The other gene cluster was located in the network of “fibroblast” (top 30), which contains KLK5, KLK7, PRSS8, and SLC6A14. In addition, GGPS1, a member of the prenyltransferase family, which encodes an enzyme that catalyzes the synthesis of geranylgeranyl diphosphate from farnesyl diphosphate and isopentenyl diphosphate, was associated with osteogenesis imperfecta. This evidence concerns the gene KLK7 and osteogenesis imperfecta.