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How do transcription factors guide a cell toward a specialized function?
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stem cell
Stem cells of neural and hematopoietic origin have tremendous potential in the development of therapies for certain diseases, such as diabetes and Parkinson disease. Neural stem cells occur in the spinal cord and in specific regions of the brain, and hematopoietic stem cells occur in the blood and bone marrow.
Transcription factors guide a cell toward a specialized function by regulating which genes are expressed, a process fundamental to cell differentiation. While all cells in an organism typically contain the same genetic information, they become specialized by activating specific sets of genes while repressing others.1
Transcription factors act as the primary controllers of this process by binding to specific regulatory sequencesâsuch as promoters and enhancersâwithin the DNA. Their role in specialization includes:21
- Gene Activation and Repression: Transcription factors can either activate or inhibit the transcription of genes, determining whether a gene is functional at a given time.21
- Chromatin Remodeling: They often recruit enzymes that modify histones, which alters the structure of chromatin. By opening or closing these structures, they control the accessibility of DNA to the machinery required for transcription.1
- Combinatorial Control: Specialization usually requires several transcription factors working in combination to ensure that only the correct genes are expressed for a specific cell type.1
- Maintaining Stability: Once a cell is specialized, transcription factors can participate in feedback loops to maintain that state across successive cell generations.21