GNE and Distal myopathy, Nonaka type: GNE myopathy (GNE-M), which was formerly known as Nonaka myopathy (NM), is an ultra-rare autosomal recessive distal myopathy caused by a biallelic variant in UDP-N-acetylglucosamine 2-epomerase/N-acetylmannosamine kinase (GNE) [1].