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Tay-Sachs disease heterozygote detection: use of a centrifugal analyser for automation of hexosaminidase assays with two different artificial substrates.

Abstract
An assay for measuring hexosaminidase A in serum and leucocytes is described in which a centrifugal analyser is used for automation of the enzyme assays after manual heat inactivation. The assay was used in a screening programme to identify heterozygotes for Tay-Sachs disease in Ashkenazi Jewish subjects in the UK. The first results from this programme indicate a carrier frequency of 1 in 27. Automation of an assay for direct measurement of hexosaminidase A in serum using 4-methyl-umbelliferyl-beta-N-acetylglucosamine-6-sulphate as substrate is also described. Comparison of data obtained from 66 control and 30 obligate carrier sera tested by this method and by heat inactivation showed improved discrimination using the sulphated substrate. Results obtained using the sulphated substrate for screening serum during pregnancy are also presented.
AuthorsE C Landels, I H Ellis, M Bobrow, A H Fensom
JournalJournal of medical genetics (J Med Genet) Vol. 28 Issue 2 Pg. 101-9 (Feb 1991) ISSN: 0022-2593 [Print] England
PMID1825851 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • 4-methylumbelliferyl 2-acetamido-2-deoxy-beta-D-glucopyranoside
  • Hymecromone
  • 4-methylumbelliferyl-6-sulfo-2-acetamido-2-deoxy-beta-glucopyranoside
  • Hexosaminidase A
  • beta-N-Acetylhexosaminidases
  • Glucosamine
  • Acetylglucosamine
Topics
  • Acetylglucosamine (analogs & derivatives)
  • Automation
  • Cell Separation
  • Centrifugation
  • Female
  • Flow Cytometry
  • Genetic Carrier Screening (methods)
  • Genetic Testing
  • Glucosamine (analogs & derivatives)
  • Hexosaminidase A
  • Hot Temperature
  • Humans
  • Hymecromone (analogs & derivatives)
  • Leukocytes (enzymology)
  • Pregnancy
  • Prenatal Diagnosis
  • Tay-Sachs Disease (diagnosis, enzymology, genetics)
  • beta-N-Acetylhexosaminidases (analysis, blood)

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