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Comparative genomics on SOX2 orthologs

Yuriko Katoh1, Masaru Katoh

  • 1M&M Medical BioInformatics, Hongo 113-0033, Japan.

Oncology Reports
|August 4, 2005
PubMed

Insights

SOX2 and POU5F1 (OCT3 or OCT4) are key transcription factors in embryonic stem cells. Comparative genomics and proteomics reveal conserved SOX2 protein domains and regulatory elements across vertebrates, highlighting its evolutionary importance.

Area of Science:

  • Stem cell biology
  • Genomics
  • Proteomics
  • Evolutionary biology

Background:

  • SOX2 and POU5F1 (OCT3 or OCT4) transcription factors regulate FGF4 expression in embryonic stem (ES) cells.
  • SOX2, POU5F1, and FGF4 are crucial for the integrome network in oncology and stem cell biology.
  • The SOX gene family includes SOX2, SOX1, and SOX3, forming a distinct subfamily.

Purpose of the Study:

  • To identify and characterize rat Sox2 and Xenopus sox2 genes using bioinformatics.
  • To perform comparative genomics and proteomics analyses on SOX2 orthologs.
  • To investigate the evolutionary conservation of SOX2 and its regulatory elements.

Main Methods:

  • Bioinformatics analysis of rat and Xenopus sox2 genes.
  • Comparative genomics and proteomics for amino-acid identity and domain analysis.
  • Identification and comparison of conserved transcription factor binding sites in SOX2 promoters.

Main Results:

  • Rat Sox2 gene encodes a 319-aa protein; Xenopus tropicalis sox2 encodes a 311-aa protein.
  • High amino-acid identity observed between rat Sox2 and orthologs from mouse, human, chicken, Xenopus, and zebrafish.
  • A novel SOX123C domain was identified, conserved in vertebrate SOX1, SOX2, and SOX3 orthologs, alongside the HMG box.
  • Conserved SOX9, TCF/LEF, POU2F1, and COMP1 binding sites were found in human, rat, and mouse SOX2 promoters.
  • SOX2 mRNA expression detected in ES cells, fetal brain, and various tumors.

Conclusions:

  • SOX2 protein and its promoter are highly conserved during vertebrate evolution due to its role in early embryogenesis.
  • Comparative integromics analyses reveal conserved domains and regulatory elements in SOX2 orthologs.
  • SOX2 plays a pivotal role in stem cell biology and is implicated in various cancers.

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