X-linked CNM (XLCNM, also called myotubular myopathy) is caused by mutations in the phosphoinositide phosphatase myotubularin (MTM1; MIM#310400) and autosomal dominant and recessive CNM due to mutations in the DNM2 partner amphiphysin 2 (BIN1; MIM#255200). The gene discussed is DNM2; the disease is X-linked myotubular myopathy.