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 Blood, 15 January 2006, Vol. 107, No. 2, pp. 435-443.
Prepublished online as a Blood First Edition Paper on August 18, 2005; DOI 10.1182/blood-2005-05-2113.

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REVIEW ARTICLES

Regulation of human fetal hemoglobin: new players, new complexities

Arthur Bank

From the Departments of Medicine and of Genetics and Development, Columbia University, New York, NY.

The human globin genes are among the most extensively characterized in the human genome, yet the details of the molecular events regulating normal human hemoglobin switching and the potential reactivation of fetal hemoglobin in adult hematopoietic cells remain elusive. Recent discoveries demonstrate physical interactions between the {beta} locus control region and the downstream structural {gamma}- and {beta}-globin genes, and with transcription factors and chromatin remodeling complexes. These interactions all play roles in globin gene expression and globin switching at the human {beta}-globin locus. If the molecular events in hemoglobin switching were better understood and fetal hemoglobin could be more fully reactivated in adult cells, the insights obtained might lead to new approaches to the therapy of sickle cell disease and {beta} thalassemia by identifying specific new targets for molecular therapies.


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