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Squid Pax-6 and eye development

S I Tomarev1, P Callaerts, L Kos

  • 1Laboratory of Molecular and Developmental Biology, National Eye Institute, National Institutes of Health, Bethesda, MD 20892-2730, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 18, 1997
PubMed
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Pax-6 gene is crucial for eye development in squid, with its RNA found in eyes and other organs. Squid Pax-6 can induce ectopic eye formation in fruit flies, supporting its conserved role in eye evolution.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Pax-6 is a critical gene for eye development in vertebrates and its homolog, eyeless, in Drosophila.
  • The role of Pax-6 in eye development across diverse animal phyla, particularly mollusks, remains less understood.

Purpose of the Study:

  • To investigate the function and expression of the Pax-6 gene in the eye development of mollusks, using the squid (Loligo opalescens) as a model.
  • To determine if squid Pax-6 can functionally substitute for its Drosophila homolog in eye development.

Main Methods:

  • Analysis of alternatively spliced RNA transcripts from a single Pax-6 gene in squid embryos.
  • Expression pattern analysis of Pax-6 RNA in embryonic squid tissues (eye, olfactory organ, brain, arms).
  • Functional assays involving the expression of squid Pax-6 in Drosophila to assess its ability to induce ectopic eye formation.

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Main Results:

  • Squid Pax-6 gene produces alternatively spliced RNAs expressed in embryonic eyes, olfactory organs, brains, and arms.
  • Despite sequence divergence outside conserved domains, squid Pax-6 successfully induced ectopic eye formation in Drosophila.
  • This demonstrates functional conservation of Pax-6 in eye development across distantly related species.

Conclusions:

  • Pax-6 plays a significant role in the development of complex sensory organs, including eyes and olfactory systems, in mollusks.
  • The conserved function of Pax-6 across vertebrates, insects, and mollusks highlights its fundamental importance in animal evolution.
  • Pax-6 related genes are essential for the formation of the eye and olfactory system throughout the animal kingdom.