For example, increasing evidence suggests that the DNMT3B -149C>T polymorphism, either alone or in haplotype combination with other non-coding DNMT3B polymorphisms, contributes to the maternal risk for having a child with Down syndrome [47,48,49], and has been associated with an increased risk of prematurity [30], with childhood immune thrombocytopenia [50,51] and autoimmune thyroid disease [52]. The gene discussed is DNMT3B; the disease is autoimmune thrombocytopenic purpura.