KDELR2 and osteogenesis imperfecta: In the past year, studies have successively reported three new causative genes for OI (MESD, KDELR2, and CCDC134) (Dubail et al., 2020; van Dijk et al., 2020; Stürznickel and Jähn-Rickert, 2021), which were not included in the panel.