Regulation of the globin genes

Pediatric Research
Antonio Cao, Paolo Moi

Abstract

The a- and b-globin gene clusters are subject to several levels of regulation. They are expressed exclusively in the erythroid cells, only during defined periods of development and in a perfectly tuned way, assuring, at any stage of ontogeny, a correct balance in the availability of a- and b-globin chains for hemoglobin assembling. Such a tight control is dependent on regulatory regions of DNA located either in proximity or at great distances from the globin genes in a region characterized by the presence of several DNAse I hypersensitive sites and known as the Locus Control Region. All these sequences exert stimulatory, inhibitory or more complex activities by interacting with transcription factors that bridge these regions of DNA to the RNA polymerase machinery. Many of these factors have now been cloned and the corresponding mouse genes inactivated, shading new light on the metabolic pathways they control. It is increasingly recognized that such factors are organized into hierarchies according to the number of genes and circuits they regulate. Some genes such as GATA-1 and 2 are master regulators that act on large numbers of genes at early stage of differentiation whereas others, like EKLF, stand on the lowest step and contr...Continue Reading

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