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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 example of a disease caused by frameshift mutation. The disease is caused by various mutations, including frameshift mutations, on chromosome 15 in the HEXA gene that codes for the alpha-subunit of the lysosomal enzyme beta-N-acetylhexosaminidase A. Variant(s): frame shift mutation; Also called: framing error; reading frame shift