| This study analyzed the association of CTLA-4-318C/T gene polymorphism with susceptibility, clinicalcourse and laboratory findings of Type 1 diabetes (T1D). One hundred and fifty-three T1D patients and 189healthy controls entered this study. CTLA-4-318C/T genotyping was performed by tetra-primer ampli-fication refractory mutation system–polymerase chain reaction (T-ARMS–PCR) analysis. The allelic andgenotypic 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 decarboxylaseantibodies (GADA) and Insulinoma Associated-2 Autoantibodies (IA-2A) were observed in T1D patientcarriers of CT genotype. The current study demonstrates that although CTLA-4-318C/T polymorphismwas not linked with a higher genetic risk for T1D, the presence of a CT genotype was associated with ayounger age of onset, poor control of HbA1c level and positive anti-GAD or IA-2 serum autoantibodies inIranian Azeri population. |