Erythrocyte pyruvate kinase deficiency: a kinetic method for differentiation between heterozygosity and compound-heterozygosity.

Abstract:

:The goal of the present study was to search for criteria that allow one to distinguish between normal individuals and heterozygotes as well as compound heterozygotes for pyruvate kinase (PK) deficiency. As the residual activity of PK with heterozygotes was between 35% and 110% of the normal activity, it was necessary to find other methods to prove heterozygosity. The PK in the hemolysates of 23 patients suffering from PK deficiency, 36 paternal and maternal enzymes as well as the enzymes of five heterozygous and four normal siblings together with those of 20 normal individuals, were studied according to the recommendations of the International Committee for Standardization in Haematology. The following hematological and enzyme kinetic parameters can serve to identify heterozygotes for PK deficiency: 1) a slight reticulocytosis, 2) an up-to-twofold increase of the intracellular concentrations of glucose-6-phosphate in the erythrocyte, 3) a mixed cooperativity of the phosphoenolpyruvate (PEP)-binding process of PK, 4) a decreased nucleotide specificity with guanosine diphosphate and uridine diphosphate, and 5) a lowered affinity for adenosine diphosphate. The most significant criterium found with all heterozygotes was a mixed cooperativity of the PEP-binding process caused by the presence of a mixture of normal and mutant PK.

journal_name

Am J Hematol

authors

Lakomek M,Winkler H,Linne S,Schröter W

doi

10.1002/ajh.2830310402

subject

Has Abstract

pub_date

1989-08-01 00:00:00

pages

225-32

issue

4

eissn

0361-8609

issn

1096-8652

journal_volume

31

pub_type

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