Abstract：
UNLABELLED:Type 1 diabetes in Sardinia is very common in children, and we hypothesized that Latent Autoimmune Diabetes of Adult (LADA) might constitute a significant proportion of diabetes in adult Sardinian subjects. Since Type 2 diabetes is a familial disorder, we tested this hypothesis by investigating the prevalence of GAD65 and IA-2 autoantibodies (Ab) in Type 2 diabetes multiplex families of Sardinian ancestry enrolled in the Study Group for the Genetics of Diabetes in Sardinia. METHODS:A total of 684 individuals were ascertained from 252 Sardinian Type 2 diabetes multiplex families with 2.4 affected siblings per family comprising 190 families with two affected, 37 with three, 15 with four, 7 with five, and 3 with six, in addition to 80 unaffected siblings. Controls were household contacts representing 204 healthy spouses of affected siblings. Diagnosis was at 35-69 years of age and insulin was not given in the first 4 years after diagnosis. GAD65Ab and IA-2Ab were determined in standard radioligand binding assays. RESULTS:Among affected siblings GAD65Ab were positive in 8.8% of insulin-treated (n = 137; P = 0.0006), in 2.5% of non-insulin-treated (n = 467), and in 1.2% of non-diabetic siblings (n = 80) compared with 0.5% of controls (n = 204). IA-2Ab was positive in 6.6% insulin-treated (P = 0.04), 2.1% non-insulin-treated, and 2.5% non-diabetic siblings compared with 1.5% of controls. CONCLUSION:A high frequency of GAD65Ab and IA-2Ab as markers of Type 1 diabetes was found among Type 2 diabetes siblings from Sardinian multiplex families despite excluding those who had been treated with insulin during the first 4 years of disease. Our data support the hypothesis that LADA may be common in Sardinian Type 2 diabetes and stress the importance of investigating markers of Type 1 diabetes in studies of Type 2 diabetes.
journal_name
Diabetes Res Clin Practjournal_title
Diabetes research and clinical practiceauthors
Maioli M,Tonolo G,Bekris L,Cirillo R,Schranz D,Cossu E,Ciccarese M,Lernmark A,Study Group for the Genetics of Diabetes in Sardina (SGGDS).doi
10.1016/s0168-8227(01)00348-5subject
Has Abstractpub_date
2002-04-01 00:00:00pages
41-7issue
1eissn
0168-8227issn
1872-8227pii
S0168822701003485journal_volume
56pub_type
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