The characteristic hematological features of DBA include a severe normochromic macrocytic anemia, reticulocytopenia, isolated erythroid hypoplasia in the bone marrow, and an increased erythrocyte adenosine deaminase (eADA) [5], erythrocyte “i” antigen, and fetal hemoglobin (Hb) [6]. The gene discussed is GSTM1; the disease is Reticulocytopenia.