COL1A1 and osteogenesis imperfecta: However, only two forms of canine OI have been elucidated on a molecular level so far (OMIA 002112-9615, 001483-9615) (Campbell et al. 2000; 2001; Drogemuller et al. 2009; Schutz et al. 2013; Lenffer et al., 2006)) and only recently COL1A1 de novo mutations have been described in Fleckvieh and Red Angus (OMIA 002127-9913) (Bourneuf et al. 2017; Lenffer et al., 2006; Petersen et al. 2019).