to GAD65 cloned from human, mouse, and rat in newly diagnosed type 1 diabetic patients differ from antibody-positive healthy individuals. Sera from 254 new-onset 0- to 34- yr-old type 1 diabetic patients and 270 controls were assayed for their reactivity to human, mouse, and rat GAD65. Among the type 1 diabetic patients there was a significant better binding of human GAD65 compared to either mouse (P = 0.03) or rat GAD65 (P = 0.0005). The preference for human GAD65 increased with increasing age at onset (P = 0.0002). This differentiation was not observed in 88 GAD65Ab-positive control subjects. Our data indicate that recognition of epitopes by GAD65Ab in type 1 diabetes is different from that in nontype 1 diabetes, GAD65Ab-positive individuals.

Publishing year







Journal of Clinical Endocrinology and Metabolism





Document type

Journal article


Oxford University Press


  • Endocrinology and Diabetes




  • ISSN: 0021-972X