Tay-Sachs has three distinct categories: infantile, juvenile (subacute), and late-onset. The classificiation refers to the age of the individual when the production of lysosomes started being adversely affected by the mutant HEXA gene. Infantile Tay-Sachs is the most common form of the disease. Symptoms present at three to six months. Until then, children will usually appear healthy. However, because the body has never had effective production of lysosomes to properly clean the cells, this form is the most severe.

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