Congenital Disorders of Glycosylation
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Congenital Disorders of Glycosylation 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 Back to top
- CDG syndrome
- carbohydrate-deficient glycoprotein syndromes
Disorder Subdivisions Back to top
General Discussion Back to top
Congenital disorders of glycosylation (CDG) is an umbrella term for an expanding group of rare metabolic disorders that share similar but not identical genetic changes (mutations) and biochemical activity. These disorders involve a normal, but complex, chemical process known as glycosylation. Glycosylation is the process by which sugar chains (glycans) are created, altered and chemically attached to certain proteins or fats (lipids). When these sugar molecules are attached to proteins, they form glycoproteins; when they are attached to lipids, they form glycolipids. Glycoproteins and glycolipids have varied important functions within the body and are essential for the normal growth and function of numerous tissues and organs. Glycosylation involves many different genes, which encode many different proteins such as enzymes. A deficiency or lack of one of these enzymes can lead to a variety of symptoms potentially affecting multiple organ systems. CDG can affect virtually any part of the body, although most cases usually have an important neurological component. CDG can be associated with a broad variety of symptoms and can vary in severity from mild cases to severe, disabling or life-threatening cases. CDG are usually apparent in infancy. Individual CDG are caused by a mutation to a specific gene. Most CDG are inherited as autosomal recessive conditions.
CDG were first reported in the medical literature in 1980 by Dr. Jaak Jaeken, et al. More than 50 different forms of CDG have been identified in the ensuing years. Several different names have been used to describe these disorders including carbohydrate-deficient glycoprotein syndromes. Recently, researchers have proposed a classification system that names each subtype by the official abbreviation of its defective gene followed by a dash and CDG. For example, congenital disorder of glycosylation type 1a is now known as PMM2-CDG. PMM2 is the defective gene that causes this subtype of CDG. CDG are a rapidly growing disease family and information about these disorders is constantly changing.
Resources Back to top
Children Living with Inherited Metabolic Diseases (CLIMB)
176 Nantwich Road
Crewe, Intl CW2 6BG
Tel: 0845 241 2174
Tel: 800 652 3181
1660 L Street, NW, Suite 301
Washington, DC 20036
CDG Family Network
PO Box 860847
Plano, TX 75074
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
For a Complete Report Back to top
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 firstname.lastname@example.org
Last Updated: 1/9/2012
Copyright 2012 National Organization for Rare Disorders, Inc.
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