Expression data showing downregulation of AMPK regulator PRKAG3 could be indicative of altered glycogen storage, with glycogen storage disease and PRKAG2 (isoform of PRKAG3) mutation seen in some cases of cardiomyopathy (Porto et al. 2016; Banankhah et al. 2018). Here, PRKAG2 is linked to Glycogen storage disease due to glycogenin deficiency.