Mucopolysaccharidosis IVA (MPS IVA) or Morquio A syndrome (ORPHA: 309297, OMIM: 253000) is a rare, autosomal recessive lysosomal storage disorder (LSD) caused by mutations in the GALNS gene, resulting in the deficiency of N-acetyl-galactosamine-6-sulfate sulfatase (GALNS) enzyme [1,2,3,4,5]. This evidence concerns the gene GALNS and mucopolysaccharidosis type 4A.