Ornithine Transcarbamylase Deficiency

National Organization for Rare Disorders, Inc.

Important
It is possible that the main title of the report Ornithine Transcarbamylase Deficiency 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

  • Hyperammonemia Type II
  • Ornithine Carbamyl Transferase Deficiency
  • OTC Deficiency
  • Hyperammonemia due to Ornithine Transcarbamylase Deficiency

Disorder Subdivisions

  • None

General Discussion

Ornithine transcarbamylase (OTC) deficiency is a rare genetic disorder characterized by complete or partial lack of the enzyme ornithine transcarbamylase (OTC). OTC is one of six enzymes that play a role in the break down and removal of nitrogen the body, a process known as the urea cycle. The lack of the OTC enzyme results in excessive accumulation of nitrogen, in the form of ammonia (hyperammonemia), in the blood. Excess ammonia, which is a neurotoxin, travels to the central nervous system through the blood, resulting in the symptoms and physical findings associated with OTC deficiency. Symptoms include vomiting, refusal to eat, progressive lethargy, and coma. OTC deficiency is inherited as an X-linked recessive trait.

The urea cycle disorders are a group of rare disorders affecting the urea cycle, a series of biochemical processes in which nitrogen is converted into urea and removed from the body through the urine. Nitrogen is a waste product of protein metabolism. Failure to break down nitrogen results in the abnormal accumulation of nitrogen, in the form of ammonia, in the blood.

Resources

CLIMB (Children Living with Inherited Metabolic Diseases)
Climb Building
176 Nantwich Road
Crewe, Intl CW2 6BG
United Kingdom
Tel: +44 870 7700 325
Fax: +44 870 7700 327
Email: info.svcs@climb.org.uk
Internet: http://www.CLIMB.org.uk

National Urea Cycle Disorders Foundation
75 South Grand Avenue
Pasadena, CA 91105-1602
Tel: (626)578-0833
Tel: (800)386-8233
Email: info@nucdf.org
Internet: http://www.nucdf.org

National Kidney Foundation
30 East 33rd Street
New York, NY 10016
Tel: (212)889-2210
Fax: (212)689-9261
Tel: (800)622-9010
Email: info@kidney.org
Internet: http://www.kidney.org

Organic Acidaemias UK
5 Saxon Road
Ashford
Middlesex, Intl TW15 1QL
United Kingdom
Tel: 44-1784-245989
Email: davidpriddy@bigfoot.com

NIH/National Digestive Diseases Information Clearinghouse
2 Information Way
Bethesda, MD 20892-3570
Tel: (301)654-3810
Fax: (301)907-8906
Tel: (800)891-5389
Email: nddic@info.niddk.nih.gov
Internet: http://www.niddk.nih.gov

MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay, WI 54301-1243
USA
Tel: (920)336-5333
Fax: (920)339-0995
Tel: (877)336-5333
Email: mums@netnet.net
Internet: http://www.netnet.net/mums/

Belgian Association for Metabolic Diseases (BOKS)
Alice Nahonlann 7
Melsele, 9120
Belgium
Tel: 3237754839
Email: info@boks.be
Internet: http://www.boks.be

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
Email: ordr@od.nih.gov
Internet: http://rarediseases.info.nih.gov/Default.aspx

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

Urea Cycle Disorders Consortium
Children’s Research Institute
Children’s National Medical Center
111 Michigan Avenue, NW
Washington, DC 20010
Email: jseminar@cnmc.org
Internet: http://rarediseasesnetwork.epi.usf.edu/ucdc/index.htm

For a Complete Report

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

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