SPP1 and Duchenne muscular dystrophy: These regions do not contain genes for which variants are known to affect disease progression in DMD, such as osteopontin [secreted phosphoprotein 1 (SPP1)], latent TGFB protein 4 (LTBP4) (reviewed by Quattrocelli et al., 2017b) and Tctex1 domain containing 1 (TCTEX1D1, alias DYNLT5) (Spitali et al., 2020), in humans or JAGGED1 in dogs (Vieira et al., 2015).