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  • Title: Origin of human triosephosphate isomerase isozymes: further evidence for the single structural locus hypothesis with Japanese variants.
    Author: Asakawa J, Iida S.
    Journal: Hum Genet; 1985; 71(1):22-6. PubMed ID: 3861565.
    Abstract:
    Four electrophoretic variants of human erythrocyte triosephosphate isomerase (TPI) have been studied to investigate the origin of the multiple forms of human TPI, in particular the constitutive TPI-B isozyme and the cell division-associated TPI-A isozyme. The variant phenotype expressed by the constitutive TPI-B isozyme in both erythrocytes and peripheral lymphocytes was also expressed by the cell division-associated isozymes in mitogen-stimulated lymphocytes and hair root cells. These results strongly support the hypothesis of Decker and Mohrenweiser (1981) that TPI-B and TPI-A originated from the same structural gene. We also found that the isozyme e is different from TPI-A with respect to both its electrophoretic mobility and heat stability. This finding is in contrast to the recent conclusion of Yuan et al. (1981) that both the isozyme e and TPI-A are deamidation products of TPI-B.
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