1 / 1

Integrating viral vectors*

SAFETY. EFFICIENCY. Integrating viral vectors*. Excisable viral vectors*. Reprogramming proteins. piggyBac transposon. Non-integrating vectors. Eliminates risks associated with genome modification; non-DNA approach Very slow process.

domani
Download Presentation

Integrating viral vectors*

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. SAFETY EFFICIENCY Integrating viral vectors* Excisable viral vectors* Reprogramming proteins piggyBac transposon Non-integrating vectors Eliminates risks associated with genome modification; non-DNA approach Very slow process Precise transposon excision leaves no ‘footprints’ of exogenous DNA Time-consuming; excision may be inefficient Low frequency of integration Repeated transfection/infection required; possibility of random insertion of vector fragments Easy to use; reproducible; allows secondary iPSC generation Increased risk of insertional mutagenesis; possibility of transgene reactivation; incomplete silencing (lentiviruses) Efficient Cre-mediated removal of transgenes Exogenous DNA (primarily viral LTR) remains integrated following excision advantages disadvantages REPROGRAMMING Differentiated somatic cell iPSCs REPROGRAMMING FACTORS MOUSE: Oct4 (Nr5a2), Klf4 (Esrrb, Klf2 or Klf5), Sox2 (Sox1), c-Myc (N-Myc or L-Myc) HUMAN: Oct4, Klf4, Sox2 , c-Myc, Nanog, Lin28, hTERT, SV40LT SMALL MOLECULES# VPA (histone deacetylase inhibitor); BIX-01294 (histone methyltransferase inhibitor); vitamin C; 5’-azaC (DNA methyltransferase inhibitor); BIO (GSK3 inhibitor); ALK5 and RepSox (inhibitors of TGF-β signaling); BayK8644 (L-type Calcium channel agonist); kenpaullone (kinase inhibitor) STARTING CELL POPULATION MOUSE: embryonic and adult fibroblasts, neural stem cells, hepatocytes, gastric epithelial cells, B- cells HUMAN: keratinocytes, skin fibroblasts, embryonic fibroblasts, CD34+ peripheral blood cells Cell types with high endogenous levels of a reprogramming factor require a minimal cocktail of factors Small molecules can substitute for a reprogramming factor and/or enhance reprogramming efficiency

More Related