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Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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SOX-partner code for cell specification: Regulatory target selection and underlying molecular mechanisms.

Hisato Kondoh1, Yusuke Kamachi

  • 1Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan. kondohh@fbs.osaka-u.ac.jp

The International Journal of Biochemistry & Cell Biology
|September 15, 2009
PubMed
Summary

SOX proteins and partner factors form complexes that regulate gene expression, controlling cell differentiation and development. Swapping partners alters gene expression, driving developmental transitions and stabilizing cell states.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • SOX proteins are crucial transcription factors involved in cell differentiation.
  • Their function typically necessitates cooperation with DNA-binding partner factors.
  • Specific SOX-partner pairs dictate cell-specific gene expression patterns.

Purpose of the Study:

  • To review the in vivo evidence and molecular mechanisms of SOX-partner factor complexes.
  • To elucidate the role of SOX-partner interactions in cell specification.
  • To understand how these complexes regulate gene expression during development.

Main Methods:

  • Review of existing in vivo studies on SOX-partner interactions.
  • Analysis of molecular mechanisms underlying cooperative DNA binding.
  • Examination of protein-protein interactions dependent on DNA binding.

Main Results:

  • SOX-partner pairs select specific regulatory target genes, defining cell differentiation states.
  • Examples include SOX2-OCT3/4 in embryonic stem cells and SOX2-PAX6 in visual system development.
  • Exchanging components of SOX-partner pairs triggers developmental transitions.
  • Autoregulation by SOX-partner pairs stabilizes cell/tissue states.

Conclusions:

  • SOX-partner complexes establish a cell specification code through cooperative DNA binding and protein interactions.
  • These interactions are fundamental to developmental processes and cell fate determination.
  • Understanding these mechanisms provides insight into developmental biology and potential therapeutic targets.