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A Complex Lens for a Complex Eye.

Aaron L Stahl1, Regina S Baucom2, Tiffany A Cook3

  • 1Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221, USA.

Integrative and Comparative Biology
|October 10, 2017
PubMed
Summary

Researchers identified key proteins in the bifocal lenses of Thermonectus marmoratus larvae using transcriptomic and proteomic methods. This study reveals insights into the molecular basis of high-resolution vision evolution in insects.

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Area of Science:

  • * Developmental Biology
  • * Molecular Biology
  • * Evolutionary Biology

Background:

  • * Insect larvae exhibit a range of eye complexity, from simple light detection to high spatial resolution.
  • * The bifocal lenses of Thermonectus marmoratus larvae are notable for differentially focusing light onto distinct retinas.
  • * Limited research exists on the molecular composition of complex insect eye lenses, particularly bifocal types.

Purpose of the Study:

  • * To identify the major proteins constituting the principal bifocal lenses of Thermonectus marmoratus larvae.
  • * To investigate the cellular origins and potential mechanisms for structural differentiation in these lenses.
  • * To understand the molecular underpinnings of evolving high-resolution vision in insects.

Main Methods:

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  • * Transcriptomic and proteomic analyses were employed to identify lens proteins.
  • * Mass spectrometry was used to determine the protein composition of the lenses.
  • * In situ hybridization was performed to examine gene expression in corneagenous cells.

Main Results:

  • * Ten major lens proteins were identified, with six homologous to cuticular proteins found in other insect lenses.
  • * Two identified proteins were house-keeping genes, and two lacked homology to known genes.
  • * Differential gene expression was observed between distal and proximal corneagenous cells, suggesting a mechanism for bifocal lens formation.

Conclusions:

  • * The lens composition of T. marmoratus larvae involves co-opting transparent and optically dense proteins, similar to other animal lenses.
  • * Distinct expression patterns in corneagenous cells may explain the structural basis of the bifocal nature of these lenses.
  • * Understanding lens molecular composition offers insights into the evolution of focusing mechanisms and the development of high-resolution vision.