Diseases categorized as lysosomal storage disorders stem
from defects in one or more of the digestive enzymes
present in lysosomes, usually due to a mutation leading
to a deficiency of one of the enzymes, or defects due to
faulty posttranslational processing. In cells that must
digest the substrate of the missing or defective enzyme
following autophagocytosis, the lysosomes cannot function
properly. Such cells accumulate large secondary
lysosomes or residual bodies filled with the indigestible
macromolecule. The accumulation of these vacuoles may
eventually interfere with normal cell or tissue function,
producing symptoms of the disease. A few lysosomal
storage diseases are listed in Table 2–3, with the enzyme
involved for each and the tissue affected