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Tay-Sachs disease An inherited condition characterized by the absence of a single lysosomal enzyme called Hex A, which normally breaks down a membrane glycolipid called ganglioside G_M2 that is especially prevalent in nerve cells; usually occurs in children of Ashkenazi (eastern European Jewish) descent and is characterized by seizures and muscle rigidity.
Tay-Sachs disease is an inherited disease caused by an abnormal gene. People with this abnormal gene do not have an important enzyme called hexosaminidase A (HEXA) that helps to break down a fatty material called ganglioside GM2. This material builds up in the brain, and eventually damages nerve cells and causes neurological problems.