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RNA-based Reprogramming of Human Primary Fibroblasts into Induced Pluripotent Stem Cells
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An integrated systems biology approach identifies positive cofactor 4 as a factor that increases reprogramming
Junghyun Jo1, Sohyun Hwang2, Hyung Joon Kim3
1Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea.
Nucleic Acids Research
|January 8, 2016
Summary
Spermatogonial stem cells naturally reprogram into multipotent stem cells. Positive cofactor 4 (Pc4) enhances this process by boosting key pluripotency gene activity.
Area of Science:
- Stem cell biology
- Molecular biology
- Epigenetics
Background:
- Spermatogonial stem cells (SSCs) possess a unique capacity for spontaneous dedifferentiation into embryonic stem cell (ESC)-like cells, termed multipotent SSCs (mSSCs).
- SSCs intrinsically express key pluripotency genes (Oct4, Sox2, Klf4, Myc), suggesting endogenous mechanisms regulate reprogramming.
- Understanding mSSC reprogramming can reveal novel endogenous factors involved in pluripotency and cell fate determination.
Purpose of the Study:
- To identify endogenous factors that regulate spontaneous reprogramming of SSCs into mSSCs.
- To compare the transcriptional pathways of mSSC reprogramming with those of induced pluripotent stem cells (iPSCs).
- To investigate the role of identified factors in enhancing somatic cell reprogramming.
Main Methods:
- Comparative transcriptome analysis of mSSCs and iPSCs.
- Integrated systems biology approach to identify putative pluripotency regulatory factors.
- Functional validation of candidate factors in somatic cell reprogramming.
Main Results:
- Transcriptome analysis revealed similar pluripotency states between mSSCs and iPSCs, despite distinct transcriptional pathways.
- Identified 53 candidate genes as potential pluripotency regulatory factors.
- Demonstrated that Positive cofactor 4 (Pc4) enhances somatic cell reprogramming efficiency by promoting and sustaining the transcriptional activity of key reprogramming factors.
Conclusions:
- Pc4 plays a significant role in inducing spontaneous somatic cell reprogramming.
- Pc4 up-regulates key pluripotency genes, contributing to endogenous reprogramming processes.
- The study highlights Pc4 as a potential factor for improving reprogramming technologies.
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