what is tay sachs
Tay-Sachs disease (the most severe form of Hexosaminidase A deficiency) is a progressive, fatal genetic condition that affects the nerve cells in the brain.ll people have two copies of the Tay-Sachs gene (HEXA). Tay-Sachs occurs when neither of a person's HEXA genes is working properly because of a mutation (harmful change). If a person has one working copy of the HEXA gene and the other copy has a mutation in it, he/she is called a carrier..