This study analyzed the association of CTLA-4-318C/T gene polymorphism with susceptibility, clinical course and laboratory findings of Type 1 diabetes (T1D). One hundred and fifty-three T1D patients and 189 healthy controls entered this study. CTLA-4-318C/T genotyping was performed by tetra-primer amplification refractory mutation system-polymerase chain reaction (T-ARMS-PCR) analysis. The allelic and genotypic frequencies of -318C/T gene polymorphism were similar in patients and controls. However, younger age, earlier age at onset, higher HbA1c levels, higher frequency of Glutamic acid decarboxylase antibodies (GADA) and Insulinoma Associated-2 Autoantibodies (IA-2A) were observed in T1D patient carriers of CT genotype. The current study demonstrates that although CTLA-4-318C/T polymorphism was not linked with a higher genetic risk for T1D, the presence of a CT genotype was associated with a younger age of onset, poor control of HbA1c level and positive anti-GAD or IA-2 serum autoantibodies in Iranian Azeri population.
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