Abstract
A deficiency in α-galactosidase (α-Gal) activity–as measured aspecifically with the use of artificial substrates–is a regular feature in leucocytes and fibroblasts of patients affected by angiokeratoma corporis diffusum or Fabry's disease, a well-known X-linked trait in man1–4. Fibroblast clones derived from mothers of affected males exhibit either normal or deficient activity of α-galactosidase. This demonstrates that the deficiency of α-galactosidase is caused by an X-linked mutation, but does not necessarily prove that the structural locus for this enzyme is itself located on the X-chromosome.
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