RESUMO
TALEN is one of the most widely used tools in the field of genome editing. It enables gene integration and gene inactivation in a highly efficient and specific fashion. Although very attractive, the apparent simplicity and high success rate of TALEN could be misleading for novices in the field of gene editing. Depending on the application, specific TALEN designs, activity assessments and screening strategies need to be adopted. Here we report different methods to efficiently perform TALEN-mediated gene integration and inactivation in different mammalian cell systems including induced pluripotent stem cells and delineate experimental examples associated with these approaches.
Assuntos
Marcação de Genes/métodos , Genoma/genética , Ativação Transcricional/genética , Transfecção/métodos , Animais , Sequência de Bases , Linhagem Celular , Proteínas de Ligação a DNA/genética , Células HCT116 , Humanos , Dados de Sequência MolecularRESUMO
Sickle cell disease is a devastating blood disorder that originates from a single point mutation in the HBB gene coding for hemoglobin. Here, we develop a GMP-compatible TALEN-mediated gene editing process enabling efficient HBB correction via a DNA repair template while minimizing risks associated with HBB inactivation. Comparing viral versus non-viral DNA repair template delivery in hematopoietic stem and progenitor cells in vitro, both strategies achieve comparable HBB correction and result in over 50% expression of normal adult hemoglobin in red blood cells without inducing ß-thalassemic phenotype. In an immunodeficient female mouse model, transplanted cells edited with the non-viral strategy exhibit higher engraftment and gene correction levels compared to those edited with the viral strategy. Transcriptomic analysis reveals that non-viral DNA repair template delivery mitigates P53-mediated toxicity and preserves high levels of long-term hematopoietic stem cells. This work paves the way for TALEN-based autologous gene therapy for sickle cell disease.
Assuntos
Anemia Falciforme , Edição de Genes , Terapia Genética , Células-Tronco Hematopoéticas , Nucleases dos Efetores Semelhantes a Ativadores de Transcrição , Anemia Falciforme/terapia , Anemia Falciforme/genética , Edição de Genes/métodos , Animais , Células-Tronco Hematopoéticas/metabolismo , Humanos , Feminino , Camundongos , Terapia Genética/métodos , Nucleases dos Efetores Semelhantes a Ativadores de Transcrição/metabolismo , Nucleases dos Efetores Semelhantes a Ativadores de Transcrição/genética , Transplante de Células-Tronco Hematopoéticas , Globinas beta/genética , Proteína Supressora de Tumor p53/genética , Proteína Supressora de Tumor p53/metabolismo , Reparo do DNA , Mutação , Talassemia beta/terapia , Talassemia beta/genética , Modelos Animais de Doenças , Técnicas de Transferência de GenesRESUMO
Thromboembolic events are the main cause of mortality in BCR-ABL1-negative myeloproliferative neoplasms (MPNs) but their underlying mechanisms are largely unrecognized. The Janus kinase 2 (JAK2)V617F mutation is the most frequent genetic alteration leading to MPN. Usually found in haematopoietic progenitors and stem cells, this mutation has also been described in endothelial cells (ECs) of MPN patients. In this study, we have questioned the impact of the JAK2V617F mutation on EC phenotype and functions. We developed an induced pluripotent stem cells strategy to compare JAK2 mutant and wild-type ECs. Transcriptomic assays showed that several genes and pathways involved in inflammation, cell adhesion and thrombotic events were over-represented in JAK2V617F ECs and expression levels of von Willebrand factor and P-selectin (CD62P) proteins were increased. Finally, we found that leucocytes from MPN patients adhere more tightly to JAK2V617F ECs. Our results show that JAK2V617F ECs have a pro-inflammatory and pro-thrombotic phenotype and were functionally pro-adherent.