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Related Experiment Video

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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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Sox7 is regulated by ETV2 during cardiovascular development.

Ann N Behrens1, Claudia Zierold, Xiaozhong Shi

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ETV2 directly regulates SOX7, a key factor in endothelial development. This interaction is crucial for vasculogenesis and angiogenesis during embryogenesis, impacting blood vessel formation.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Vasculogenesis and angiogenesis are critical early embryonic processes.
  • ETV2 and SOX7 are known to influence endothelial development.
  • The precise mechanistic interaction between ETV2 and SOX7 remained undefined.

Purpose of the Study:

  • To elucidate the mechanistic interaction between ETV2 and SOX7 in endothelial development.
  • To determine if ETV2 directly regulates SOX7 transcription.
  • To investigate the functional consequences of this interaction on endothelial progenitor cells and angiogenesis.

Main Methods:

  • Analysis of concomitant expression of Etv2 and Sox7 in endothelial progenitor cells.
  • Chromatin immunoprecipitation (ChIP) assays to identify ETV2 binding sites in the Sox7 regulatory region.
  • Over-expression and knockdown (shRNA) studies in embryonic bodies (EBs) to assess functional effects.
  • Quantification of endothelial progenitor cell formation and angiogenic sprouting.

Main Results:

  • Concomitant expression of Etv2 and Sox7 was confirmed in endothelial progenitor cells.
  • ETV2 was identified as a direct upstream regulator of Sox7, binding to its regulatory region and activating transcription.
  • SOX7 over-expression mimicked ETV2's effect, increasing endothelial progenitor cells in EBs.
  • Sox7 knockdown blocked ETV2-induced increases in endothelial progenitor cell formation and angiogenic sprouting.

Conclusions:

  • ETV2 directly regulates Sox7 transcription.
  • ETV2 controls endothelial development by modulating transcriptional networks, including Sox7.
  • The ETV2-Sox7 axis is a key regulator of vasculogenesis and angiogenesis.