Tay-Sachs is a rare disease that is passed down through some families. A person with Tay-Sachs has changed (mutated) genes that don't make any or enough of an enzyme called hexosaminidase A (hex A). Hex A breaks down fatty compounds. Without it, fatty compounds build up in the nerve cells of the brain and cause damage.
There are two forms of Tay-Sachs:
Tay-Sachs can occur when parents pass on a changed gene to their child.
In late-onset Tay-Sachs (LOTS), the body makes a small amount of hex A. People with LOTS inherit the late-onset hex A gene change from one or both parents.
The changed gene that causes Tay-Sachs disease is more commonly found in people of Ashkenazi Jewish descent. About 1 out of 30 people in this population is a carrier of the disease.footnote 2 People of French-Canadian descent from the East Saint Lawrence River Valley of Quebec and people of Cajun descent in Louisiana are also more likely than others to carry the changed gene.
A child with Tay-Sachs disease looks healthy at birth. But when the child is:
Children with Tay-Sachs rarely live beyond 4 years of age.
In late-onset Tay-Sachs (LOTS), early symptoms such as clumsiness or mood changes may be minor or seem "normal" and go unnoticed. Later symptoms may include muscle weakness and twitching, slurred speech, and trouble thinking and reasoning. The symptoms depend on how much hex A the body makes.
If you or your doctor thinks that your child has Tay-Sachs disease, your doctor will do a physical examination and a blood test to check the level of hex A. A genetic test may be needed to be sure the disease is Tay-Sachs.
The focus of treatment for Tay-Sachs disease is to control symptoms and make your child as comfortable as possible. There is no cure. It may be helpful to seek counselling or find support from others who are going through the same thing you are.
If you have late-onset Tay-Sachs disease (LOTS), treatment also focuses on controlling symptoms. The treatment you receive, such as medicine for depression, depends on the symptoms you have.
It may be overwhelming to learn that your child has Tay-Sachs. It's important that you care for yourself as well as your child. Talk to your doctor about:
As the disease gets worse, your child will need more care. Encourage your child to be as active as possible for as long as possible. Give your child your love and affection.
You may not be able to care for your child without help. Talk with your doctor about groups that can help you.
If you are thinking about having a child, experts recommend that:footnote 3, footnote 1
Carriers of the Tay-Sachs gene changes can pass the changed gene to their children even though the carriers don't have the disease. If both you and your partner are carriers, there is a 1-out-of-4 chance (25%) that any child you have will have Tay-Sachs disease.
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Learning about Tay-Sachs disease:
Genetics Committee, Society of Obstetricians and Gynaecologists of Canada (2006). Carrier screening for genetic disorders in individuals of Ashkenazi Jewish descent. Journal of Obstetrics and Gynaecology Canada, 177: 324-332. Also available online: http://www.sogc.org/guidelines/public/177E-CPG-April2006.pdf.
Committee on Genetics, American College of Obstetricians and Gynecologists (2009). Preconception and prenatal carrier screening for genetic diseases in individuals of Eastern European Jewish descent. Obstetrics and Gynecology, 114(4): 950-953.
Committee on Genetics, American College of Obstetricians and Gynecologists (2005, reaffirmed 2010). Screening for Tay-Sachs disease. Obstetrics and Gynecology, 106(4): 893-894.
Other Works Consulted
Haslam RHA (2006). Degenerative diseases of the central nervous system. In FD Burg et al., eds., Current Pediatric Therapy, 18th ed., pp. 388-392. Philadelphia: Saunders Elsevier.
Neudorfer O, Kolodny EH (2004). Late-onset Tay-Sachs disease. Israel Medical Association Journal, 6: 107-111.
Ropper AH, et al. (2014). Inherited metabolic diseases of the nervous system. In Adams and Victor's Principles of Neurology, 10th ed., pp. 946-1002. York: McGraw-Hill Education.
ByHealthwise StaffPrimary Medical ReviewerSarah Marshall, MD - Family MedicineThomas M. Bailey, MD - Family MedicineE. Gregory Thompson, MD - Internal MedicineAdam Husney, MD - Family MedicineMartin J. Gabica, MD - Family MedicineSpecialist Medical ReviewerSiobhan M. Dolan, MD, MPH - Reproductive Genetics
Current as ofOctober 13, 2016
Current as of: October 13, 2016
Sarah Marshall, MD - Family Medicine
& Thomas M. Bailey, MD - Family Medicine & E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine & Siobhan M. Dolan, MD, MPH - Reproductive Genetics
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