Indeed, since cases of juvenile osteoporosis have been ascribed to inactivating mutations of the type 1 collagen (COL1A1), ERalpha (ERα), aromatase (CYP19), and low-density lipoprotein receptor-related protein 5 (LRP5) genes, the sequencing of these genes can be performed. The gene discussed is CYP19A1; the disease is idiopathic juvenile osteoporosis.