Phenocopies of HCM include Anderson-Fabry disease (galactosidase alpha, GLA), Danon disease (lysosomal-associated membrane protein 2, LAMP2), PRKAG2 related glycogen storage disease (protein kinase AMP-activated non-catalytic subunit gamma 2, PRKAG2), cardiac amyloidosis, neuromuscular diseases and malformation syndromes (Noonan spectrum syndromes).[6] Genetic diagnostics has proven as an effective strategy to differentiate between potential underlying causes and to rule out phenocopies. The gene discussed is GLA; the disease is Glycogen storage disease due to glycogenin deficiency.