title: Mucolipidosis type III in an adolescent presenting with atypical facial features and skeletal deformities.
abstract: Mucolipidosis type III (MLIII) (MIM# 252600) is an uncommon autosomal recessive disorder that results from deficiency of the multimeric enzyme, UDP-N-acetylglucosamine-1-phosphotransferase. The enzymatic defect results in deficiencies of lysosomal degradative enzymes with concomitant intracellular accumulation of both partly degraded glycosaminoglycans and sphingolipids leading to clinical manifestations such as short stature, developmental delay and other structural abnormalities. The diagnosis is challenging since musculoskeletal presentation may mimic some of the rheumatic and metabolic disorders. We herein report on a 13-year-old adolescent who was admitted to our rheumatology clinic because of progressive joint stiffness and deformities of her hands. The clinical and radiological findings led us to the diagnosis of MLIII despite negative urinary aminoglycosyaminoglycans. Therefore we decided to check for the presence of elevated activities of alpha-mannosidase and beta-hexosaminidase A+B in the plasma which was actually the case and confirmed the clinical diagnosis ofMLIII.
authors.affiliation: Pediatric Genetics Unit, Ihsan Dogramaci Children's Hospital, Hacettepe University, Ankara, Turkey. pelinozlem@hacettepe.edu.tr
authors.forename: P O
authors.initials: PO
authors.lastname: Simsek-Kiper
authors.forename: R
authors.initials: R
authors.lastname: Topaloglu
authors.forename: Y
authors.initials: Y
authors.lastname: Sahin
authors.forename: G E
authors.initials: GE
authors.lastname: Utine
authors.forename: K
authors.initials: K
authors.lastname: Boduroglu
mesh_terms: D000015:Abnormalities, Multiple / Q000097:blood / Q000175:diagnosis* / Q000000981:diagnostic imaging; D000293:Adolescent; D015415:Biomarkers / Q000097:blood; D003937:Diagnosis, Differential; D004413:Dysostoses / Q000150:complications / Q000000981:diagnostic imaging; D005121:Extremities / Q000000981:diagnostic imaging; D019066:Facies; D005260:Female; D006225:Hand / Q000000981:diagnostic imaging; D006227:Hand Deformities, Acquired / Q000150:complications / Q000000981:diagnostic imaging; D006801:Humans; D007592:Joint Diseases / Q000150:complications / Q000000981:diagnostic imaging; D009081:Mucolipidoses / Q000097:blood / Q000150:complications / Q000175:diagnosis*; D011859:Radiography; D016059:Range of Motion, Articular; D043323:alpha-Mannosidase / Q000097:blood; D001619:beta-N-Acetylhexosaminidases / Q000097:blood
chemical_list: D015415:Biomarkers; D043323:alpha-Mannosidase; D001619:beta-N-Acetylhexosaminidases