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- W74156210 abstract "Patients with Sandhoff disease have less than 5% of normal levels of serum or tissue hexosaminidase activity. They are thought to have a defect in the structural gene for the beta chain of hexosaminidase (HEX). Heterozygotes for Sandhoff disease have approximately 50% of the total serum HEX activity of normals and more than 75% of the HEX is heat-labile. In normals, only 55%--65% of serum HEX is heat-labile. Serum HEX separates into three forms on DEAE cellulose chromatography: HEX A, a tetramer of 2 alpha and 2 beta chains, and HEX I and B composed solely of beta chains. The DEAE chromatograms from normals and Sandhoff heterozygotes did not differ in the relative distribution of HEX activity between peaks. In normals, the HEX A peak was heat-labile (60 degrees C for 9 min), but HEX I and B were heat-stable. In Sandhoff heterozygotes, however, HEX I and B were only 50%--53% heat-stable. This suggests the heterozygotes synthesized a hybrid enzyme containing both mutant and wild-type beta chains for HEX. The mutant beta chain renders the isoenzyme less stable to heating." @default.
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- W74156210 date "1979-05-01" @default.
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- W74156210 title "Evidence for a hybrid hexosaminidase isoenzyme in heterozygotes for Sandhoff disease." @default.
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