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. Here, TNNT2 is linked to atrial fibrillation.