FTO and atrial fibrillation: To verify whether Kcne1 overexpression could rescue the increased susceptibility to AF that may be resulting from Fto overexpression, 2‐month‐old male mice were intravenously injected with AAV9‐cTnT‐Fto‐oe, with or without AAV9‐cTnT‐Kcne1‐oe.