Abstract
To examine the switch from fetal to adult hemoglobin at the cellular level, erythroid progenitor cells from newborn infants and adults were cultured in methyl cellulose with erythropoietin. Individual erythroid colonies were labeled with [3H]leucine at various times, and globin synthesis patterns examined by gel electrophoresis and fluorography. The percent gamma- or beta-globin synthesis was determined from the total of gamma + beta, and the percent G gamma from the total of G gamma + A gamma. The nonparametric correlation coefficients of percent G gamma with percent gamma or beta were obtained. Each group of colonies at each time point was examined separately. In colonies from adult blood, the proportion of G gamma-synthesis did not correlate with the proportion of gamma-synthesis. Colonies from newborn blood fell into two groups. Those that developed from relatively mature progenitor cells, and were seen on day 14, showed a strong negative correlation of G gamma with beta-globin synthesis. However, those newborn colonies that developed from immature progenitors, and were seen later in culture (days 17 and 21), showed no correlation of G gamma with beta-synthesis. These findings are compatible with a clonal model for hemoglobin switching. Fetal progenitors, in which G gamma- and beta-syntheses are negatively correlated, are gradually replaced during ontogeny by adult progenitors. The adult progenitors produce more beta (less gamma), and the proportions of G gamma- and gamma- or beta-synthesis are not correlated.
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