Several genes related to asthma are regulated by epigenetic mechanism such as genes involved in T-effector pathways (Interferon INF-γ, Ιnterleukin (IL)-4, IL-13 and IL-17), T-regulatory pathways (forkhead box P3 [FoxP3]) and airway inflammation (arginase [ARG])12. The gene discussed is IL13; the disease is asthma.