Maturity-Onset Diabetes of the Young (MODY) is a monogenic form of diabetes, consisting of a heterogeneous group of
autosomal dominant inherited disorders. This study included 63 non obese patients having early onset of non immunogenic
diabetes with strong family history of diabetes selected from diabetic patients attended the specialized center of
endocrinology and diabetes at Alrusafa/ Baghdad during period from the begging of October 2011 till the end of May
2013.The sequence analysis of the exon 4 hepatocyte nuclear factor 1A gene reported for the first time in Iraq the presence
of monogenic diabetes (maturity onset diabetes of the young type 3) as major cause of diabetes within non obese diabetic
patients early onset of non immunogenic diabetes with strong family history of diabetes.