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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 1 People of French-Canadian descent or Cajun descent are also more likely 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 1, footnote 2
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.
Citations American College of Obstetricians and Gynecologists (2017). Carrier screening for genetic conditions. Committee Opinion No. 691. Obstetrics and Gynecology, 129(3): e41-55. DOI: 10.1097/AOG.0000000000001952. Accessed April 18, 2017.Genetic Evaluation of Congenital Hearing Loss Expert Panel (2002; reaffirmed 2005). Genetics evaluation guidelines for the etiologic diagnosis of congenital hearing loss. Genetics in Medicine, 4(3): 162–171.
Current as of: December 9, 2019
Author: Healthwise StaffMedical Review: Sarah Marshall MD - Family MedicineThomas M. Bailey MD - Family MedicineE. Gregory Thompson MD - Internal MedicineAdam Husney MD - Family MedicineMartin J. Gabica MD - Family MedicineSiobhan M. Dolan MD, MPH - Reproductive Genetics
Current as of: December 9, 2019
Author: Healthwise Staff
Medical Review: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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