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Related Experiment Videos

Intracellular signals for developmental hemoglobin switching.

L T Ramseyer1, J Barker-Harrel, D J Smith

  • 1Department of Biochemistry, University of Oklahoma Health Sciences Center, Oklahoma City 73190.

Developmental Biology
|May 1, 1989
PubMed
Summary

Scientists discovered conserved factors regulating hemoglobin switching by fusing frog and mouse cells. These trans-acting factors function across species, indicating highly conserved developmental mechanisms.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Hemoglobin switching is a critical developmental process where embryonic/fetal hemoglobin is replaced by adult hemoglobin.
  • Understanding the regulatory mechanisms of this switch is key to comprehending vertebrate development.

Purpose of the Study:

  • To identify and characterize trans-acting factors involved in developmental hemoglobin switching.
  • To investigate the conservation of these regulatory factors across different vertebrate species and developmental stages.

Main Methods:

  • Cell fusion experiments were performed between erythroid cells from different developmental stages and species (Xenopus laevis, Rana catesbeiana, and murine erythroleukemia cells).
  • Analysis of gene expression in transient heterokaryons using dot blots and Northern blots with specific globin probes.

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  • Detection of newly synthesized hemoglobin tetramers using native polyacrylamide gel electrophoresis.

    • Main Results:

    • Adult globin gene expression was detected in heterokaryons formed by fusing adult and tadpole erythroid cells.
    • Trans-acting factors regulating adult globin gene expression were found to function across different vertebrate classes (mammals and amphibians).
    • Evidence of conserved mechanisms controlling developmental hemoglobin switching was observed.

    Conclusions:

    • Developmental stage-specific trans-acting factors for globin genes are conserved across vertebrate classes.
    • The molecular mechanisms underlying developmental hemoglobin switching are highly conserved throughout vertebrate evolution.