Cited by 93Developmental Biology and Gene RegulationMarine Invertebrate Physiology and EcologyRetinal Development and Disorders

Stable transgenesis in the marine annelid Platynereis dumerilii sheds new light on photoreceptor evolution

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Backfisch, Benjamin, Veedin Rajan, Vinoth Babu, Fischer, Ruth M., Lohs, Claudia, Arboleda, Enrique, Tessmar-Raible, Kristin, Raible, Florian·2013·Proceedings of the National Academy of Sciences

Abstract

Research in eye evolution has mostly focused on eyes residing in the head. In contrast, noncephalic light sensors are far less understood and rather regarded as evolutionary innovations. We established stable transgenesis in the annelid Platynereis, a reference species for evolutionary and developmental comparisons. EGFP controlled by cis-regulatory elements of r-opsin, a characteristic marker for rhabdomeric photoreceptors, faithfully recapitulates known r-opsin expression in the adult eyes, and marks a pair of pigment-associated frontolateral eyelets in the brain. Unexpectedly, transgenic animals revealed an additional series of photoreceptors in the ventral nerve cord as well as photoreceptors that are located in each pair of the segmental dorsal appendages (notopodia) and project into the ventral nerve cord. Consistent with a photosensory function of these noncephalic cells, decapitated animals display a clear photoavoidance response. Molecular analysis of the receptors suggests that they differentiate independent of pax6, a gene involved in early eye development of many metazoans, and that the ventral cells may share origins with the Hesse organs in the amphioxus neural tube. Finally, expression analysis of opn4×-2 and opn4m-2, two zebrafish orthologs of Platynereis r-opsin, reveals that these genes share expression in the neuromasts, known mechanoreceptors of the lateral line peripheral nervous system. Together, this establishes that noncephalic photoreceptors are more widespread than assumed, and may even reflect more ancient aspects of sensory systems. Our study marks significant advance for the understanding of photoreceptor cell (PRC) evolution and development and for Platynereis as a functional lophotrochozoan model system.

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  1. Kawakami K, Sato S, Ozaki H, Ikeda K (2000) Six family genes-structure and function as transcription factors and their roles in development. Bioessays 22(7):616-626.

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Authors
Backfisch, B., Veedin Rajan, V. B., Fischer, R. M., Lohs, C., Arboleda, E., Tessmar-Raible, K., & Raible, F.
Affiliations
  • California Institute of Technology (US)
  • Max F. Perutz Laboratories, Department of Microbiology, Immunobiology, and Genetics, University of Vienna, A-1030 Vienna, Austria
Corresponding author
Raible, Florian
Venue
Proceedings of the National Academy of Sciences
Published
2012-12-17
Volume
110
Issue
1
Pages
193-198
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2151980532
Cited by
93
References
51
Citations by year
2026: 2 · 2025: 5 · 2024: 5 · 2023: 2 · 2022: 7 · 2021: 8 · 2020: 6 · 2019: 8 · 2018: 5 · 2017: 4 · 2016: 10 · 2015: 6 · 2014: 17 · 2013: 8
FWCI
3.98
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Austrian Science Fund (#AY0041321)
  • Universität Wien
  • Georg-August-Universität Göttingen
  • FP7 Ideas: European Research Council (260304)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
Platynereis dumerilii, photoreceptor evolution, rhabdomeric photoreceptors, notopodia, melanopsin, neuromasts, lateral line, eye evolution
MeSH terms
Animals, Base Sequence, Biological Evolution, Immunohistochemistry, Molecular Sequence Data, Polychaeta, Zebrafish, In Situ Hybridization, Sequence Analysis, DNA, DNA Primers, Photoreceptor Cells, Invertebrate, Gene Transfer Techniques, Microscopy, Confocal, Gene Expression Profiling, Animals, Genetically Modified, Green Fluorescent Proteins, Opsins

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