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Related Experiment Videos

Defining the mammalian CArGome.

Qiang Sun1, Guang Chen, Jeffrey W Streb

  • 1Cardiovascular Research Institute, University of Rochester School of Medicine, Rochester, NY 14642, USA.

Genome Research
|December 21, 2005
PubMed
Summary
This summary is machine-generated.

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This study identifies new genes regulated by serum response factor (SRF) and its CArG box DNA binding site. The findings reveal SRF

Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • Serum response factor (SRF) binds CArG boxes, primarily in muscle and growth-factor genes.
  • The complete set of functional CArG elements (CArGome) in the genome is not fully defined.

Purpose of the Study:

  • To perform a genome-wide screen to define the functional mammalian CArGome.
  • To identify novel SRF-dependent genes and understand SRF's role in cytoskeletal homeostasis.

Main Methods:

  • Comparative genomic analysis of human and mouse genes to identify conserved CArG elements near transcription start sites.
  • Experimental validation of predicted SRF targets using luciferase reporter assays, gel shifts, chromatin immunoprecipitation, and RNAi knockdown.
  • Analysis of SRF's impact on cytoskeletal gene expression and cell cytoarchitecture.

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Main Results:

  • Identified over 100 hypothetical SRF-dependent genes with conserved CArG elements.
  • Validated 67% (60/89) of the predicted SRF targets.
  • Discovered that 26 validated genes encode cytoskeletal/contractile or adhesion proteins, and SRF knockdown perturbs cell cytoarchitecture.

Conclusions:

  • SRF is a master regulator of the actin cytoskeleton.
  • Expanded the mammalian CArGome, highlighting SRF's role in cytoskeletal homeostasis through regulation of cyto-contractile genes.