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Induction of β-Globin Synthesis in the β-Thalassaemia of Ferrara

Abstract

THALASSAEMIAS are inherited disorders each characterized by a slow rate of synthesis of a specific polypeptide chain of haemoglobin, the most extensively studied being beta-thalassaemia, in which beta-globin synthesis is deficient. Homozygotes for beta-thalassaemia from most of the Mediterranean region synthesize some beta-globin1,2, homozygotes from the Ferrara region synthesize none3,4. In the common Mediterranean form there is some evidence for a defect in the quantity or quality of β-globin rnRNA5,6. Failure to synthesize beta-globin could be due to defective transcription, defective translation, which could result from the absence of mechanism specific for the translation of beta-globin mRNA7–11, which probably operates at chain initiation12–14, or incomplete translation, involving a mutation in beta-globin mRNA of an amino-acid-specifying codon to an initiation or termination codon. Dreyfus et al.15 found that reticulocytes of beta-thalassaemic subjects from Ferrara incorporated no radioactive amino-acids in the tryptic peptides beta-T1 (NH2-terminal) and beta-T14 (immediately adjacent to the COOH-terminal). These findings exclude the insertion of a terminating triplet after the codon for the eighth amino-acid and of an initiating signal before the codon for the 133rd amino-acid.

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CONCONI, F., ROWLEY, P., DEL SENNO, L. et al. Induction of β-Globin Synthesis in the β-Thalassaemia of Ferrara. Nature New Biology 238, 83–87 (1972). https://doi.org/10.1038/newbio238083a0

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