5 research outputs found
Correction of Fanconi Anemia Group C Hematopoietic Stem Cells Following Intrafemoral Gene Transfer
The main cause of morbidity and mortality in Fanconi anemia patients is the development of bone marrow (BM) failure; thus correction of hematopoietic stem cells (HSCs) through gene transfer approaches would benefit FA patients. However, gene therapy trials for FA patients using ex vivo transduction protocols have failed to provide long-term correction. In addition, ex vivo cultures have been found to be hazardous for FA cells. To circumvent negative effects of ex vivo culture in FA stem cells, we tested the corrective ability of direct injection of recombinant lentiviral particles encoding FancC-EGFP into femurs of FancCâ/â mice. Using this approach, we show that FancCâ/â HSCs were efficiently corrected. Intrafemoral gene transfer of the FancC gene prevented the mitomycin C-induced BM failure. Moreover, we show that intrafemoral gene delivery into aplastic marrow restored the bone marrow cellularity and corrected the remaining HSCs. These results provide evidence that targeting FA-deficient HSCs directly in their environment enables efficient and long-term correction of BM defects in FA
oralité, littératie
Plus de dix ans aprĂšs une livraison de la revue Pratiques consacrĂ© aux travaux dâanthropologie du langage selon J. Goody, il nous parait nĂ©cessaire de faire le point sur les usages actuels de la notion de littĂ©ratie et dâoralitĂ©, en linguistique, en didactique et en littĂ©rature. Ces termes dâoralitĂ© et de littĂ©ratie â ce dernier surtout, avec lâacception commune de « culture Ă©crite » â sont en effet omniprĂ©sents dans le champ thĂ©orique et professionnel mais souvent de façon dissociĂ©e. Cette livraison contribue Ă interroger leurs articulations selon trois volets distincts : Un volet Ă©pistĂ©mologique qui cartographie plus prĂ©cisĂ©ment les dĂ©finitions sĂ©miologiques, linguistiques et socio-symboliques des termes oralitĂ© et littĂ©ratie ; et qui sâapplique Ă clarifier les distinctions entre oral et oralitĂ©, entre scripturalitĂ© et littĂ©ratie. Un volet dâapplications pratiques Ă partir dâanalyses variĂ©es sur les modalitĂ©s de coprĂ©sence ou de de conjonction plus ou moins hybride de ces deux mĂȘmes modes dans des discours, littĂ©raires ou non. Un volet ouvert aux pratiques scolaires et Ă la didactique qui analyse des modes ou des stratĂ©gies dâentrĂ©e dans la littĂ©ratie dans ses formes graphiques et ses dispositifs symboliques. Sans nĂ©gliger la question des normes et des variations linguistiques quand il est question dâĂ©valuer les productions langagiĂšres des Ă©lĂšves (qui Ă©criraient comme ils parlent ?)
The Fanconi Anemia Core Complex Acts as a Transcriptional Co-regulator in Hairy Enhancer of Split 1 Signaling*Sâ
Mutations in one of the 13 Fanconi anemia (FA) genes cause a progressive
bone marrow failure disorder associated with developmental abnormalities and a
predisposition to cancer. Although FA has been defined as a DNA repair disease
based on the hypersensitivity of patient cells to DNA cross-linking agents, FA
patients develop various developmental defects such as skeletal abnormalities,
microphthalmia, and endocrine abnormalities that may be linked to
transcriptional defects. Recently, we reported that the FA core complex
interacts with the transcriptional repressor Hairy Enhancer of Split 1 (HES1)
suggesting that the core complex plays a role in transcription. Here we show
that the FA core complex contributes to transcriptional regulation of
HES1-responsive genes, including HES1 and the cyclin-dependent kinase
inhibitor p21cip1/waf1. Chromatin immunoprecipitation
studies show that the FA core complex interacts with the HES1
promoter but not the p21cip1/waf1 promoter. Furthermore,
we show that the FA core complex interferes with HES1 binding to the
co-repressor transducin-like-Enhancer of Split, suggesting that the core
complex affects transcription both directly and indirectly. Taken together
these data suggest a novel function of the FA core complex in transcriptional
regulation