Ehlers-Danlos Syndrome, Classic Type, 1, also known as ehlers-danlos syndrome, type i, is related to ehlers-danlos syndrome, classic type, 2 and ehlers-danlos syndrome, vascular type. An important gene associated with Ehlers-Danlos Syndrome, Classic Type, 1 is COL5A1 (Collagen Type V Alpha 1 Chain), and among its related pathways/superpathways are Phospholipase-C Pathway and PI3K-Akt signaling pathway. Affiliated tissues include skin and bone marrow, and related phenotypes are cigarette-paper scars and recurrent lower respiratory tract infections