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5 - Molecular and Cellular Basis of Hemoglobin Switching

from SECTION ONE - THE MOLECULAR, CELLULAR, AND GENETIC BASIS OF HEMOGLOBIN DISORDERS

Published online by Cambridge University Press:  03 May 2010

Martin H. Steinberg
Affiliation:
Boston University
Bernard G. Forget
Affiliation:
Yale University, Connecticut
Douglas R. Higgs
Affiliation:
MRC Institute of Molecular Medicine, University of Oxford
David J. Weatherall
Affiliation:
Albert Einstein College of Medicine, New York
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Summary

INTRODUCTION

Hemoglobin switching is characteristic of all animal species that use hemoglobin for oxygen transport. Most species have only one switch, from embryonic to adult globin formation. Humans and a few other mammals have two globin gene switches, from embryonic to fetal globin coinciding with the transition from embryonic (yolk sac) to definitive (fetal liver) hematopoiesis and from fetal to adult globin formation, occurring around the perinatal period (Fig. 5.1; see Chapters 1 and 2). The switch from ε- to γ-globin production begins very early in gestation, as fetal hemoglobin (HbF) is readily detected in 5-week-old human embryos, and it is completed well before the 10th week of gestation. β-globin expression starts early in human development, and small amounts of adult hemoglobin (HbA) have been detected by biosynthetic or immunochemical methods even in the smallest human fetuses studied. In these fetuses γ- and β-globins are present in the same fetal red cells. β-chain synthesis increases to approximately 10% of total hemoglobin by 30–35 weeks of gestation. At birth, HbF comprises 60%–80% of the total hemoglobin. It takes approximately 2 years to reach the level of 0.5%–1% HbF that is characteristic of adult red cells. HbF in the adult is restricted to a few erythrocytes called “F cells” (see chapter 7). Approximately 3%–7% of erythrocytes are F cells and each contains approximately 4–8 pg of HbF.

Hemoglobin switching has been the target of intensive investigation for two reasons.

Type
Chapter
Information
Disorders of Hemoglobin
Genetics, Pathophysiology, and Clinical Management
, pp. 86 - 100
Publisher: Cambridge University Press
Print publication year: 2009

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