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Alpha-Mannosidosis

National Organization for Rare Disorders, Inc.

Important
It is possible that the main title of the report Alpha-Mannosidosis is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Synonyms

  • alpha-mannosidase B deficiency
  • lysosomal alpha-D-mannosidase deficiency
  • mannosidase, alpha B, lysosomal
  • mannosidosis
  • mannosidosis, alpha B, lysosomal

Disorder Subdivisions

  • alpha-mannosidosis, type I
  • alpha-mannosidosis, type II
  • alpha-mannosidosis, type III

General Discussion

Summary
Alpha-mannosidosis is a rare genetic disorder characterized by a deficiency of the enzyme alpha-D-mannosidase. Alpha-mannosidosis is best thought of as a continuum of disease that is generally broken down into three forms: a mild, slowly progressive form (type 1); a moderate form (type 2); and a severe, often rapidly progressive and potentially life-threatening form (type 3). The symptoms and severity of the disorder are highly variable. Symptoms may include distinctive facial features, skeletal abnormalities, hearing loss, intellectual disability, and dysfunction of the immune system. Alpha-mannosidosis is caused by mutations of the MAN2B1 gene. This genetic mutation is inherited as an autosomal recessive trait.

Introduction
Alpha-mannosidosis belongs to a group of diseases known as the lysosomal storage disorders. Lysosomes are particles bound in membranes within cells that function as the primary digestive units. Enzymes within the lysosomes break down or digest particular nutrients, such as complex molecules composed of a sugar attached to a protein (glycoproteins). Low levels or inactivity of the alpha-mannosidase enzyme leads to the abnormal accumulation of compounds upstream in the metabolic pathway in the cells of affected individuals with unwanted consequences.

Resources

CLIMB (Children Living with Inherited Metabolic Diseases)
Climb Building
176 Nantwich Road
Crewe, CW2 6BG
United Kingdom
Tel: 4408452412173
Fax: 4408452412174
Email: enquiries@climb.org.uk
Internet: http://www.CLIMB.org.uk

Vaincre Les Maladies Lysosomales
2 Ter Avenue
Massy, 91300
France
Tel: 0169754030
Fax: 0160111583
Email: accueil@vml-asso.org
Internet: http://www.vml-asso.org

National Tay-Sachs and Allied Diseases Association, Inc.
2001 Beacon Street
204
Brookline, MA 02146-4227
USA
Tel: (617)277-4463
Fax: (617)277-0134
Tel: (800)906-8723
Email: info@ntsad.org
Internet: http://www.NTSAD.org

March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: (914)997-4488
Fax: (914)997-4763
Tel: (888)663-4637
Email: Askus@marchofdimes.com
Internet: http://www.marchofdimes.com

The Arc
1825 K Street NW, Suite 1200
Washington, DC 20006
Tel: (202)534-3700
Fax: (202)534-3731
Tel: (800)433-5255
TDD: (817)277-0553
Email: info@thearc.org
Internet: http://www.thearc.org

National MPS Society, Inc.
PO Box 14686
Durham, NC 27709
Tel: (919)806-0101
Fax: (919)806-2055
Tel: (877)677-1001
Email: info@mpssociety.org
Internet: http://www.mpssociety.org

NIH/National Institute of Diabetes, Digestive & Kidney Diseases
Office of Communications & Public Liaison
Bldg 31, Rm 9A06
31 Center Drive, MSC 2560
Bethesda, MD 20892-2560
Tel: (301)496-3583
Email: NDDIC@info.niddk.nih.gov
Internet: http://www2.niddk.nih.gov/

Society for Mucopolysaccharide Diseases
MPS House
Repton Place
White Lion Road
Amersham
Buckinghamshire, HP7 9LP
United Kingdom
Tel: 08453899901
Fax: 08453899902
Email: mps@mpssociety.co.uk
Internet: http://www.mpssociety.co.uk

Canadian Society for Mucopolysaccharide and Related Diseases, Inc.
PO Box 30034
RPO Parkgate
North Vancouver
British Columbia, V7H 2Y8
Canada
Tel: 6049245130
Fax: 6049245131
Tel: 8006671846
Email: info@mpssociety.ca
Internet: http://www.mpssociety.ca

International Advocate For Glycoprotein Storage Diseases
3921 Country Club Drive
Lakewood, CA 90712
USA
Tel: (410)628-9991
Email: info@ismrd.org
Internet: http://www.ismrd.org

GOLD, Global Organisation For Lysosomal Diseases
3 Albion Rd
Chalfont St Giles
Buckinghamshire, HP8 4EW
United Kingdom
Tel: 441494870708
Email: enquiries@goldinfo.org
Internet: http://www.goldinfo.org

Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
TDD: (888)205-3223
Internet: http://rarediseases.info.nih.gov/GARD/

Madisons Foundation
PO Box 241956
Los Angeles, CA 90024
Tel: (310)264-0826
Fax: (310)264-4766
Email: getinfo@madisonsfoundation.org
Internet: http://www.madisonsfoundation.org

Hide & Seek Foundation for Lysosomal Disease Research
6475 East Pacific Coast Highway Suite 466
Long Beach, CA 90803
Tel: (877)621-1122
Fax: (866)215-8850
Email: info@hideandseek.org
Internet: http://www.hideandseek.org

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

For additional information and assistance about rare disorders, please contact the National Organization for Rare Disorders at P.O. Box 1968, Danbury, CT 06813-1968; phone (203) 744-0100; web site www.rarediseases.org or email orphan@rarediseases.org

Last Updated:  10/1/2012
Copyright  1987, 1988, 1990, 2004, 2006, 2009, 2012 National Organization for Rare Disorders, Inc.

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