Tay Sachs Disease
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Tay Sachs Disease 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.
- Amaurotic Familial Idiocy
- Amaurotic Familial Infantile Idiocy
- Cerebromacular Degeneration
- GM2 Gangliosidosis, Type 1
- Hexoaminidase Alpha-Subunit Deficiency (Variant B)
- Infantile Cerebral Ganglioside
- Infantile Sipoidosis GM-2 Gangliosideosis (Type S)
- Lipidosis, ganglioside, infantile
- Sphingolipidosis, Tay-Sachs
Tay-Sachs disease is a rare, neurodegenerative disorder in which deficiency of an enzyme (hexosaminidase A) results in excessive accumulation of certain fats (lipids) known as gangliosides in the brain and nerve cells. This abnormal accumulation of gangliosides leads to progressive dysfunction of the central nervous system. This disorder is categorized as a lysosomal storage disease. Lysosomes are the major digestive units in cells. Enzymes within lysosomes break down or "digest" nutrients, including certain complex carbohydrates and fats.
Symptoms associated with Tay-Sachs disease may include an exaggerated startle response to sudden noises, listlessness, loss of previously acquired skills (i.e., psychomotor regression), and severely diminished muscle tone (hypotonia). With disease progression, affected infants and children may develop cherry-red spots within the middle layer of the eyes, gradual loss of vision, and deafness, increasing muscle stiffness and restricted movements (spasticity), eventual paralysis, uncontrolled electrical disturbances in the brain (seizures), and deterioration of cognitive processes (dementia). The classical form of Tay-Sachs disease occurs during infancy; an adult form (late-onset Tay-Sachs disease) may occur anytime from adolescence to the mid 30's.
Tay-Sachs disease is inherited as an autosomal recessive trait. The disorder results from changes (mutations) of a gene known as the HEXA gene, which regulates production of the hexosaminidase A enzyme. The HEXA gene has been mapped to the long arm (q) of chromosome 15 (15q23-q24).
CLIMB (Children Living with Inherited Metabolic Diseases)
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Canadian Society for Mucopolysaccharide and Related Diseases, Inc.
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- Website: http://www.mpssociety.ca
Genetic and Rare Diseases (GARD) Information Center
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- Website: http://rarediseases.info.nih.gov/GARD/
Hide & Seek Foundation for Lysosomal Disease Research
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- Long Beach, CA 90803
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Instituto de Errores Innatos del Metabolismo
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- Website: http://www.javeriana.edu.co/ieim/programas_ieim.htm
Let Them Hear Foundation
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March of Dimes Birth Defects Foundation
- 1275 Mamaroneck Avenue
- White Plains, NY 10605
- Tel: (914)997-4488
- Fax: (914)997-4763
- Website: http://www.marchofdimes.com
NIH/National Institute of Child Health and Human Development
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- Email: NICHDInformationResourceCenter@mail.nih.gov
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NIH/National Institute of Neurological Disorders and Stroke
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- Tel: (301)496-5751
- Fax: (301)402-2186
- Tel: (800)352-9424
- Website: http://www.ninds.nih.gov/
National Tay-Sachs and Allied Diseases Association, Inc.
- 2001 Beacon Street
- Brookline, MA 02146-4227
- Tel: (617)277-4463
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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 email@example.com
Last Updated: 1/1/1970
Copyright 2002 National Organization for Rare Disorders, Inc.
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