Abstract
Long-term cultures of K562(S) cells in 50-75 microM hemin allow the selection of 'hemin-resistant' K562 cells together with cells which proliferate efficiently while fully induced to express the human embryonic globin genes, as the hemoglobin Gower 1 (zeta 2 epsilon 2) is the predominant hemoglobin produced. Our experiments demonstrate that these K562 cells accumulate mostly epsilon-globin mRNA (epsilon-globin mRNA/gamma-globin mRNA = 2.9) suggesting that the control of hemoglobin expression is at a pretranslational level.
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