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Related Experiment Videos

Comparative genomics on Sonic hedgehog orthologs.

Yuriko Katoh1, Masaru Katoh

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

Oncology Reports
|September 6, 2005
PubMed
Summary

Sonic hedgehog (SHH) and its orthologs are crucial in oncology and regenerative medicine. Comparative genomics revealed conserved domains and regulatory elements in SHH, highlighting its evolutionary importance.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • The Hedgehog signaling pathway, involving Sonic hedgehog (SHH), Indian hedgehog (IHH), and Desert hedgehog (DHH), is fundamental in oncology and regenerative medicine.
  • Key components include ligands, Patched receptors, and Smoothened (SMO) which initiates downstream GLI transcription factors.
  • KIF27 and KIF7 are identified as human homologs of Drosophila Costal-2, interacting with SMO and other pathway proteins.

Purpose of the Study:

  • To perform comparative proteomics and genomics analyses on SHH orthologs using bioinformatics.
  • To assemble a representative human SHH transcript and identify its genomic location.
  • To investigate the evolutionary conservation of SHH domains and its promoter region.

Main Methods:

  • Comparative proteomics and comparative genomics analyses.
  • Bioinformatic assembly of human SHH transcript using EST and RefSeq databases.
  • Identification and comparison of SHH orthologs across species, including domain architecture and promoter sequence analysis.

Main Results:

  • Human SHH mRNA was found to be expressed in fetal brain, infant brain, and colorectal cancer.
  • Comparative analysis revealed conserved domain architecture and specific amino-acid substitutions (E284G, T416P) in human and chimpanzee SHH.
  • An evolutionarily conserved SHH promoter region was identified, containing conserved regulatory elements like double bHLH binding sites, CCAAT box, and TATA box across species.

Conclusions:

  • SHH orthologs share a common domain structure essential for their function.
  • The identified conserved promoter elements suggest crucial regulatory roles for SHH across vertebrates.
  • These findings provide insights into the molecular basis of Hedgehog signaling in development and disease.

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