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. This evidence concerns the gene DAG1 and muscular dystrophy.