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Related Experiment Videos

SPC4/PACE4 regulates a TGFbeta signaling network during axis formation.

D B Constam1, E J Robertson

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138 USA.

Genes & Development
|May 16, 2000
PubMed
Summary

The proprotein convertase SPC4 (also known as PACE4) is crucial for early mouse embryo development. Its absence leads to severe axis patterning defects, including situs ambiguus and craniofacial malformations.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Vertebrate anteroposterior (A/P) and left-right (L/R) axis specification relies on TGFbeta signals like Nodal, Lefty, and BMPs.
  • Proprotein convertase SPC1/Furin likely mediates endoproteolytic maturation of these signaling molecules.
  • SPC4 (PACE4) is a related proprotein convertase that may regulate precursor processing.

Purpose of the Study:

  • To investigate the role of SPC4 (PACE4) in early mouse embryonic patterning.
  • To determine the genetic and molecular mechanisms underlying SPC4's function in axis formation.

Main Methods:

  • Analysis of SPC4-deficient mouse embryos.
  • Gene expression analysis during early somite stages.
  • Genetic interaction studies and chimeric embryo analysis.

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Main Results:

  • Embryos lacking SPC4 exhibited situs ambiguus with left pulmonary isomerism or craniofacial defects like cyclopia.
  • spc4 was found to be genetically upstream of nodal, pitx2, lefty1, and lefty2.
  • SPC4 appears critical for maintaining Nodal and BMP signaling balance in the lateral plate for L/R axis formation.
  • SPC4 acts in the foregut during A/P axis formation, as indicated by genetic interactions and chimeric embryo studies.

Conclusions:

  • SPC4 (PACE4) plays a significant role in patterning the early mouse embryo.
  • SPC4 is essential for both L/R axis determination and A/P axis formation.
  • Dysregulation of SPC4 function can lead to severe developmental abnormalities.