@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 {6901, title = {Immunohistochemical Approach to Understanding the Organization of the Olfactory System in the Cuttlefish, Sepia officinalis}, journal = {ACS Chemical Neuroscience}, volume = {9}, year = {2018}, month = {Mar-08-2019}, pages = {2074 - 2088}, issn = {1948-7193}, doi = {10.1021/acschemneuro.8b00021}, url = {https://pubs.acs.org/doi/10.1021/acschemneuro.8b00021}, author = {Scaros, Alexia T. and Croll, Roger P. and S{\'e}bastien Baratte} } @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 {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 {3265, title = {Emergence of sensory structures in the developing epidermis in sepia officinalis and other coleoid cephalopods.}, journal = {J Comp Neurol}, volume = {522}, year = {2014}, month = {2014 Sep 1}, pages = {3004-19}, abstract = {

Embryonic cuttlefish can first respond to a variety of sensory stimuli during early development in the egg capsule. To examine the neural basis of this ability, we investigated the emergence of sensory structures within the developing epidermis. We show that the skin facing the outer environment (not the skin lining the mantle cavity, for example) is derived from embryonic domains expressing the Sepia officinalis ortholog of pax3/7, a gene involved in epidermis specification in vertebrates. On the head, they are confined to discrete brachial regions referred to as "arm pillars" that expand and cover Sof-pax3/7-negative head ectodermal tissues. As revealed by the expression of the S. officinalis ortholog of elav1, an early marker of neural differentiation, the olfactory organs first differentiate at about stage 16 within Sof-pax3/7-negative ectodermal regions before they are covered by the definitive Sof-pax3/7-positive outer epithelium. In contrast, the eight mechanosensory lateral lines running over the head surface and the numerous other putative sensory cells in the epidermis, differentiate in the Sof-pax3/7-positive tissues at stages \~{}24-25, after they have extended over the entire outer surfaces of the head and arms. Locations and morphologies of the various sensory cells in the olfactory organs and skin were examined using antibodies against acetylated tubulin during the development of S. officinalis and were compared with those in hatchlings of two other cephalopod species. The early differentiation of olfactory structures and the peculiar development of the epidermis with its sensory cells provide new perspectives for comparisons of developmental processes among molluscs.

}, issn = {1096-9861}, doi = {10.1002/cne.23562}, author = {Buresi, Auxane and Croll, Roger P and Tiozzo, Stefano 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} }