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Related Experiment Videos

Zebrafish hox clusters and vertebrate genome evolution

A Amores1, A Force, Y L Yan

  • 1Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA.

Science (New York, N.Y.)
|November 30, 1998
PubMed
Summary

Zebrafish possess seven HOX gene clusters, more than mammals. This finding suggests whole genome duplication events in teleost evolution, impacting developmental gene regulation.

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Area of Science:

  • Developmental Biology
  • Evolutionary Genetics
  • Comparative Genomics

Background:

  • HOX genes are crucial for establishing the anterior-posterior axis in animal development.
  • Mammals possess four HOX gene clusters, contrasting with one in invertebrate chordates, hinting at gene cluster duplication in vertebrate evolution.

Purpose of the Study:

  • To investigate the number and evolutionary history of HOX gene clusters in zebrafish.
  • To understand the role of genome duplication in the expansion of HOX gene clusters within teleosts.

Main Methods:

  • Phylogenetic analysis of HOX gene sequences.
  • Genetic mapping of HOX gene clusters in zebrafish.
  • Comparative genomics to infer whole genome duplication events.

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Main Results:

  • Zebrafish were found to have seven HOX gene clusters.
  • Phylogenetic and genetic mapping data suggest a whole genome duplication event occurred after the divergence of ray-finned and lobe-finned fishes.
  • This duplication predates the teleost radiation, leading to an expansion of HOX clusters in this diverse vertebrate group.

Conclusions:

  • Teleosts, the most speciose vertebrate group, have a higher number of HOX gene clusters than mammals.
  • Whole genome duplication played a significant role in the evolution and expansion of HOX gene clusters in teleosts.
  • The increased number of HOX clusters in teleosts may have implications for their developmental complexity despite a less complex anterior-posterior axis compared to mammals.