Abstract:
:Triosephosphate isomerase deficiencies in erythrocytes and leucocytes were discovered in three unrelated families by a heterozygote screening of 3000 blood samples. In addition, a family found by Schroter et al. [not published] was studied. In these four families, only heterozygote carriers were found. In the family described by Freycon et al. with hetero- and homozygote carriers of triosephosphate isomerase deficiency, the heterozygotes were reinvestigated. There was 51% of normal enzyme activity in three of the families. In the other two families the enzyme activity was 64% and 71% of normal. Two of the eleven heterozygotes, both children, were diseased, but it seems unlikely that the disorders resulted from the deficiencies. The activities of thirteen enzymes, the Km of triosephosphate isomerase for glyceraldehyde phosphate and the concentrations of metabolites were normal. Antibody titration showed normal specific activities in four families and 50% of normal in one family. No electrophoretic variant was detected. From the proved heredity, a heterozygous frequency of at least 1/1000 is indicated. A maximal frequency of 5/1000 is estimated by using further instances of triosephosphate isomerase deficiency where heredity has not yet been investigated. An explanation for the small number of known cases is that this enzyme is not routinely assayed.
journal_name
Eur J Clin Investjournal_title
European journal of clinical investigationauthors
Eber SW,Dünnwald M,Belohradsky BH,Bidlingmaier F,Schievelbein H,Weinmann HM,Krietsch KGdoi
10.1111/j.1365-2362.1979.tb00923.xkeywords:
subject
Has Abstractpub_date
1979-06-01 00:00:00pages
195-202issue
3eissn
0014-2972issn
1365-2362journal_volume
9pub_type
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