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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Islet cell antibody frequency differs from that of glutamic acid decarboxylase antibodies/ IA2 antibodies after diagnosis of diabetes.

The combination of glutamic acid decarboxylase (GAD) 65 antibodies (GADA) and protein tyrosine phosphatase-like protein IA2 antibodies (IA2-ab), measured by radioligand binding assays, has been suggested to replace islet cell antibodies (ICA), measured by indirect immunofluorescence, as a marker for autoimmune type I diabetes. The aim of this study was to compare the frequency of ICA and GADA and/or IA2-ab not only at, but also after the diagnosis of diabetes. ICA, GADA and IA2-ab were therefore assessed at and up to 11 y after the diagnosis of diabetes in 86 children (1-15-y-old). At diagnosis, ICA were found in 74 (86%) and GADA and/or IA2-ab in 79 (92%) of the diabetic children. Hence, there was no major difference in frequency between ICA and GADA and/or IA2-ab at diagnosis of diabetes. At follow-up, however, ICA were less frequent than GADA and/or IA2-ab; 1-3 y after diagnosis ICA were found in 12 (44%) and GADA and/or IA2-ab in 24 (89%) of 27 children (p=0.001); 4-6 y after diagnosis ICA were found in 7 (24%) and GADA and/or IA2-ab in 27 (93%) of 29 children (p < 0.0001); 7-11 y after diagnosis ICA were found in 4 (13%) and GADA and/or IA2-ab in 21 (70%) of 30 children (p < 0.0001). We conclude that the frequency of ICA does not always correspond to that of GADA and/or IA2-ab. Many years after diagnosis of diabetes, measurements of GADA and IA2-ab, but not ICA, detect autoimmunity in high frequency.[1]


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