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Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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Single Cell Fate Mapping in Zebrafish
07:53

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Published on: October 5, 2011

Zebrafish microRNA-126 determines hematopoietic cell fate through c-Myb.

C Grabher1, E M Payne, A B Johnston

  • 1Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA. clemens.grabher@kit.edu

Leukemia
|November 17, 2010
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Summary

MicroRNAs (miRNAs) precisely regulate blood cell development. This study identifies miR-126 as a key regulator of c-Myb, influencing red blood cell and platelet production during hematopoiesis.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Hematopoiesis

Background:

  • Transcription factors precisely control cell fate during blood development.
  • Understanding microRNA (miRNA) roles in hematopoiesis is crucial for precise cellular regulation.

Purpose of the Study:

  • To identify novel regulators of transcription factors during definitive hematopoiesis.
  • To elucidate the role of miR-126 in regulating the proto-oncogene c-myb.
  • To investigate the combined function of miR-126 and miR-150 in cell lineage specification.

Main Methods:

  • In vivo knockdown of miR-126 in hematopoietic stem cells.
  • Analysis of c-Myb expression levels.
  • Assessment of erythropoiesis and thrombopoiesis.
  • Evaluation of cell lineage specification between erythroid and megakaryocytic fates.

Main Results:

  • Knockdown of miR-126 increased c-Myb levels in vivo.
  • miR-126 knockdown promoted erythropoiesis at the expense of thrombopoiesis.
  • Concerted action of miR-126 and miR-150 is required for precise cell fate decisions between erythroid and megakaryocytic lineages.
  • Both miRNAs are necessary, but not sufficient individually, for regulating these cell fate decisions.

Conclusions:

  • miR-126 is a novel physiological regulator of c-myb during definitive hematopoiesis.
  • miRNAs provide precision to developmental programs and control gene function variability in hematopoiesis.
  • miR-126 and miR-150 are essential for accurate cell lineage specification in blood development.