Diseases & Conditions


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Morquio Syndrome


Synonyms of Morquio Syndrome
  • Morquio Disease
  • MPS IV
  • Mucopolysaccharidosis IV

Disorder Subdivisions

  • Morquio Syndrome A
  • Morquio Syndrome B


General Discussion
Morquio syndrome (mucopolysaccharidosis type IV; MPS IV) is a mucopolysaccharide storage disease that exists in two forms (Morquio syndromes A and B) and occurs because of a deficiency of the enzymes N-acetyl-galactosamine-6-sulfatase and beta-galactosidase, respectively. A deficiency of either enzyme leads to the accumulation of mucopolysaccharides in the body, abnormal skeletal development, and additional symptoms. In most cases, individuals with Morquio syndrome have normal intelligence. The clinical features of MPS IV-B are usually fewer and milder than those associated with MPS IV-A. Symptoms may include growth retardation, a prominent lower face, an abnormally short neck, knees that are abnormally close together (knock knees or genu valgum), flat feet, abnormal sideways and front-to-back or side-to-side curvature of the spine (kyphoscoliosis), abnormal development of the growing ends of the long bones (epiphyses), and/or a prominent breast bone (pectus carinatum). Hearing loss, weakness of the legs, and/or additional abnormalities may also occur.

The mucopolysaccharidoses (MPS) are a group of inherited lysosomal storage disorders. Lysosomes function as the primary digestive units within cells. Enzymes within lysosomes break down or digest particular nutrients, such as certain carbohydrates and fats. In individuals with MPS disorders, deficiency or malfunction of specific lysosomal enzymes leads to an abnormal accumulation of certain complex carbohydrates (mucopolysaccharides or glycosaminoglycans) in the arteries, skeleton, eyes, joints, ears, skin, and/or teeth. These accumulations may also be found in the respiratory system, liver, spleen, central nervous system, blood, and bone marrow. This accumulation eventually causes progressive damage to cells, tissues, and various organ systems of the body. There are several different types and subtypes of mucopolysaccharidosis. These disorders, with one exception, are inherited as autosomal recessive traits.

Organizations related to Morquio Syndrome
  • CLIMB (Children Living with Inherited Metabolic Diseases)
    Climb Building
    Crewe Intl CW2 6BG
    Phone #: +44- 87-0 7700 325
    800 #: --
    e-mail: info@climb.org.uk
    Home page: http://www.CLIMB.org.uk
  • Canadian Society for Mucopolysaccharide and Related Diseases, Inc.
    PO Box 64714
    Ontario Intl L3R OM9
    Phone #: 905--47-9-8701
    800 #: 800--66-7-1846
    e-mail: lori.mps@rogers.com
    Home page: http://www.mpssociety.ca
  • Hide & Seek Foundation for Lysosomal Disease Research
    4123 Lankershim Blvd.
    North Hollywood CA 91602-2828
    Phone #: 818-762-8621
    800 #: N/A
    e-mail: info@hideandseek.org
    Home page: http://www.hideandseek.org
  • Instituto de Errores Innatos del Metabolismo
    Carrera 7 No 43-82
    S.A. Edificio 53 Lab. 305A None None
    Phone #: 50 -1 3-208320
    800 #: N/A
    e-mail: abarrera@javeriana.edu.co
    Home page: http://www.javeriana.edu.co
  • MUMS (Mothers United for Moral Support, Inc) National Parent-to-Parent Network
    150 Custer Court
    Green Bay WI 54301-1243
    Phone #: 920-336-5333
    800 #: 877-336-5333
    e-mail: mums@netnet.net
    Home page: http://www.netnet.net/mums/
  • Madisons Foundation
    PO Box 241956
    Los Angeles CA 90024
    Phone #: 310-264-0826
    800 #: N/A
    e-mail: getinfo@madisonsfoundation.org
    Home page: http://www.madisonsfoundation.org
  • NIH/National Digestive Diseases Information Clearinghouse
    2 Information Way
    Bethesda MD 20892-3570
    Phone #: 301-654-3810
    800 #: 800-891-5389
    e-mail: nddic@info.niddk.nih.gov
    Home page: http://www.niddk.nih.gov
  • National MPS (Mucopolysaccharidoses/Mucolipidoses) Society, Inc.
    PO Box 14686
    Durham NC 27709-4686
    Phone #: 919-806-0101
    800 #: --
    e-mail: info@mpssociety.org
    Home page: http://www.mpssociety.org
  • Society for Mucopolysaccharide Diseases
    46 Woodside Road
    Buckinghamshire None HP6 6AJ
    Phone #: 004-401-494 434156
    800 #: --
    e-mail: mps@mpssociety.co.uk
    Home page: http://www.mpssociety.co.uk
  • Vaincre Les Maladies Lysosomales
    2 ter avenue de Fance
    Massy None 91300
    Phone #: 01 -69 -75 40 30
    800 #: --
    e-mail: accueil@vml-asso.org
    Home page: http://www.vml-asso.org



For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html