IFITM5 and osteogenesis imperfecta: In light of present knowledge, only three IFITM5 pathogenic variants have been identified that are associated with OI: a recurrent C‐T transition (c.‐14C > T) in the 5′‐UTR and two missense variants in codon 40 (serine) in exon 1 (Farber et al., 2014; Hanagata, 2016; Lim et al., 2019).