Characterization of unusual hexosaminidase A (HEX A) deficient human mutants.


Two families with unusual hexosaminidase A (HEX A) mutations are described. In one, the proband had the Tay-Sachs disease phenotype with considerable HEX A activity. In the second, the proband was phenotypically normal with absent HEX A activity. Activities using ganglioside GM2 as substrate demonstrate markedly reduced activities in the first case and half… (More)


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