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51.
Inesse Ben-Abdallah-Bouhjar Soumya Mougou-Zerelli Hanene Hannachi Hela Ben-Khelifa Najla Soyah Audrey Labalme Damien Sanlaville Hatem Elghezal Ali Saad 《Gene》2013
Partial duplication of 11q is related to several malformations like growth retardation, intellectual disability, hypoplasia of corpus callosum, short nose, palate defects, cardiac, urinary tract abnormalities and neural tube defects. We have studied the clinical and molecular characteristics of a patient with severe intellectual disabilities, dysmorphic features, congenital inguinal hernia and congenital cerebral malformation which is referred to as cytogenetic exploration. We have used FISH and array CGH analysis for a better understanding of the double chromosomic aberration involving a 7p microdeletion along with a partial duplication of 11q due to adjacent segregation of a paternal reciprocal translocation t(7;11)(p22;q21) revealed after banding analysis. The patient's karyotype formula was: 46,XY,der(7)t(7;11)(p22;q21)pat. FISH study confirmed these rearrangement and array CGH technique showed precisely the loss of at least 140 Kb on chromosome7p22.3pter and 33.4 Mb on chromosome11q22.1q25. Dysmorphic features, severe intellectual disability and brain malformations could result from the 11q22.1q25 trisomy. Our study provides an additional case for better understanding and delineating the partial duplication 11q. 相似文献
52.
J.H. Prost 《Visual Anthropology: Published in cooperation with the Commission on Visual Anthropology》2013,26(2):79-95
Word responses have been used to dedde whether pictures of expressive faces or postures portray truthful expressions. Previous investigators have assumed words are used only as symbols of “meaning”. They did not appreciate the use of words as symbols of “sorting”. If one viewer calls two photographs “angry” and another viewer calls the same two photographs “happy,” the viewers may disagree in their “meanings” but they agree in their ‘sortings” both agree each photograph portrays the same expression. Sorting groups reveal how the visual system processes photographic images. 相似文献
53.
ADP-ribosylation factors (ARFs) are monomeric G proteins that regulate many cellular processes such as reorganization of the actin cytoskeleton. We have previously shown that ARF1 is overexpressed in highly invasive breast cancer cells and contribute to their enhanced migration. In this study, we propose to define the molecular mechanism by which ARF1 regulates this complex cellular response by investigating the role of this ARF GTPase on the activation process of Rac1, a Rho GTPase, associated with lamellipodia formation during cell migration. Here, we first show that inhibition of ARF1 or Rac1 expression markedly impacts the ability of MDA-MB-231 cells to migrate upon EGF stimulation. However, the effect of ARF1 depletion can be reversed by overexpression of the Rac1 active mutant, Rac1 Q61L. Depletion of ARF1 also impairs the ability of EGF stimulation to promote GTP-loading of Rac1. To further investigate the possible cross-talk between ARF1 and Rac1, we next examined whether they could form a complex. We observed that the two GTPases could directly interact independently of the nature of the nucleotide bound to them. EGF treatment however resulted in the association of Rac1 with its effector IRSp53, which was completely abrogated in ARF1 depleted cells. We present evidences that this ARF isoform is responsible for the plasma membrane targeting of both Rac1 and IRSp53, a step essential for lamellipodia formation. In conclusion, this study provides a new mechanism by which ARF1 regulates cell migration and identifies this GTPase as a promising pharmacological target to reduce metastasis formation in breast cancer patients. 相似文献
54.
Audrey Boulamery Gais Kadra Nicolas Simon Thierry Besnard 《Chronobiology international》2013,30(5):961-968
There are no studies indicating a possible modification of imipenem pharmacokinetics related to the hour (i.e., circadian time) of its administration. The aim of this study was to evaluate the influence of different times of intramuscular imipenem administration on its disposition in Wistar AF EOPS rats. Four groups of eight animals were given a single intramuscular injection of 140 mg/kg of imipenem either at 10∶00, 16∶00, 22∶00, or 04∶00 h. Blood samples were collected 0.5, 1, 2, 3, 4, 6, and 8 h after drug injection, and the main pharmacokinetic parameters determined were Cmax, Tmax, elimination half‐life (t1/2), area under the concentration‐versus‐time curve (AUC), total serum clearance (CL/F), and volume of distribution (V/F). Circadian variation of Cmax (49%), Tmax (92%), and AUC (19%) was observed leading to variability of imipenem exposure. Clearance and volume of distribution were modified according to the circadian time of drug injection but did not reach statistical significance. The results suggest that varying the time of administration induces intra‐individual variability. 相似文献
55.
Sébastien Besseau Franziska Kellner Arnaud Lanoue Antje M.K. Thamm Vonny Salim Bernd Schneider Fernando Geu-Flores René H?fer Grégory Guirimand Anthony Guihur Audrey Oudin Ga?lle Glevarec Emilien Foureau Nicolas Papon Marc Clastre Nathalie Giglioli-Guivarc’h Benoit St-Pierre Danièle Werck-Reichhart Vincent Burlat Vincenzo De Luca Sarah E. O’Connor Vincent Courdavault 《Plant physiology》2013,163(4):1792-1803
56.
Peter M. Bowers Tamlyn Y. Neben Geoffery L. Tomlinson Jennifer L. Dalton Larry Altobell Xue Zhang John L. Macomber Betty F. Wu Rachelle M. Toobian Audrey D. McConnell Petra Verdino Betty Chau Robert A. Horlick David J. King 《The Journal of biological chemistry》2013,288(11):7688-7696
A method for simultaneous humanization and affinity maturation of monoclonal antibodies has been developed using heavy chain complementarity-determining region (CDR) 3 grafting combined with somatic hypermutation in vitro. To minimize the amount of murine antibody-derived antibody sequence used during humanization, only the CDR3 region from a murine antibody that recognizes the cytokine hβNGF was grafted into a nonhomologous human germ line V region. The resulting CDR3-grafted HC was paired with a CDR-grafted light chain, displayed on the surface of HEK293 cells, and matured using in vitro somatic hypermutation. A high affinity humanized antibody was derived that was considerably more potent than the parental antibody, possessed a low pm dissociation constant, and demonstrated potent inhibition of hβNGF activity in vitro. The resulting antibody contained half the heavy chain murine donor sequence compared with the same antibody humanized using traditional methods. 相似文献
57.
58.
Yoan Fourcade Audrey Chaput‐Bardy Jean Secondi Cyril Fleurant Christophe Lemaire 《Molecular ecology》2013,22(8):2065-2073
Identifying local adaptation is crucial in conservation biology to define ecotypes and establish management guidelines. Local adaptation is often inferred from the detection of loci showing a high differentiation between populations, the so‐called FST outliers. Methods of detection of loci under selection are reputed to be robust in most spatial population models. However, using simulations we showed that FST outlier tests provided a high rate of false‐positives (up to 60%) in fractal environments such as river networks. Surprisingly, the number of sampled demes was correlated with parameters of population genetic structure, such as the variance of FSTs, and hence strongly influenced the rate of outliers. This unappreciated property of river networks therefore needs to be accounted for in genetic studies on adaptation and conservation of river organisms. 相似文献
59.
60.
Sofiane El‐Kirat‐Chatel Dalila Mil‐Homens Audrey Beaussart Arsenio M. Fialho Yves F. Dufrêne 《Molecular microbiology》2013,89(4):649-659
Trimeric autotransporter adhesins (TAAs) are bacterial surface proteins that fulfil important functions in pathogenic Gram‐negative bacteria. Prominent examples of TAAs are found in Burkholderia cepacia complex, a group of bacterial species causing severe infections in patients with cystic fibrosis. While there is strong evidence that Burkholderia cenocepacia TAAs mediate adhesion, aggregation and colonization of the respiratory epithelium, we still know very little about the molecular mechanisms behind these interactions. Here, we use single‐molecule atomic force microscopy to unravel the binding mechanism of BCAM0224, a prototype TAA from B. cenocepacia K56‐2. We show that the adhesin forms homophilic trans‐interactions engaged in bacterial aggregation, and that it behaves as a spring capable to withstand high forces. We also find that BCAM0224 binds collagen, a major extracellular component of host epithelia. Both homophilic and heterophilic interactions display low binding affinity, which could be important for epithelium colonization. We then demonstrate that BCAM0224 recognizes receptors on living pneumocytes, and leads to the formation of membrane tethers that may play a role in promoting adhesion. Collectively, our results show that BCAM0224 is a multifunctional adhesin endowed with remarkable binding properties, which may represent a general mechanism among TAAs for strengthening bacterial adhesion. 相似文献