In viral myocarditis, ADAR1 p150 plays a key role in complexing with Dicer and promoting the expression of miRNA-222, the latter of which suppresses the expression of the target gene phosphatase-and-tensin (PTEN), which acts as a mediator of several cellular events including apoptosis, cell survival, proliferation, and migration [33]. The gene discussed is PTEN; the disease is viral myocarditis.