Analysis of clinical features and GALNS gene mutation in a patient with mucopolysaccharidosis type IV A

Objective To detect potential mutation of galactosamine-6-sulfate (GALNS) gene in a Chinese girl affected with mucopolysaccharidosis type ⅣA (Morquio A syndrome). Methods The patient was diagnosed by assaying the activities of mucopolysaccharidosis-related enzymes in leukocytes. Potential mutation in the GALNS gene was detected with PCR and Sanger sequencing. Results The patient was characterized by short stature, skeletal deformities, normal intelligence, and auditory dysfunction. The activities of GALNS enzymes were low. A compound heterozygous missense mutation, c. 1094G>T (p.Gly365Val)/c.938C>T (p.Thr313Met), was detected in the GALNS gene. The mutations were respectively inherited from her father and mother. Among them, the c. 1094G>T (p.Gly365Val) mutation was not reported previously. Conclusion The mutations c. 1094G>T (p.Gly365Val)/c.938C>T (p.Thr313Met) probably underlie the pathogenesis of the disease in our patient. Key words: Mucopolysaccharidosis type ⅣA; Galactosamine-6-sulfate; Gene mutation