Manioc : Portail | resultats 81 - 100 pour la recherche: Jeremie

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The late Carboniferous accretionary system of the South Tianshan orogen (North-Western China) underwent complex structural and polymetamorphic evolution. Combined petrological, geochronological and microstructural analysis of (ultra)high-pressure (UHP) metabasites (eclogites and blueschists) enclosed in metapelites show a relict coarse-grained eclogitic fabric S2 surrounded by a dominant fine-grained eclogite and blueschist facies retrograde fabric S2. The S2 fabric is reworked by upright folds F3 that are responsible for a major shortening of the whole accretionary system. For both the eclogite and blueschist, peak and retrograde P–T conditions have been thermodynamically constrained at 25–26 kbar and 425–500 °C and 10–13 kbar and 500−550 °C respectively, suggesting a shared exhumation history. The garnet-whole rock-amphibole isochron in the blueschist yielded Lu–Hf and Sm–Nd ages of 326.0 ± 2.9 Ma and 318.4 ± 3.9 Ma respectively, interpreted to date the prograde to peak metamorphic assemblage. The retrograde path of the eclogite is characterized by heterogeneous omphacite recrystallization into a mylonitic fine-grained matrix and crystallization of blue amphibole. Microstructures in both pristine porphyroclastic and recrystallized fine-grained domains in the eclogite indicate a gradual evolution from constriction-dominated (L>S-type) to flattening-dominated (S>L-type) type of deformation, increase of fabric intensity reflected by gradually growing M-indexes and the development of lattice preferred orientation (LPO) typical for dislocation creep under slightly hydrated conditions. Recrystallization of the matrix in the blueschist is homogeneous, which indicates a matrix dominated channel flow during exhumation. These LPOs evolutions suggest a significant mechanical coupling with the upper plate concomitant with oroclinal bending of the Kazakh orocline. Lock up of Kazakh orocline is responsible for further stress increase resulting in horizontal shortening of South Tianshan accretionary wedge and development of D3 upright folding and steepening of the whole sequence.
ISSN: 1342-937X

hal-01481263
https://hal.archives-ouvertes.fr/hal-01481263
DOI : 10.1016/j.gr.2016.07.007

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L'armée haïtienne : sa nécessité, son rôle
Auteur(s) : Légitime, François Denys (1841-1935)
Année de publication :

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Notes on Haïti, made during a residence in that republic : in two volumes. Volume 2
Auteur(s) : Mackenzie, Charles (1788-1862)
Année de publication :

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Recueil des lois relatives à la marine et aux colonies. Tome septième, Du 1er frimaire an V, au 1er vendémiaire an VI
Auteur(s) : France. Ministère de la marine et des colonies (1790-1893)
Année de publication :

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Molecular Evolution of the Tissue-nonspecific Alkaline Phosphatase Allows Prediction and Validation of Missense Mutations Responsible for Hypophosphatasia
Auteur(s) : Silvent, Jeremie Gasse, Barbara Mornet, Etienne Sire, Jean-Yves
Auteurs secondaires : Evolution et développement du squelette (EDS) ; Systématique, adaptation, évolution (SAE) ; Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Evolution Paris Seine ; Université des Antilles et de la Guyane (UAG) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) CNRS Universite Pierre Marie Curie patients' support group Hypophosphatasie Europe ``Societe Francaise de Biologie des Tissus Mineralises'' student award

Éditeur(s) : HAL CCSD American Society for Biochemistry and Molecular Biology
Résumé : International audience
Background: We used evolutionary analysis of alkaline phosphatase (tissue nonspecific alkaline phosphatase, TNSALP) to predict missense mutations leading to hypophosphatasia. Results: We found 469 sensitive positions and validated 99% of the 204 known mutations. Conclusion: It is a more powerful method than in silico models to validate missense mutations in TNSALP. Significance: Such an approach should be widely used to support genetic diagnostics. ALPL encodes the tissue nonspecific alkaline phosphatase (TNSALP), which removes phosphate groups from various substrates. Its function is essential for bone and tooth mineralization. In humans, ALPL mutations lead to hypophosphatasia, a genetic disorder characterized by defective bone and/or tooth mineralization. To date, 275 ALPL mutations have been reported to cause hypophosphatasia, of which 204 were simple missense mutations. Molecular evolutionary analysis has proved to be an efficient method to highlight residues important for the protein function and to predict or validate sensitive positions for genetic disease. Here we analyzed 58 mammalian TNSALP to identify amino acids unchanged, or only substituted by residues sharing similar properties, through 220 millions years of mammalian evolution. We found 469 sensitive positions of the 524 residues of human TNSALP, which indicates a highly constrained protein. Any substitution occurring at one of these positions is predicted to lead to hypophosphatasia. We tested the 204 missense mutations resulting in hypophosphatasia against our predictive chart, and validated 99% of them. Most sensitive positions were located in functionally important regions of TNSALP (active site, homodimeric interface, crown domain, calcium site, ...). However, some important positions are located in regions, the structure and/or biological function of which are still unknown. Our chart of sensitive positions in human TNSALP (i) enables to validate or invalidate at low cost any ALPL mutation, which would be suspected to be responsible for hypophosphatasia, by contrast with time consuming and expensive functional tests, and (ii) displays higher predictive power than in silico models of prediction.
ISSN: 0021-9258

hal-01545479
https://hal.archives-ouvertes.fr/hal-01545479
DOI : 10.1074/jbc.M114.576843

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Permanent Genetic Resources added to Molecular Ecology Resources Database 1 December 2012-31 January 2013.
Auteur(s) : Arranz, Silvia E. Avarre, Jean-Christophe Balasundaram, Chellam Bouza, Carmen Calcaterra, Nora B. Cézilly, Frank Chen, Shi-Long Cipriani, Guido
Auteurs secondaires : Instituto de Biología Molecular y Celular de Rosario (IBR) ; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Universidad Nacional de Rosario [Santa Fe] Faculty of Biochemistry and Pharmacy ; Universidad Nacional de Rosario [Santa Fe] Institut des Sciences de l'Evolution [Montpellier] (ISEM) ; Université de Montpellier (UM) - Institut de recherche pour le développement [IRD] : UR226 - Centre National de la Recherche Scientifique (CNRS) Department of Animal Science ; Bharathidasan University Departamento de Genética ; Universidad de Santiago de Compostela Biogéosciences [Dijon] (BGS) ; Centre National de la Recherche Scientifique (CNRS) - Université de Bourgogne (UB) - AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement Key Laboratory of Adaptation and Evolution of Plateau Biota ; Chinese Academy of Sciences [Beijing] (CAS) Department of Crop Science and Agricultural Engineering ; Università degli Studi di Udine - University of Udine [Italie]

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