Because the overexpression of CELF1 (Koshelev et al, 2010) and the loss of MBNL1 (Lee et al, 2013) also result in DCM in mice, Drosophila appears well‐suited to assessing the impact of reduced miR‐1 in DM1‐associated DCM. This evidence concerns the gene MBNL1 and myotonic dystrophy type 1.