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| Title |
Physiological impact of temperature increase on ice krill (Euphausia crystallorophias): HSP70 response. SEB : Salzburg 29/05-02/07/2012 |
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Conference - International - Poster |
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2012 |
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yes |
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4298 |
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Conference - National - Poster |
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2012 |
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yes |
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4299 |
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| Author |
Kevin Cascella, Erwan Corre, Rob King, Kim Huenerlage , Friedrich Buchholz , So Kawagushi, Jean-Yves Toullec
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| Title |
Physiological response of polar krill to an increase of temperature: HSP70 expressions. Colloque d'Ecophysiologie Animale 2013. Lyon |
Type |
Conference - International - Communication |
| Year |
2013 |
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yes |
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4568 |
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| Title |
Transcriptome and Peptidome Characterisation of the Main Neuropeptides and Peptidic Hormones of a Euphausiid: The Ice Krill, Euphausia crystallorophias |
Type |
Book Chapter |
| Year |
2013 |
Publication |
PLOS ONE |
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| Volume |
8 |
Issue |
8 |
Pages |
e71609 |
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| Abstract |
Background: The Ice krill, Euphausia crystallorophias is one of the species at the base of the Southern Ocean food chain. Given their significant contribution to the biomass of the Southern Ocean, it is vitally important to gain a better understanding of their physiology and, in particular, anticipate their responses to climate change effects in the warming seas around Antarctica. Methodology/Principal Findings: Illumina sequencing was used to produce a transcriptome of the ice krill. Analysis of the assembled contigs via two different methods, produced 36 new pre-pro-peptides, coding for 61 neuropeptides or peptide hormones belonging to the following families: Allatostatins (A, B et C), Bursicon (α and β), Crustacean Hyperglycemic Hormones (CHH and MIH/VIHs), Crustacean Cardioactive Peptide (CCAP), Corazonin, Diuretic Hormones (DH), the Eclosion Hormone (EH), Neuroparsin, Neuropeptide F (NPF), small Neuropeptide F (sNPF), Pigment Dispersing Hormone (PDH), Red Pigment Concentrating Hormone (RPCH) and finally Tachykinin. LC/MS/MS proteomics was also carried out on eyestalk extracts, which are the major site of neuropeptide synthesis in decapod crustaceans. Results confirmed the presence of six neuropeptides and six precursor-related peptides previously identified in the transcriptome analyses.Conclusions: This study represents the first comprehensive analysis of neuropeptide hormones in a Eucarida non-decapod Malacostraca, several of which are described for the first time in a non-decapod crustacean. Additionally, there is a potential expansion of PDH and Neuropeptide F family members, which may reflect certain life history traits such as circadian rhythms associated with diurnal migrations and also the confirmation via mass spectrometry of several novel pre-pro-peptides, of unknown function. Knowledge of these essential hormones provides a vital framework for understanding the physiological response of this key Southern Ocean species to climate change and provides a valuable resource for studies into the molecular phylogeny of these organisms and the evolution of neuropeptide hormones. |
| Programme |
1039 |
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Thesis |
Bachelor's thesis |
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1932-6203 |
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yes |
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4503 |
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| Author |
Jean-Yves Toullec |
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Type |
Report |
| Year |
2013 |
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1039 |
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yes |
| Call Number |
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Serial |
4581 |
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| Title |
Antarctic krill (Euphausia superba) in a warming ocean: thermotolerance and deciphering Hsp70 responses |
Type |
Journal |
| Year |
2020 |
Publication |
Cell Stress and Chaperones |
Abbreviated Journal |
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| Volume |
25 |
Issue |
3 |
Pages |
519-531 |
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1039 |
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Edition |
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| ISSN |
1466-1268 |
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Approved |
yes |
| Call Number |
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Serial |
8173 |
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Characterization of the neuropeptidome of a Southern Ocean decapod, the Antarctic shrimp Chorismus antarcticus: Focusing on a new decapod ITP-like peptide belonging to the CHH peptide family |
Type |
Journal |
| Year |
2017 |
Publication |
General and Comparative Endocrinology |
Abbreviated Journal |
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| Volume |
252 |
Issue |
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Pages |
60-78 |
| Keywords |
Antarctica CHH Crustacea ITP-like Neuropeptides Transcriptomics |
| Abstract |
As part of the study of the resilience of Antarctic crustaceans to global warming, the shrimp Chorismus antarcticus was subjected to an analysis of global approach using the Next Generation Sequencing Illumina Hi-Seq platform. With this data a detailed study into the principal neuropeptides and neurohormones of this species have been undertaken. Total RNAs from whole animals were enriched with eyestalk extracts to ensure maximum sequencing depth of the different neurohormones and neuropeptides mainly expressed into the X organ-sinus gland complex, which is a major endocrine organ of their synthesis. Apart from the information that can provide the availability of the transcriptome of a polar crustacean, the study of neuropeptides of a caridean shrimp will partially fill the limited data available for this taxon. Illumina sequencing was used to produce a transcriptome of the polar shrimp. Analysis of the Trinity assembled contigs produced 55 pre-pro-peptides, coding for 111 neuropeptides belonging to the following families: adipokinetic-corazonin-like peptide, Allatostatins (A, B et C), Bursicon (?), CCHamide, Crustacean Hyperglycemic Hormones (CHH), Crustacean Cardioactive Peptide (CCAP), Corazonin, Crustacean Female Sex Hormone (CSFH), Diuretic Hormones 31 and 45 (DH), Eclosion Hormone (EH), FLRFamide, GSEFLamide, Intocin, Ion Transport Peptide-like (ITP-like), Leucokinin, Molt-inhibiting Hormone, Myosuppresin, Neuroparsin, Neuropeptide F (NPF), Orcokinin, Orcomyotropin, Pigment Dispersing Hormone (PDH), Pyrokinin, Red Pigment Concentrating Hormone (RPCH), SIFamide, small Neuropeptide F (sNPF), Sulfakinin and finally Tachykinin Related peptides. Among the new peptides highlighted in this study, the focus was placed on the peptides of the CHH family and more particularly on a new ITP-like in order to confirm its belonging to a new group of peptides of the family. A phylogeny made from more than 200 sequences of peptides, included new sequences from new species besides Chorismus antarcticus, confirms the peculiarity of this new set of peptides gathered under the name ITP-like. |
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1039 |
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0016-6480 |
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Approved |
yes |
| Call Number |
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Serial |
8174 |
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| Title |
Divergent ecological histories of two sister Antarctic krill species led to contrasted patterns of genetic diversity in their heat-shock protein (hsp70) arsenal |
Type |
Journal |
| Year |
2016 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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| Volume |
6 |
Issue |
5 |
Pages |
1555-1575 |
| Keywords |
Balancing selection duplication heat-shock proteins krill sweep thermal adaptation |
| Abstract |
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1039 |
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2045-7758 |
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Approved |
yes |
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Serial |
8175 |
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| Title |
Responses of the arcto-boreal krill species Thysanoessa inermis to variations in water temperature: coupling Hsp70 isoform expressions with metabolism |
Type |
Journal |
| Year |
2016 |
Publication |
Cell Stress and Chaperones |
Abbreviated Journal |
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| Volume |
21 |
Issue |
6 |
Pages |
969-981 |
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1039 |
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| ISSN |
1466-1268 |
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Approved |
yes |
| Call Number |
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Serial |
8176 |
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| Title |
Diversification, Evolution and Sub-Functionalization of 70kDa Heat-Shock Proteins in Two Sister Species of Antarctic Krill: Differences in Thermal Habitats, Responses and Implications under Climate Change |
Type |
Journal |
| Year |
2015 |
Publication |
PLOS ONE |
Abbreviated Journal |
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| Volume |
10 |
Issue |
4 |
Pages |
e0121642 |
| Keywords |
Antarctica Mitochondria Ocean temperature Phylogenetic analysis Sea ice Sequence motif analysis Speciation Transcriptome analysis |
| Abstract |
Background A comparative thermal tolerance study was undertaken on two sister species of Euphausiids (Antarctic krills) Euphausia superba and Euphausia crystallorophias. Both are essential components of the Southern Ocean ecosystem, but occupy distinct environmental geographical locations with slightly different temperature regimes. They therefore provide a useful model system for the investigation of adaptations to thermal tolerance. Methodology/Principal Finding Initial CTmax studies showed that E. superba was slightly more thermotolerant than E. crystallorophias. Five Hsp70 mRNAs were characterized from the RNAseq data of both species and subsequent expression kinetics studies revealed notable differences in induction of each of the 5 orthologues between the two species, with E. crystallorophias reacting more rapidly than E. superba. Furthermore, analyses conducted to estimate the evolutionary rates and selection strengths acting on each gene tended to support the hypothesis that diversifying selection has contributed to the diversification of this gene family, and led to the selective relaxation on the inducible C form with its possible loss of function in the two krill species. Conclusions The sensitivity of the epipelagic species E. crystallorophias to temperature variations and/or its adaptation to cold is enhanced when compared with its sister species, E. superba. These results indicate that ice krill could be the first of the two species to be impacted by the warming of coastal waters of the Austral ocean in the coming years due to climate change. |
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1932-6203 |
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Approved |
yes |
| Call Number |
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Serial |
8177 |
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