Islet autoantibody seroconversion in the DPT-1 study: Justification for repeat screening throughout childhood

Kendra Vehik, Michael J. Haller, Craig A. Beam, Desmond A. Schatz, Diane K. Wherrett, Jay M. Sosenko, Jeffrey P. Krischer

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


OBJECTIVE - Although type 1 diabetes autoimmunity frequently begins in childhood, little is known about the relationship between age and autoimmunity development. Our aim was to determine the timing of seroconversion to diabetes-associated autoantibody (DAA) positivity and risk in first- and second-degree relatives of patients with type 1 diabetes. RESEARCH DESIGN AND METHODS - Study subjects were identified through the Diabetes Prevention Trial-Type 1 (DPT-1). Children 3-18 years of age (n = 42,447) were screened for DAAs; 1,454 were ICA positive (≥10 JDF units), 1,758 were GAD65 positive, and 899 were ICA512 positive at the time of initial screening. Subjects who were initially antibody negative (n = 39,212) were recalled for rescreening, and 11,813 returned for rescreening. RESULTS - DAA seroconversion occurred in 469 (4%) children; 258 seroconverted to ICA, 234 to GAD65, and 99 to ICA512. The median time to seroconversion was 2 years. The 2-year risk for DAAs was highest in early childhood. For each 1-year increase in age in this cohort, the risk of any autoantibody seroconversion (HR 0.95, 95% CI 0.92-0.97) decreased by 5%, and for any two autoantibodies risk decreased by 13% (0.87, 0.82-0.93). CONCLUSIONS - Risk of autoantibody seroconversion among children followed in DPT-1 is age dependent. Younger children have the highest risk for DAAs, with the majority of children seroconverting by 13 years of age (75%). This suggests that annual screenings should be started in early childhood and continued through early adolescence to identify themajority of subjects at risk for type 1 diabetes and eligible for prevention trials.

Original languageEnglish (US)
Pages (from-to)358-362
Number of pages5
JournalDiabetes care
Issue number2
StatePublished - Feb 2011

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Advanced and Specialized Nursing


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