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Related Experiment Videos

Serum response factor binding sites differ in three human cell types.

Sara J Cooper1, Nathan D Trinklein, Loan Nguyen

  • 1Department of Genetics, Stanford University School of Medicine, Stanford, California 94305-5120, USA.

Genome Research
|January 4, 2007
PubMed
Summary
This summary is machine-generated.

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Serum response factor (SRF) binding sites vary by cell type, revealing its diverse roles in development and cell maintenance. SRF cofactors, not epigenetics, likely dictate cell-specific binding, impacting gene regulation.

Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Serum response factor (SRF) is crucial for embryonic development, muscle, and neuronal cell maintenance.
  • The precise mechanisms governing SRF's control over diverse cellular pathways remain largely unknown.
  • Understanding cell-type-specific SRF binding is key to elucidating its regulatory functions.

Purpose of the Study:

  • To map genome-wide SRF binding sites.
  • To identify SRF binding sites that exhibit cell-type-specific occupancy.
  • To investigate potential mechanisms, including cofactor binding and epigenetic modifications, that influence differential SRF binding.

Main Methods:

  • Genome-wide identification of SRF binding sites using chromatin immunoprecipitation (ChIP) coupled with human promoter microarrays.

Related Experiment Videos

  • Quantitative PCR (qPCR) for validation of identified SRF binding sites.
  • Assays for cofactor binding, DNA methylation, histone methylation, and histone acetylation at a subset of sites.

    • Main Results:

    • Identified 216 putative SRF binding sites, with 146 validated at >90% confidence.
    • Nearly half of SRF binding sites showed cell-type-specific occupancy, highlighting SRF's diverse roles.
    • SRF cofactors, rather than epigenetic modifications, were proposed as key determinants of cell-dependent SRF binding.
    • ELK4 (SRF-associated protein-1) binding correlated with common SRF sites across all tested cell types.

    Conclusions:

    • SRF exhibits significant cell-type-specific binding patterns, underscoring its multifaceted roles in cellular processes.
    • SRF cofactors appear to play a critical role in regulating cell-dependent SRF binding.
    • This study provides a comprehensive understanding of the SRF regulatory network and its cell-specific control.