Neutral lipid storage disease (< 1/1000000, ORPHA155): This rare non-lysosomal lipid storage disorder is caused by defects in two triglyceride-associated proteins: adipose triglyceride lipase, encoded by the gene "patatin-like phospholipase domain-containing 2" (PNPLA2); and "alpha/ß-hydrolase domain-containing protein 5", encoded by the ABHD5 gene, also called "comparative gene identification-58". Here, PNPLA2 is linked to Lipid storage disease.