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Pioneer transcription factors in cell reprogramming
Makiko Iwafuchi-Doi1, Kenneth S Zaret2
1Institute for Regenerative Medicine, Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Genes & Development
|December 17, 2014
Summary
Certain transcription factors, known as pioneer factors, can reprogram cells by accessing silenced genes in closed chromatin. Understanding how they bind chromatin and how heterochromatin blocks binding is key to controlling cell fate reprogramming.
Area of Science:
- Molecular Biology
- Developmental Biology
- Epigenetics
Background:
- Eukaryotic transcription factors can reprogram cell fate.
- Reprogramming factors are crucial for embryonic development.
- Accessing developmentally silenced genes is essential for reprogramming.
Purpose of the Study:
- To review the mechanisms by which transcription factors engage closed chromatin.
- To explore the role of pioneer factors in cell reprogramming.
- To understand how heterochromatin impedes pioneer factor binding.
Main Methods:
- Biochemical studies of transcription factor binding.
- Genomic analyses of chromatin accessibility.
- Review of existing literature on pioneer factors and chromatin structure.
Main Results:
- Pioneer factors can engage target sites on nucleosomal DNA in closed chromatin.
- Some reprogramming factors depend on pioneer factors for chromatin access.
- Heterochromatin poses a barrier to pioneer factor binding.
Conclusions:
- Pioneer factors initiate reprogramming by accessing closed chromatin.
- Understanding chromatin binding mechanisms is crucial for advancing cell reprogramming.
- Further research into heterochromatin's role could enable precise cell fate control.
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