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Regulation of murine TGFbeta2 by Pax3 during early embryonic development

Chandra S K Mayanil1, Angela Pool, Hiromichi Nakazaki

  • 1Laboratory of Neural Tube Research, Department of Pediatric Neurosurgery, Children's Memorial Research Center and Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60614, USA. smayanil@northwestern.edu

The Journal of Biological Chemistry
|June 22, 2006
PubMed

Insights

Paired box 3 (Pax3) directly regulates Transforming growth factor beta 2 (TGFbeta2) transcription by binding to its promoter. This interaction is crucial for TGFbeta2 expression and may play a key role in embryonic development, particularly in preventing neural tube defects.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Previous studies identified Transforming growth factor beta 2 (TGFbeta2) as a potential target of Paired box 3 (Pax3).
  • Pax3 is a transcription factor known to be involved in various developmental processes.

Purpose of the Study:

  • To investigate the direct regulatory mechanism of Pax3 on TGFbeta2 transcription.
  • To elucidate the role of Pax3-mediated TGFbeta2 regulation in embryonic development.

Main Methods:

  • Chromatin immunoprecipitation (ChIP) to detect Pax3 binding to the TGFbeta2 promoter.
  • Reporter gene assays (luciferase activity) and electrophoretic mobility shift assays (EMSA) to confirm direct binding.
  • Co-immunoprecipitation (Co-IP) and ChIP to analyze protein-DNA interactions and epigenetic modifications (acetylation, histone deacetylases).
  • Whole mount in situ hybridization and quantitative real-time reverse transcription-PCR (qRT-PCR) in Pax3 knockout mouse embryos.

Main Results:

  • Pax3 directly binds to specific cis-regulatory elements on the TGFbeta2 promoter.
  • Pax3 binding is associated with epigenetic modifications, including acetylation and the involvement of p300/CBP, histone deacetylases (HDAC1), and SIRT1.
  • TGFbeta2 transcript levels are significantly reduced in Pax3-deficient (Pax3(-/-)) mouse embryos, which exhibit neural tube defects.

Conclusions:

  • Pax3 directly controls TGFbeta2 gene transcription through promoter binding.
  • The interaction between Pax3 and TGFbeta2 is implicated in normal embryonic development, potentially by influencing neural tube formation.
  • Dysregulation of this pathway may contribute to developmental abnormalities like neural tube defects.

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