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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

20880 Canyon View Drive

Saratoga, CA 95070

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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