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Two fetal hemoglobin variants affecting the same residue: Hb F-Emirates [G gamma 59(E3)Lys-->Glu] and Hb F-Sacromonte

S Abbes1, P A Fitzgerald, E Varady

  • 1Département de Biochimie, Faculté de Médicine de Tunis.

Hemoglobin
|May 1, 1995
PubMed

Insights

Two novel fetal hemoglobin variants, Hb F-Emirates and Hb F-Sacromonte, were identified in newborns. Structural analysis revealed these variants result from mutations at the G gamma chain

Area of Science:

  • Biochemistry
  • Genetics
  • Hematology

Background:

  • Fetal hemoglobin (Hb F) plays a crucial role in oxygen transport during fetal development.
  • Variations in Hb F can have implications for understanding hemoglobinopathies and red blood cell disorders.
  • Identifying novel Hb F variants aids in characterizing the diversity of human hemoglobin.

Observation:

  • Two distinct, fast-moving fetal hemoglobin variants were detected in apparently healthy newborns.
  • One variant, Hb F-Emirates, was found in a newborn from the United Arab Emirates.
  • The second variant, Hb F-Sacromonte, was identified in a newborn from France.

Findings:

  • Detailed protein chemistry analysis using miniaturized techniques was employed.
  • Both mutations were found to affect the same residue (lysine at position 59, E3) on the G gamma chain.
  • In Hb F-Emirates, lysine at position 59 was replaced by glutamic acid.
  • In Hb F-Sacromonte, lysine at position 59 was replaced by glutamine.

Implications:

  • These findings expand the known spectrum of fetal hemoglobin variants.
  • Understanding these specific mutations contributes to the detailed structural and functional characterization of hemoglobin.
  • The discovery highlights the utility of advanced protein chemistry techniques in identifying rare genetic variants.

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