In DOLK‐CDG, DPM1‐CDG, DPM2‐CDG, and DPM3‐CDG, biochemical and phenotypic abnormalities overlap with CDG‐I and muscular dystrophy‐dystroglycanopathy, which is caused by reduced O‐mannosylation of alpha‐dystroglycan (αDG).2, 3, 4, 5. Here, DPM3 is linked to muscular dystrophy.