Summary
To elucidate the cellular basis of hemoglobin transition inXenopus laevis the distribution of larval and adult hemoglobins was analyzed by indirect immunofluorescence in the circulating erythrocytes during metamorphosis. In addition, the morphological characteristics as well as the capacity for synthesis of DNA and hemoglobin in the erythrocytes were followed during the same developmental period. Our quantitative analysis on the distribution of larval and adult hemoglobins suggests that they are localized in different cells. Hemoglobin transition, therefore, most likely reflects replacement of the larval erythrocyte population by new cells which are committed to adult globin synthesis. Since hemoglobin transition is not accompanied by an increase in the abundance of immature erythroid cells with active DNA synthesis, we assume that the presumptive adult erythroid cells are released into circulation at a relatively advanced stage of maturation. The decline in the synthesis of DNA and larval hemoglobin further indicates that cessation of cell renewal in the larval erythrocyte population may represent a decisive step in hemoglobin transition.
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Weber, R., Geiser, M., Müller, P. et al. The metamorphic switch in hemoglobin phenotype ofXenopus laevis involves erythroid cell replacement. Roux's Arch Dev Biol 198, 57–64 (1989). https://doi.org/10.1007/BF02447740
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DOI: https://doi.org/10.1007/BF02447740