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Scleraxis: a basic helix-loop-helix protein that prefigures skeletal formation during mouse embryogenesis

P Cserjesi1, D Brown, K L Ligon

  • 1Department of Biochemistry and Molecular Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.

Development (Cambridge, England)
|April 1, 1995
PubMed
Summary

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Scleraxis, a novel basic helix-loop-helix (bHLH) protein, is identified as a key regulator in skeletal development. Its expression pattern and DNA-binding activity suggest a crucial role in cartilage and connective tissue formation during embryogenesis.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Basic helix-loop-helix (bHLH) transcription factors control cell growth and differentiation.
  • Cell-type-specific bHLH proteins heterodimerize with ubiquitous partners like E12 to bind E-box DNA sequences.

Purpose of the Study:

  • To identify novel cell-type-specific bHLH proteins that interact with E12.
  • To characterize the function of a newly identified bHLH protein, scleraxis, during mouse embryogenesis.

Main Methods:

  • Yeast two-hybrid system screening of mouse embryo cDNA libraries.
  • Analysis of scleraxis gene expression patterns during embryogenesis.
  • Assays for DNA-binding and transcriptional activation.

Main Results:

Related Experiment Videos

  • A novel bHLH protein, scleraxis, was isolated.
  • Scleraxis transcripts were detected in sclerotome, mesenchymal cells, and precursors of the axial and appendicular skeleton.
  • Scleraxis binds the E-box as a heterodimer with E12 and activates transcription.

Conclusions:

  • Scleraxis expression precedes chondrogenesis and is restricted to cartilage and connective tissue formation sites.
  • Scleraxis acts as a regulator of gene expression in mesenchymal lineages.
  • The findings suggest scleraxis is vital for skeletal development.