18 results on '"Godefroy, Nelly"'
Search Results
2. Molecular complexity and gene expression controlling cell turnover during a digestive cycle of carnivorous sponge Lycopodina hypogea
- Author
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Le Goff, Emilie, Martinand-Mari, Camille, Belkhir, Khalid, Vacelet, Jean, Nidelet, Sabine, Godefroy, Nelly, and Baghdiguian, Stephen
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- 2022
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3. A comparative ultrastructure study of the tardigrade Ramazzottius varieornatus in the hydrated state, after desiccation and during the process of rehydration.
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Galas, Simon, Le Goff, Emilie, Cazevieille, Chantal, Tanaka, Akihiro, Cuq, Pierre, Baghdiguian, Stephen, Kunieda, Takekazu, Godefroy, Nelly, and Richaud, Myriam
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CELL analysis ,COMPARATIVE studies ,TARDIGRADA ,GENOMES ,TRANSCRIPTOMES - Abstract
Tardigrades can survive hostile environments such as desiccation by adopting a state of anhydrobiosis. Numerous tardigrade species have been described thus far, and recent genome and transcriptome analyses revealed that several distinct strategies were employed to cope with harsh environments depending on the evolutionary lineages. Detailed analyses at the cellular and subcellular levels are essential to complete these data. In this work, we analyzed a tardigrade species that can withstand rapid dehydration, Ramazzottius varieornatus. Surprisingly, we noted an absence of the anhydrobiotic-specific extracellular structure previously described for the Hypsibius exemplaris species. Both Ramazzottius varieornatus and Hypsibius exemplaris belong to the same evolutionary class of Eutardigrada. Nevertheless, our observations reveal discrepancies in the anhydrobiotic structures correlated with the variation in the anhydrobiotic mechanisms. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Sponge digestive system diversity and evolution: filter feeding to carnivory
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Godefroy, Nelly, Le Goff, Emilie, Martinand-Mari, Camille, Belkhir, Khalid, Vacelet, Jean, and Baghdiguian, Stephen
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- 2019
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5. Ultrastructural analysis of the dehydrated tardigrade Hypsibius exemplaris unveils an anhydrobiotic-specific architecture
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Richaud, Myriam, Le Goff, Emilie, Cazevielle, Chantal, Ono, Fumihisa, Mori, Yoshihisa, Saini, Naurang L., Cuq, Pierre, Baghdiguian, Stephen, Godefroy, Nelly, and Galas, Simon
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- 2020
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6. Using the Carnivorous Sponge Lycopodina hypogea as a Nonclassical Model for Understanding Apoptosis-Mediated Shape Homeostasis at the Organism Level.
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Baghdiguian, Stephen, Le Goff, Emilie, Paradis, Laure, Vacelet, Jean, and Godefroy, Nelly
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CARNIVOROUS animals ,APOPTOSIS ,FIBERS ,MORPHOGENESIS ,SPONGES (Invertebrates) - Abstract
The dynamic equilibrium between death and regeneration is well established at the cell level. Conversely, no study has investigated the homeostatic control of shape at the whole organism level through processes involving apoptosis. To address this fundamental biological question, we took advantage of the morphological and functional properties of the carnivorous sponge Lycopodina hypogea. During its feeding cycle, this sponge undergoes spectacular shape changes. Starved animals display many elongated filaments to capture prey. After capture, prey are digested in the absence of any centralized digestive structure. Strikingly, the elongated filaments actively regress and reform to maintain a constant, homeostatically controlled number and size of filaments in resting sponges. This unusual mode of nutrition provides a unique opportunity to better understand the processes involved in cell renewal and regeneration in adult tissues. Throughout these processes, cell proliferation and apoptosis are interconnected key actors. Therefore, L. hypogea is an ideal organism to study how molecular and cellular processes are mechanistically coupled to ensure global shape homeostasis. [ABSTRACT FROM AUTHOR]
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- 2023
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7. FGF1 inhibits p53-dependent apoptosis and cell cycle arrest via an intracrine pathway
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Bouleau, Sylvina, Grimal, Hélène, Rincheval, Vincent, Godefroy, Nelly, Mignotte, Bernard, Vayssière, Jean-Luc, and Renaud, Flore
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- 2005
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8. Caspase-9 can antagonize p53-induced apoptosis by generating a p76Rb truncated form of Rb
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Lemaire, Christophe, Godefroy, Nelly, Costina-Parvu, Ioana, Rincheval, Vincent, Renaud, Flore, Trotot, Pascale, Bouleau, Sylvina, Mignotte, Bernard, and Vayssière, Jean-Luc
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- 2005
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9. Transcriptional repression by p53 promotes a Bcl-2-insensitive and mitochondria-independent pathway of apoptosis
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Godefroy, Nelly, Bouleau, Sylvina, Gruel, Gaëtan, Renaud, Flore, Rincheval, Vincent, Mignotte, Bernard, Tronik-Le Roux, Diana, and Vayssière, Jean-Luc
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- 2004
10. The Non-Proliferative Nature of Ascidian Folliculogenesis as a Model of Highly Ordered Cellular Topology Distinct from Proliferative Epithelia.
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Azzag, Karim, Chelin, Yoann, Rousset, François, Le Goff, Emilie, Martinand-Mari, Camille, Martinez, Anne-Marie, Maurin, Bernard, Daujat-Chavanieu, Martine, Godefroy, Nelly, Averseng, Julien, Mangeat, Paul, and Baghdiguian, Stephen
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SEA squirt physiology ,OVARIAN follicle ,TOPOLOGY ,EPITHELIAL cells ,DROSOPHILA melanogaster ,GENETIC mutation ,PHYSIOLOGY - Abstract
Previous studies have addressed why and how mono‐stratified epithelia adopt a polygonal topology. One major additional, and yet unanswered question is how the frequency of different cell shapes is achieved and whether the same distribution applies between non-proliferative and proliferative epithelia. We compared different proliferative and non-proliferative epithelia from a range of organisms as well as Drosophila melanogaster mutants, deficient for apoptosis or hyperproliferative. We show that the distribution of cell shapes in non‐proliferative epithelia (follicular cells of five species of tunicates) is distinctly, and more stringently organized than proliferative ones (cultured epithelial cells and Drosophila melanogaster imaginal discs). The discrepancy is not supported by geometrical constraints (spherical versus flat monolayers), number of cells, or apoptosis events. We have developed a theoretical model of epithelial morphogenesis, based on the physics of divided media, that takes into account biological parameters such as cell‐cell contact adhesions and tensions, cell and tissue growth, and which reproduces the effects of proliferation by increasing the topological heterogeneity observed experimentally. We therefore present a model for the morphogenesis of epithelia where, in a proliferative context, an extended distribution of cell shapes (range of 4 to 10 neighbors per cell) contrasts with the narrower range of 5-7 neighbors per cell that characterizes non proliferative epithelia. [ABSTRACT FROM AUTHOR]
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- 2015
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11. Expression and Activation of Caspase-6 in Human Fetal and Adult Tissues.
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Godefroy, Nelly, Foveau, Bénédicte, Albrecht, Steffen, Goodyer, Cynthia G., and LeBlanc, Andréa C.
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GENE expression , *CASPASE genetics , *FETAL tissues , *ALZHEIMER'S disease , *PRESERVATION of organs, tissues, etc. , *CRYOBIOLOGY , *TISSUE banks - Abstract
Caspase-6 is an effector caspase that has not been investigated thoroughly despite the fact that Caspase-6 is strongly activated in Alzheimer disease brains. To understand the full physiological impact of Caspase-6 in humans, we investigated Caspase-6 expression. We performed western blot analyses to detect the pro-Caspase-6 and its active p20 subunit in fetal and adult lung, kidney, brain, spleen, muscle, stomach, colon, heart, liver, skin, and adrenals tissues. The levels were semi-quantitated by densitometry. The results show a ubiquitous expression of Caspase-6 in most fetal tissues with the lowest levels in the brain and the highest levels in the gastrointestinal system. Caspase-6 active p20 subunits were only detected in fetal stomach. Immunohistochemical analysis of a human fetal embryo showed active Caspase-6 positive apoptotic cells in the dorsal root ganglion, liver, lung, kidney, ovary, skeletal muscle and the intestine. In the adult tissues, the levels of Caspase-6 were lower than in fetal tissues but remained high in the colon, stomach, lung, kidney and liver. Immunohistological analyses revealed that active Caspase-6 was abundant in goblet cells and epithelial cells sloughing off the intestinal lining of the adult colon. These results suggest that Caspase-6 is likely important in most tissues during early development but is less involved in adult tissues. The low levels of Caspase-6 in fetal and adult brain indicate that increased expression as observed in Alzheimer Disease is a pathological condition. Lastly, the high levels of Caspase-6 in the gastrointestinal system indicate a potential specific function of Caspase-6 in these tissues. [ABSTRACT FROM AUTHOR]
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- 2013
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12. Caspase-9 can antagonize p53-induced apoptosis by generating a p76Rb truncated form of Rb.
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Lemaire, Christophe, Godefroy, Nelly, Costina-Parvu, Ioana, Rincheval, Vincent, Renaud, Flore, Trotot, Pascale, Bouleau, Sylvina, Mignotte, Bernard, and Vayssière, Jean-Luc
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TUMOR suppressor proteins , *RETINOBLASTOMA , *P53 protein , *APOPTOSIS , *NEUROBLASTOMA , *RETINA cancer - Abstract
The tumor suppressor Rb (retinoblastoma protein) is known to regulate p53-dependent apoptosis, but the mechanisms involved are unclear. In a rat fibroblast model, we previously observed that caspase inhibition potentiates p53-dependent apoptosis and prevents the Rb cleavage associated with p53 activation. These results suggested that a caspase(s) can antagonize p53-mediated apoptosis via the production of a protective Rb truncated form. Here, we identify caspase-9 as the caspase that interferes, upstream of the mitochondrion, with p53-induced apoptosis in both immortalized and primary fibroblasts. This caspase can be detected as a p38 processed form in living cells, in the absence of apoptosome formation and apoptotic signal. We also provide evidence that the involvement of caspase-9 in a pre-mitochondrial protective pathway results from the previously undescribed cleavage of Rb, at a LExD site, into a p76Rb form, which antagonizes p53-induced apoptosis. These results establish that a truncated form of Rb can display an antiapoptotic activity, rather than just being a by-product of Rb degradation.Oncogene (2005) 24, 3297-3308. doi:10.1038/sj.onc.1208493 Published online 21 February 2005 [ABSTRACT FROM AUTHOR]
- Published
- 2005
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13. Diurnal changes in ammonia assimilation in transformed tobacco plants expressing ferredoxin-dependent glutamate synthase mRNA in the antisense orientation
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Ferrario-Méry, Sylvie, Valadier, Marie-Hélène, Godefroy, Nelly, Miallier, Delphine, Hirel, Bertrand, Foyer, Christine H., and Suzuki, Akira
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TRANSGENIC plants , *AMMONIA , *AMINOTRANSFERASES - Abstract
The diurnal changes in carbon and nitrogen metabolite concentrations were studied in transgenic tobacco plants (Nicotiana tabacum L. cv. Xanthi) expressing an antisense ferredoxin-dependent glutamate synthase (Fd-GOGAT; EC 1.4.7.1) mRNA. In parallel, enzyme activities, and abundance of the proteins and transcripts involved in ammonia assimilation were monitored during the day/night cycle in both transgenic and untransformed control plants. When the transgenic plants were transferred from non-photorespiratory (high CO2) to photorespiratory conditions (air), photorespiratory NH4+ accumulated in the leaves during the second half of the light period; it decreased progressively through the night until the beginning of the next light period. Glutamine and 2-oxoglutarate (2-OG) also accumulated during the second part of the light period; this was followed by a decrease at the end of the night. A concomitant increase in asparagine was observed during the night, suggesting that this amino acid serves as a temporary storage compound for the partial elimination of excess photorespiratory ammonia. We also observed that the direction of the glutamate reaction varied during the day/night cycle such that a higher ratio of aminating/deaminating activity occurred in the first half of the light period. This was correlated with the decline in NH4+ and 2-OG concentrations. Both of these observations suggest that alternative metabolic pathways may be transiently activated during a day/night cycle in plants with low Fd-GOGAT activity. [Copyright &y& Elsevier]
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- 2002
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14. Bcl-2 can promote p53-dependent senescence versus apoptosis without affecting the G1/S transition
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Rincheval, Vincent, Renaud, Flore, Lemaire, Christophe, Godefroy, Nelly, Trotot, Pascale, Boulo, Viviane, Mignotte, Bernard, and Vayssière, Jean-Luc
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APOPTOSIS , *CELL cycle , *GROWTH factors - Abstract
With the aim to identify events involved in the determination of p53-dependent apoptosis versus growth arrest, we used rat embryo fibroblasts expressing a temperature-sensitive mutant (tsA58) of the SV40 large tumour antigen (LT). Heat-inactivation of LT leads to p53 activation and commitment to a senescent-like state (REtsA15 cell line) or apoptosis (REtsAF cell line). We report that senescence is associated with high levels of the anti-apoptotic Bcl-2 protein and a cell cycle arrest in G1 phase, whereas apoptosis is associated with low levels of Bcl-2 and a cell cycle arrest in G2 phase. Here we show that Bcl-2, which can inhibit apoptosis and proliferation, turns the apoptotic phenotype into a senescent-like phenotype in G2 phase. This result suggests that Bcl-2-dependent inhibition of apoptosis could be crucial for the commitment to replicative senescence, whereas its ability to inhibit G1 progression would not be required. [Copyright &y& Elsevier]
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- 2002
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15. Staining and Tracking Methods for Studying Sponge Cell Dynamics.
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Borchiellini C, Degnan SM, Le Goff E, Rocher C, Vernale A, Baghdiguian S, Séjourné N, Marschal F, Le Bivic A, Godefroy N, Degnan BM, and Renard E
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- Animals, Cell Tracking methods, Fluorescent Antibody Technique methods, Optical Imaging methods, Porifera cytology, Staining and Labeling methods
- Abstract
To better understand the origin of animal cell types, body plans, and other morphological features, further biological knowledge and understanding are needed from non-bilaterian phyla, namely, Placozoa, Ctenophora, and Porifera. This chapter describes recent cell staining approaches that have been developed in three phylogenetically distinct sponge species-the homoscleromorph Oscarella lobularis, and the demosponges Amphimedon queenslandica and Lycopodina hypogea-to enable analyses of cell death, proliferation, and migration. These methods allow for a more detailed understanding of cellular behaviors and fates, and morphogenetic processes in poriferans, building on current knowledge of sponge cell biology that relies chiefly on classical (static) histological observations.
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- 2021
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16. Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition).
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Klionsky DJ, Abdelmohsen K, Abe A, Abedin MJ, Abeliovich H, Acevedo Arozena A, Adachi H, Adams CM, Adams PD, Adeli K, Adhihetty PJ, Adler SG, Agam G, Agarwal R, Aghi MK, Agnello M, Agostinis P, Aguilar PV, Aguirre-Ghiso J, Airoldi EM, Ait-Si-Ali S, Akematsu T, Akporiaye ET, Al-Rubeai M, Albaiceta GM, Albanese C, Albani D, Albert ML, Aldudo J, Algül H, Alirezaei M, Alloza I, Almasan A, Almonte-Beceril M, Alnemri ES, Alonso C, Altan-Bonnet N, Altieri DC, Alvarez S, Alvarez-Erviti L, Alves S, Amadoro G, Amano A, Amantini C, Ambrosio S, Amelio I, Amer AO, Amessou M, Amon A, An Z, Anania FA, Andersen SU, Andley UP, Andreadi CK, Andrieu-Abadie N, Anel A, Ann DK, Anoopkumar-Dukie S, Antonioli M, Aoki H, Apostolova N, Aquila S, Aquilano K, Araki K, Arama E, Aranda A, Araya J, Arcaro A, Arias E, Arimoto H, Ariosa AR, Armstrong JL, Arnould T, Arsov I, Asanuma K, Askanas V, Asselin E, Atarashi R, Atherton SS, Atkin JD, Attardi LD, Auberger P, Auburger G, Aurelian L, Autelli R, Avagliano L, Avantaggiati ML, Avrahami L, Awale S, Azad N, Bachetti T, Backer JM, Bae DH, Bae JS, Bae ON, Bae SH, Baehrecke EH, Baek SH, Baghdiguian S, Bagniewska-Zadworna A, Bai H, Bai J, Bai XY, Bailly Y, Balaji KN, Balduini W, Ballabio A, Balzan R, Banerjee R, Bánhegyi G, Bao H, Barbeau B, Barrachina MD, Barreiro E, Bartel B, Bartolomé A, Bassham DC, Bassi MT, Bast RC Jr, Basu A, Batista MT, Batoko H, Battino M, Bauckman K, Baumgarner BL, Bayer KU, Beale R, Beaulieu JF, Beck GR Jr, Becker C, Beckham JD, Bédard PA, Bednarski PJ, Begley TJ, Behl C, Behrends C, Behrens GM, Behrns KE, Bejarano E, Belaid A, Belleudi F, Bénard G, Berchem G, Bergamaschi D, Bergami M, Berkhout B, Berliocchi L, Bernard A, Bernard M, Bernassola F, Bertolotti A, Bess AS, Besteiro S, Bettuzzi S, Bhalla S, Bhattacharyya S, Bhutia SK, Biagosch C, Bianchi MW, Biard-Piechaczyk M, Billes V, Bincoletto C, Bingol B, Bird SW, Bitoun M, Bjedov I, Blackstone C, Blanc L, Blanco GA, Blomhoff HK, Boada-Romero E, Böckler S, Boes M, Boesze-Battaglia K, Boise LH, Bolino A, Boman A, Bonaldo P, Bordi M, Bosch J, Botana LM, Botti J, Bou G, Bouché M, Bouchecareilh M, Boucher MJ, Boulton ME, Bouret SG, Boya P, Boyer-Guittaut M, Bozhkov PV, Brady N, Braga VM, Brancolini C, Braus GH, Bravo-San Pedro JM, Brennan LA, Bresnick EH, Brest P, Bridges D, Bringer MA, Brini M, Brito GC, Brodin B, Brookes PS, Brown EJ, Brown K, Broxmeyer HE, Bruhat A, Brum PC, Brumell JH, Brunetti-Pierri N, Bryson-Richardson RJ, Buch S, Buchan AM, Budak H, Bulavin DV, Bultman SJ, Bultynck G, Bumbasirevic V, Burelle Y, Burke RE, Burmeister M, Bütikofer P, Caberlotto L, Cadwell K, Cahova M, Cai D, Cai J, Cai Q, Calatayud S, Camougrand N, Campanella M, Campbell GR, Campbell M, Campello S, Candau R, Caniggia I, Cantoni L, Cao L, Caplan AB, Caraglia M, Cardinali C, Cardoso SM, Carew JS, Carleton LA, Carlin CR, Carloni S, Carlsson SR, Carmona-Gutierrez D, Carneiro LA, Carnevali O, Carra S, Carrier A, Carroll B, Casas C, Casas J, Cassinelli G, Castets P, Castro-Obregon S, Cavallini G, Ceccherini I, Cecconi F, Cederbaum AI, Ceña V, Cenci S, Cerella C, Cervia D, Cetrullo S, Chaachouay H, Chae HJ, Chagin AS, Chai CY, Chakrabarti G, Chamilos G, Chan EY, Chan MT, Chandra D, Chandra P, Chang CP, Chang RC, Chang TY, Chatham JC, Chatterjee S, Chauhan S, Che Y, Cheetham ME, Cheluvappa R, Chen CJ, Chen G, Chen GC, Chen G, Chen H, Chen JW, Chen JK, Chen M, Chen M, Chen P, Chen Q, Chen Q, Chen SD, Chen S, Chen SS, Chen W, Chen WJ, Chen WQ, Chen W, Chen X, Chen YH, Chen YG, Chen Y, Chen Y, Chen Y, Chen YJ, Chen YQ, Chen Y, Chen Z, Chen Z, Cheng A, Cheng CH, Cheng H, Cheong H, Cherry S, Chesney J, Cheung CH, Chevet E, Chi HC, Chi SG, Chiacchiera F, Chiang HL, Chiarelli R, Chiariello M, Chieppa M, Chin LS, Chiong M, Chiu GN, Cho DH, Cho SG, Cho WC, Cho YY, Cho YS, Choi AM, Choi EJ, Choi EK, Choi J, Choi ME, Choi SI, Chou TF, Chouaib S, Choubey D, Choubey V, Chow KC, Chowdhury K, Chu CT, Chuang TH, Chun T, Chung H, Chung T, Chung YL, Chwae YJ, Cianfanelli V, Ciarcia R, Ciechomska IA, Ciriolo MR, Cirone M, Claerhout S, Clague MJ, Clària J, Clarke PG, Clarke R, Clementi E, Cleyrat C, Cnop M, Coccia EM, Cocco T, Codogno P, Coers J, Cohen EE, Colecchia D, Coletto L, Coll NS, Colucci-Guyon E, Comincini S, Condello M, Cook KL, Coombs GH, Cooper CD, Cooper JM, Coppens I, Corasaniti MT, Corazzari M, Corbalan R, Corcelle-Termeau E, Cordero MD, Corral-Ramos C, Corti O, Cossarizza A, Costelli P, Costes S, Cotman SL, Coto-Montes A, Cottet S, Couve E, Covey LR, Cowart LA, Cox JS, Coxon FP, Coyne CB, Cragg MS, Craven RJ, Crepaldi T, Crespo JL, Criollo A, Crippa V, Cruz MT, Cuervo AM, Cuezva JM, Cui T, Cutillas PR, Czaja MJ, Czyzyk-Krzeska MF, Dagda RK, Dahmen U, Dai C, Dai W, Dai Y, Dalby KN, Dalla Valle L, Dalmasso G, D'Amelio M, Damme M, Darfeuille-Michaud A, Dargemont C, Darley-Usmar VM, Dasarathy S, Dasgupta B, Dash S, Dass CR, Davey HM, Davids LM, Dávila D, Davis RJ, Dawson TM, Dawson VL, Daza P, de Belleroche J, de Figueiredo P, de Figueiredo RC, de la Fuente J, De Martino L, De Matteis A, De Meyer GR, De Milito A, De Santi M, de Souza W, De Tata V, De Zio D, Debnath J, Dechant R, Decuypere JP, Deegan S, Dehay B, Del Bello B, Del Re DP, Delage-Mourroux R, Delbridge LM, Deldicque L, Delorme-Axford E, Deng Y, Dengjel J, Denizot M, Dent P, Der CJ, Deretic V, Derrien B, Deutsch E, Devarenne TP, Devenish RJ, Di Bartolomeo S, Di Daniele N, Di Domenico F, Di Nardo A, Di Paola S, Di Pietro A, Di Renzo L, DiAntonio A, Díaz-Araya G, Díaz-Laviada I, Diaz-Meco MT, Diaz-Nido J, Dickey CA, Dickson RC, Diederich M, Digard P, Dikic I, Dinesh-Kumar SP, Ding C, Ding WX, Ding Z, Dini L, Distler JH, Diwan A, Djavaheri-Mergny M, Dmytruk K, Dobson RC, Doetsch V, Dokladny K, Dokudovskaya S, Donadelli M, Dong XC, Dong X, Dong Z, Donohue TM Jr, Doran KS, D'Orazi G, Dorn GW 2nd, Dosenko V, Dridi S, Drucker L, Du J, Du LL, Du L, du Toit A, Dua P, Duan L, Duann P, Dubey VK, Duchen MR, Duchosal MA, Duez H, Dugail I, Dumit VI, Duncan MC, Dunlop EA, Dunn WA Jr, Dupont N, Dupuis L, Durán RV, Durcan TM, Duvezin-Caubet S, Duvvuri U, Eapen V, Ebrahimi-Fakhari D, Echard A, Eckhart L, Edelstein CL, Edinger AL, Eichinger L, Eisenberg T, Eisenberg-Lerner A, Eissa NT, El-Deiry WS, El-Khoury V, Elazar Z, Eldar-Finkelman H, Elliott CJ, Emanuele E, Emmenegger U, Engedal N, Engelbrecht AM, Engelender S, Enserink JM, Erdmann R, Erenpreisa J, Eri R, Eriksen JL, Erman A, Escalante R, Eskelinen EL, Espert L, Esteban-Martínez L, Evans TJ, Fabri M, Fabrias G, Fabrizi C, Facchiano A, Færgeman NJ, Faggioni A, Fairlie WD, Fan C, Fan D, Fan J, Fang S, Fanto M, Fanzani A, Farkas T, Faure M, Favier FB, Fearnhead H, Federici M, Fei E, Felizardo TC, Feng H, Feng Y, Feng Y, Ferguson TA, Fernández ÁF, Fernandez-Barrena MG, Fernandez-Checa JC, Fernández-López A, Fernandez-Zapico ME, Feron O, Ferraro E, Ferreira-Halder CV, Fesus L, Feuer R, Fiesel FC, Filippi-Chiela EC, Filomeni G, Fimia GM, Fingert JH, Finkbeiner S, Finkel T, Fiorito F, Fisher PB, 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JT, Yu J, Yu L, Yu WH, Yu XF, Yu Z, Yuan J, Yuan ZM, Yue BY, Yue J, Yue Z, Zacks DN, Zacksenhaus E, Zaffaroni N, Zaglia T, Zakeri Z, Zecchini V, Zeng J, Zeng M, Zeng Q, Zervos AS, Zhang DD, Zhang F, Zhang G, Zhang GC, Zhang H, Zhang H, Zhang H, Zhang H, Zhang J, Zhang J, Zhang J, Zhang J, Zhang JP, Zhang L, Zhang L, Zhang L, Zhang L, Zhang MY, Zhang X, Zhang XD, Zhang Y, Zhang Y, Zhang Y, Zhang Y, Zhang Y, Zhao M, Zhao WL, Zhao X, Zhao YG, Zhao Y, Zhao Y, Zhao YX, Zhao Z, Zhao ZJ, Zheng D, Zheng XL, Zheng X, Zhivotovsky B, Zhong Q, Zhou GZ, Zhou G, Zhou H, Zhou SF, Zhou XJ, Zhu H, Zhu H, Zhu WG, Zhu W, Zhu XF, Zhu Y, Zhuang SM, Zhuang X, Ziparo E, Zois CE, Zoladek T, Zong WX, Zorzano A, and Zughaier SM
- Subjects
- Animals, Biological Assay methods, Computer Simulation, Humans, Autophagy physiology, Biological Assay standards
- Published
- 2016
- Full Text
- View/download PDF
17. Enhancer of zeste acts as a major developmental regulator of Ciona intestinalis embryogenesis.
- Author
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Le Goff E, Martinand-Mari C, Martin M, Feuillard J, Boublik Y, Godefroy N, Mangeat P, Baghdiguian S, and Cavalli G
- Abstract
The paradigm of developmental regulation by Polycomb group (PcG) proteins posits that they maintain silencing outside the spatial expression domains of their target genes, particularly of Hox genes, starting from mid embryogenesis. The Enhancer of zeste [E(z)] PcG protein is the catalytic subunit of the PRC2 complex, which silences its targets via deposition of the H3K27me3 mark. Here, we studied the ascidian Ciona intestinalis counterpart of E(z). Ci-E(z) is detected by immunohistochemistry as soon as the 2- and 4-cell stages as a cytoplasmic form and becomes exclusively nuclear thereafter, whereas the H3K27me3 mark is detected starting from the gastrula stage and later. Morpholino invalidation of Ci-E(z) leads to the total disappearance of both Ci-E(z) protein and its H3K27me3 mark. Ci-E(z) morphants display a severe phenotype. Strikingly, the earliest defects occur at the 4-cell stage with the dysregulation of cell positioning and mitotic impairment. At later stages, Ci-E(z)-deficient embryos are affected by terminal differentiation defects of neural, epidermal and muscle tissues, by the failure to form a notochord and by the absence of caudal nerve. These major phenotypic defects are specifically rescued by injection of a morpholino-resistant Ci-E(z) mRNA, which restores expression of Ci-E(z) protein and re-deposition of the H3K27me3 mark. As observed by qPCR analyses, Ci-E(z) invalidation leads to the early derepression of tissue-specific developmental genes, whereas late-acting developmental genes are generally down-regulated. Altogether, our results suggest that Ci-E(z) plays a major role during embryonic development in Ciona intestinalis by silencing early-acting developmental genes in a Hox-independent manner., (© 2015. Published by The Company of Biologists Ltd.)
- Published
- 2015
- Full Text
- View/download PDF
18. Identification of autophagy genes in Ciona intestinalis: a new experimental model to study autophagy mechanism.
- Author
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Godefroy N, Hoa C, Tsokanos F, Le Goff E, Douzery EJ, Baghdiguian S, and Martinand-Mari C
- Subjects
- Amino Acid Sequence, Animals, Apoptosis, Apoptosis Regulatory Proteins chemistry, Apoptosis Regulatory Proteins metabolism, Ciona intestinalis embryology, Gene Expression Regulation, Developmental, Genome genetics, Humans, Models, Biological, Molecular Sequence Data, Phylogeny, RNA, Messenger genetics, RNA, Messenger metabolism, Saccharomyces cerevisiae genetics, Autophagy genetics, Ciona intestinalis cytology, Ciona intestinalis genetics, Models, Animal
- Abstract
Programmed cell death (PCD) is a mechanism implicated in many physiological and pathological processes. Until recently, apoptosis (self-killing) was the most largely studied mechanism of PCD but a growing number of laboratories are now interested in autophagy (self-eating). In the past few years data showing a tight link between both pathways has accumulated. Until now our laboratory used Ciona intestinalis, a chordate model in which in vivo experiments are possible, to study apoptosis. Recently, we showed that autophagy also occurs in the development of Ciona intestinalis and that the specific markers of both types of death are found in the same tissues and/or in the same cells. These results drove us to postulate that Ciona intestinalis can be a good model to study the link between apoptosis and autophagy. In this article, we conducted an in silico study of autophagy genes. We explored the genomes of Ciona intestinalis, of the second ascidian Ciona savignyi, and those of the classical biological models (Saccharomyces cerevisiae, Drosophila melanogaster, Caenorhabditis elegans and Homo sapiens) to extract and compare autophagy gene sequences. This genomic study was completed by an analysis of: (i) mRNA profile expression during development and (ii) the localization of Beclin protein by immunofluorescent staining in the Ciona intestinalis larvae. Taken together, the results allowed us to conclude that a complex autophagic machinery is present in Ciona intestinalis. Actually, the number of autophagy genes in Ciona intestinalis is comparable to the number of autophagy genes in human.
- Published
- 2009
- Full Text
- View/download PDF
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