@article {8728, title = {Exploration of chemosensory ionotropic receptors in cephalopods: the IR25 gene is expressed in the olfactory organs, suckers, and fins of Sepia officinalis.}, journal = {Chem Senses}, volume = {46}, year = {2021}, month = {2021 01 01}, abstract = {

While they are mostly renowned for their visual capacities, cephalopods are also good at olfaction for prey, predator, and conspecific detection. The olfactory organs and olfactory cells are well described but olfactory receptors-genes and proteins-are still undescribed in cephalopods. We conducted a broad phylogenetic analysis of the ionotropic glutamate receptor family in mollusks (iGluR), especially to identify IR members (Ionotropic Receptors), a variant subfamily whose involvement in chemosensory functions has been shown in most studied protostomes. A total of 312 iGluRs sequences (including 111 IRs) from gastropods, bivalves, and cephalopods were identified and annotated. One orthologue of the gene coding for the chemosensory IR25 co-receptor has been found in Sepia officinalis (Soff-IR25). We searched for Soff-IR25 expression at the cellular level by in situ hybridization in whole embryos at late stages before hatching. Expression was observed in the olfactory organs, which strongly validates the chemosensory function of this receptor in cephalopods. Soff-IR25 was also detected in the developing suckers, which suggests that the unique {\guillemotleft} taste by touch {\guillemotright} behavior that cephalopods execute with their arms and suckers share features with olfaction. Finally, Soff-IR25 positive cells were unexpectedly found in fins, the two posterior appendages of cephalopods, mostly involved in locomotory functions. This result opens new avenues of investigation to confirm fins as additional chemosensory organs in cephalopods.

}, keywords = {Animals, Cephalopoda, Phylogeny, Receptors, Ionotropic Glutamate, Receptors, Odorant, Sepia, Smell}, issn = {1464-3553}, doi = {10.1093/chemse/bjab047}, author = {Aude Andouche and Valera, St{\'e}phane and S{\'e}bastien Baratte} } @article {6900, title = {Histamine and histidine decarboxylase in the olfactory system and brain of the common cuttlefish Sepia officinalis (Linnaeus, 1758)}, journal = {Journal of Comparative Neurology}, volume = {528}, year = {2020}, month = {Feb-05-2020}, pages = {1095 - 1112}, issn = {0021-9967}, doi = {10.1002/cne.v528.710.1002/cne.24809}, url = {https://onlinelibrary.wiley.com/toc/10969861/528/7}, author = {Scaros, Alexia T. and Aude Andouche and S{\'e}bastien Baratte and Croll, Roger P.} } @article {5103, title = {Eye Development in Sepia officinalis Embryo: What the Uncommon Gene Expression Profiles Tell Us about Eye Evolution}, journal = {Front. Physiol.}, year = {2017}, month = {08/2017}, abstract = {

In metazoans, there is a remarkable diversity of photosensitive structures; their shapes, physiology, optical properties, and development are different. To approach the evolution of photosensitive structures and visual function, cephalopods are particularly interesting organisms due to their most highly centralized nervous system and their camerular eyes which constitute a convergence with those of vertebrates. The eye morphogenesis in numerous metazoans is controlled mainly by a conserved Retinal Determination Gene Network (RDGN) including pax, six, eya, and dac playing also key developmental roles in non-retinal structures and tissues of vertebrates and Drosophila. Here we have identified and explored the role of Sof-dac, Sof-six1/2, Sof-eya in eye morphogenesis, and nervous structures controlling the visual function in Sepia officinalis. We compare that with the already shown expressions in eye development of Sof-otx and Sof-pax genes. Rhodopsin is the pigment responsible for light sensitivity in metazoan, which correlate to correlate visual function and eye development. We studied Sof-rhodopsin expression during retina differentiation. By in situ hybridization, we show that (1) all of the RDGN genes, including Sof-pax6, are expressed in the eye area during the early developmental stages but they are not expressed in the retina, unlike Sof-otx, which could have a role in retina differentiation; (2) Sof-rhodopsin is expressed in the retina just before vision gets functional, from stage 23 to hatching. Our results evidence a role of Sof-six1/2, Sof-eya, and Sof-dac in eye development. However, the gene network involved in the retinal photoreceptor differentiation remains to be determined. Moreover, for the first time, Sof-rhodopsin expression is shown in the embryonic retina of cuttlefish suggesting the evolutionary conservation of the role of rhodopsin in visual phototransduction within metazoans. These findings are correlated with the physiological and behavioral observations suggesting that S. officinalis is able to react to light stimuli from stage 25 of organogenesis on, as soon as the first retinal pigments appear.

}, keywords = {dac, eya, eye development, rhodopsin, Sepia officinalis, six}, doi = {10.3389/fphys.2017.00613}, author = {Imarazen, Boudjema and Aude Andouche and Yann Bassaglia and Pascal Jean Lopez and Laure Bonnaud-Ponticelli} } @article {6902, title = {The Pax gene family: Highlights from cephalopods}, journal = {PLOS ONE}, volume = {12}, year = {2017}, month = {Feb-03-2017}, pages = {e0172719}, doi = {10.1371/journal.pone.017271910.1371}, url = {https://dx.plos.org/10.1371/journal.pone.0172719}, author = {Navet, Sandra and Buresi, Auxane and S{\'e}bastien Baratte and Aude Andouche and Laure Bonnaud-Ponticelli and Yann Bassaglia}, editor = {Schubert, Michael} } @article {4494, title = {Coleoid cephalopod color patterns: Adult skin structures and their emergence during development in sepia officinalis}, journal = {Vie et Milieu}, volume = {66}, year = {2016}, month = {May 2016}, pages = {43-55}, abstract = {

The skin of coleo{\"\i}d cephalopods is a complex tissue that allows the rapid display of numerous changing or static patterns for communication and camouflage. Chromatophores, iridophores, and leucophores are responsible for these properties. Chromatophores are pigmentary neuromuscular organs, directly controlled by the brain. Iridophores are iridescent cells that use platelets of proteins that are arranged into repetitive structures (iridosomes) to produce iridescence; and leucophores are perfect reflectors. The same family of protein (reflectins), initially characterized in iridophores, have been detected (at different levels) in the three structures. Here we review the current knowledge of adult skin and its nervous control and describe the establishment of chromatophores and iridophores during embryonic development in Sepia officinalis.

}, keywords = {Cephalopods, Chromatophores, color pattern, Development, iridophores}, author = {Aude Andouche and Yann Bassaglia} } @article {4493, title = {A developmental table of embryogenesis in Sepia officinalis}, journal = {Vie et Milieu}, volume = {66}, year = {2016}, month = {May 2016}, pages = {11-23}, abstract = {

The development of several cephalopods among them Sepia officinalis (Linnaeus, 1758) has been very carefully described by Naef in the early 20th century. Here an illustrated developmental table of Sepia officinalis is proposed with a morphological description of each stage. The 30 stages are grouped into five steps of development: cleavage (stages 1 to 9), gastrulation (stages 10 to 13), organogenesis, plane phase (stages 14 to 18), organogenesis, extension phase (stages 19 to 22) and organogenesis, growth phase (stages 23 to 30), when the embryo has acquired the general adult conformation. For each stage, morphological identification criteria are proposed in order that this table is used as a lab tool for cephalopod researchers interested in development.

}, keywords = {Cephalopoda, Development, Embryology, Sepia officinalis}, issn = {02408759}, author = {Boletzky, S.V and Aude Andouche and Laure Bonnaud-Ponticelli} } @article {4491, title = {Nervous system development in cephalopods: How egg yolk-richness modifies the topology of the mediolateral patterning system.}, journal = {Dev Biol}, volume = {415}, year = {2016}, month = {2016 Jul 1}, pages = {143-56}, abstract = {

Cephalopods possess the most complex centralized nervous system among molluscs and the molecular determinants of its development have only begun to be explored. To better understand how evolved their brain and body axes, we studied Sepia officinalis embryos and investigated the expression patterns of neural regionalization genes involved in the mediolateral patterning of the neuroectoderm in model species. SoxB1 expression reveals that the embryonic neuroectoderm is made of several distinct territories that constitute a large part of the animal pole disc. Concentric nkx2.1, pax6/gsx, and pax3/7/msx/pax2/5/8 positive domains subdivide this neuroectoderm. Looking from dorsal to ventral sides, the sequence of these expressions is reminiscent of the mediolateral subdivision in model species, which provides good evidence for "mediolateral patterning" conservation in cephalopods. A specific feature of cephalopod development, however, includes an unconventional orientation to this mediolateral sequence: median markers (like nkx2.1) are unexpectedly expressed at the periphery of the cuttlefish embryo and lateral markers (like Pax3/7) are expressed centrally. As the egg is rich with yolk, the lips of the blastopore (that classically organizes the neural midline) remain unclosed at the lateral side of the animal pole until late stages of organogenesis, therefore reversing the whole embryo topology. These findings confirm - by means of molecular tools - the location of both ventral and dorsal poles in cephalopod embryos.

}, issn = {1095-564X}, doi = {10.1016/j.ydbio.2016.04.027}, author = {Buresi, Auxane and Aude Andouche and Navet, S and Yann Bassaglia and Laure Bonnaud-Ponticelli and S{\'e}bastien Baratte} } @article {3392, title = {NEUROGENESIS IN CEPHALOPODS: {\textquotedblleft}ECO-EVO-DEVO{\textquotedblright} APPROACH IN THE CUTTLEFISH SEPIA OFFICINALIS (MOLLUSCA-CEPHALOPODA)}, journal = {Journal of Marine Science and Technology, Taiwan}, volume = {22}, year = {2014}, pages = {15-24}, abstract = {

Cephalopods are new evolutionary and ecological models.
By their phylogenetic position (Lophotrochozoa, Mollusca),
they provide a missing master piece in the whole puzzle of
neurodevelopment studies. Their derived and specific nervous
system but also their convergence with vertebrates offer
abundant materials to question the evolution and development
of the nervous system of Metazoa (evo-devo studies). In
addition, their various adaptions to different modes of life
open new fields of investigation of developmental plasticity
according to ecological context (eco-evo-devo approach). In
this paper, we review the recent works on cephalopod nervous
developmental investigations. We show how cephalopods, and
especially Sepia officinalis, an animal of economical interest,
can be used as suitable models to extend our knowledge on
cephalopod ecology and on nervous system evolution among
molluscs.

}, author = {Navet, S and S{\'e}bastien Baratte and Yann Bassaglia and Aude Andouche and Buresi, Auxane and Laure Bonnaud-Ponticelli} }