Selection of Reprogramming Factors of Induced Pluripotent Stem Cells Based on the Protein Interaction Network and Functional Profiles

2012 ◽  
Vol 19 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Tao Huang ◽  
Yu-Dong Cai ◽  
Lei Chen ◽  
Le-Le Hu ◽  
Xiang-Yin Kong ◽  
...  
Author(s):  
Kee-Pyo Kim ◽  
Dong Wook Han ◽  
Johnny Kim ◽  
Hans R. Schöler

AbstractEctopic expression of Oct4, Sox2, Klf4 and c-Myc can reprogram somatic cells into induced pluripotent stem cells (iPSCs). Attempts to identify genes or chemicals that can functionally replace each of these four reprogramming factors have revealed that exogenous Oct4 is not necessary for reprogramming under certain conditions or in the presence of alternative factors that can regulate endogenous Oct4 expression. For example, polycistronic expression of Sox2, Klf4 and c-Myc can elicit reprogramming by activating endogenous Oct4 expression indirectly. Experiments in which the reprogramming competence of all other Oct family members tested and also in different species have led to the decisive conclusion that Oct proteins display different reprogramming competences and species-dependent reprogramming activity despite their profound sequence conservation. We discuss the roles of the structural components of Oct proteins in reprogramming and how donor cell epigenomes endow Oct proteins with different reprogramming competences.


2012 ◽  
Vol 90 (2) ◽  
pp. 115-123 ◽  
Author(s):  
Saeideh Nakhaei-Rad ◽  
Ahmad R. Bahrami ◽  
Mahdi Mirahmadi ◽  
Maryam M. Matin

Induced pluripotent stem cells are generated by direct reprogramming of somatic cells with the introduction of defined transcription factors or other means. Clinical applications of induced pluripotent stem cells are the latest of stem cell therapy approaches due to overcoming problems associated with insufficient cells from conventional sources and immune rejections. In practice, this is restricted by 4 major barriers including the use of genetic manipulations for delivering the reprogramming factors, low efficiency of this process, slow kinetics of the direct reprogramming, and potential for tumor development. Here, we review the latest achievements in improving reprogramming efficiency by alternative strategies. These alternatives mainly involve the replacement of genetic reprogramming factors with small molecules or other factors.


2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ryan O'Doherty ◽  
Udo Greiser ◽  
Wenxin Wang

The concept of inducing pluripotency to adult somatic cells by introducing reprogramming factors to them is one that has recently emerged, gained widespread acclaim and garnered much attention among the scientific community. The idea that cells can be reprogrammed, and are not unidirectionally defined opens many avenues for study. With their clear potential for use in the clinic, these reprogrammed cells stand to have a huge impact in regenerative medicine. This realization did not occur overnight but is, however, the product of many decades worth of advancements in researching this area. It was a combination of such research that led to the development of induced pluripotent stem cells as we know it today. This review delivers a brief insight in to the roots of iPS research and focuses on succinctly describing current nonviral methods of inducing pluripotency using plasmid vectors, small molecules and chemicals, and RNAs.


2013 ◽  
Vol 2 (8) ◽  
pp. 558-566 ◽  
Author(s):  
Lin Ye ◽  
Marcus O. Muench ◽  
Noemi Fusaki ◽  
Ashley I. Beyer ◽  
Jiaming Wang ◽  
...  

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