Further investigations did not reveal any signs of autoimmunity with negative anti-glutamic acid decarboxylase (GAD) antibodies (GAD; 0.2 U/mL, RR:<0.9) and antibodies against tyrosine phosphatase-related islet cell antigen 2 (IA-2; <0.1 U/mL, RR<0.75), while cardiologic, ophthalmologic and neurologic examinations revealed normal findings. The gene discussed is GAD1; the disease is Autoimmunity.