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Transcriptional regulation by Pax3 and TGFbeta2 signaling: a potential gene regulatory network in neural crest

Hiromichi Nakazaki1, Yueh-Wei Shen, Beth Yun

  • 1Laboratory of Neural Tube Research, Department of Pediatric Neurosurgery, Childrens Memorial Research Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60614, USA.

The International Journal of Developmental Biology
|January 6, 2009
PubMed

Insights

Pax3 and TGFbeta2 interaction reverses neural tube defects. Down-regulating Pax3 in TGFbeta2 nullizygous embryos restores normal neural tube closure, revealing a gene regulatory network.

Area of Science:

  • Developmental biology
  • Molecular genetics

Background:

  • Pax3 is crucial for neural crest development and cell migration.
  • Transforming growth factor-beta (TGF-β) signaling pathways influence neural crest cell migration and differentiation.
  • TGF-β2 nullizygous embryos exhibit neural tube defects, including an open neural tube and bifid spine.

Purpose of the Study:

  • To investigate the interaction between Pax3 and TGF-β2 in neural crest development.
  • To elucidate the regulatory relationship between Pax3 and TGF-β2.
  • To identify downstream effector genes involved in the phenotypic reversal.

Main Methods:

  • Genetic manipulation through breeding of TGFb2(+/-)Pax3(+/-) mice.
  • Phenotypic analysis of embryos, including neural tube closure and spinal development.
  • Analysis of gene expression patterns of potential downstream effectors.

Main Results:

  • TGF-β2 nullizygous phenotype is reversed to wild-type in TGFbeta2(-/-)Pax3(+/-) embryos.
  • Pax3 directly regulates TGF-β2 expression by binding to its promoter.
  • Evidence suggests a coordinated gene regulatory network involving Pax3, TGF-β2, and downstream effectors like Hes1, Ngn2, and Sox9.

Conclusions:

  • Pax3 and TGF-β2 function in a coordinated gene regulatory network to control neural crest development.
  • The interaction between Pax3 and TGF-β2 is critical for proper neural tube closure.
  • Downstream genes involved in neuronal differentiation are likely effectors in this network.

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