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Related Concept Videos

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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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Studying Muscle Transcriptional Dynamics at Single-molecule Scales in Drosophila
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Essential role for Dicer during skeletal muscle development.

Jason R O'Rourke1, Sara A Georges, Howard R Seay

  • 1Department of Molecular Genetics and Microbiology and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610-0266, USA.

Developmental Biology
|October 16, 2007
PubMed
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Dicer enzyme activity is crucial for embryonic skeletal muscle development. Loss of Dicer in developing muscles leads to reduced microRNAs, abnormal muscle structure, and perinatal death in mice.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • microRNAs (miRNAs) are key regulators of gene expression, influencing processes like organogenesis.
  • Dicer is an essential enzyme for processing miRNA precursors into mature, functional miRNAs.
  • Skeletal muscle development relies on precise gene regulation, but the role of Dicer and miRNAs is not fully understood.

Purpose of the Study:

  • To investigate the function of Dicer and miRNAs in mammalian skeletal muscle development.
  • To determine the consequences of eliminating Dicer activity specifically within the myogenic lineage during embryogenesis.

Main Methods:

  • Generation of Dicer muscle mutants by eliminating Dicer activity in the myogenic compartment during embryogenesis.
  • Analysis of miRNA levels, skeletal muscle mass, myofiber morphology, and apoptosis in Dicer mutant mice.
  • Cre-mediated deletion of Dicer in Myod-converted myoblasts to assess cell death.

Main Results:

  • Dicer activity is essential for normal embryonic muscle development.
  • Dicer mutant mice exhibited reduced muscle miRNAs, perinatal lethality, decreased skeletal muscle mass, and abnormal myofiber morphology.
  • Increased apoptosis was observed in Dicer mutant muscles, and Dicer loss in myoblasts enhanced cell death.

Conclusions:

  • Dicer plays a critical role in skeletal muscle development.
  • miRNAs are implicated as essential components for embryonic myogenesis, mediated by Dicer activity.