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Molecular evolution of the EGF-CFC protein family

V Ravisankar1, Taran P Singh, Narayanan Manoj

  • 1Department of Biotechnology, Indian Institute of Technology Madras, Chennai 600036, India. btdcf2@iitm.ac.in

Gene
|June 7, 2011
PubMed

Insights

The study reveals the evolutionary origins of Epidermal Growth Factor-Cripto-1/FRL-1/Cryptic (EGF-CFC) proteins, tracing their appearance to deuterostome ancestors. It identifies key evolutionary changes driving functional divergence in mammalian EGF-CFC subfamilies.

Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Genomics

Background:

  • Epidermal Growth Factor-Cripto-1/FRL-1/Cryptic (EGF-CFC) proteins are crucial for Nodal signaling in vertebrate embryogenesis.
  • EGF-CFC proteins are implicated in human tumorigenesis, but their evolutionary history is poorly understood.

Purpose of the Study:

  • To investigate the evolutionary origin, conservation, and relationships of EGF-CFC proteins across metazoa.
  • To identify molecular mechanisms underlying functional divergence between mammalian EGF-CFC paralogs.

Main Methods:

  • Phylogenetic analysis of EGF-CFC protein sequences across diverse metazoan species.
  • Site-specific evolutionary rate shift analyses comparing mammalian Cripto and Cryptic subfamilies.

Main Results:

  • The EGF-CFC gene first appeared in the ancestor of deuterostomes.
  • Phylogenetic analysis revealed distinct EGF-CFC subfamilies evolved via lineage-specific duplication and divergence.
  • Critical amino acid sites, particularly in the CFC domain, were identified as drivers of functional divergence between Cripto and Cryptic paralogs.

Conclusions:

  • The study elucidates the deep evolutionary roots and diversification patterns of the EGF-CFC protein family.
  • Understanding the molecular evolution of EGF-CFC proteins provides insights into their roles in development and disease.

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