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Related Experiment Videos

Animal evolution: when did the 'Hox system' arise?

Chris T Amemiya1, Günter P Wagner

  • 1Molecular Genetics Program, Benaroya Research Institute at Virginia Mason, Seattle, Washington 98101, USA. camemiya@benaroyaresearch.org

Current Biology : CB
|July 25, 2006
PubMed
Summary
This summary is machine-generated.

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The Hox gene system, crucial for animal development, likely evolved after the split from early animal lineages. This suggests complex body patterning can occur without the strict Hox system.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • The evolution of Hox gene clusters and their developmental roles are central to understanding animal origins.
  • Cnidarians, as early branching animals, offer insights into pre-bilaterian gene organization.

Discussion:

  • Hox-like genes in cnidarians challenge the notion of an ancient, pre-bilaterian origin for the canonical Hox system.
  • This finding suggests that the 'Hox system', sensu stricto, is not a prerequisite for complex axial patterning.

Key Insights:

  • The study interprets cnidarian Hox-like genes as evidence for a post-bilaterian origin of the strict Hox system.
  • Complex axial patterning in animals may have evolved independently of the canonical Hox gene cluster system.

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Outlook:

  • Further research into cnidarian and other non-bilaterian genomes can clarify the evolutionary trajectory of developmental gene toolkits.
  • Understanding the functional roles of Hox-like genes in cnidarians will illuminate alternative mechanisms for establishing body axes.