Transcriptional Regulation in Hematopoietic Development
Summary
The formation of blood and immune cells from multipotent haematopoietic stem cells (HSCs) is governed by a finely tuned transcriptional programme. At each stage of differentiation, lineage-specific transcription factors cooperate with chromatin-modifying enzymes and co-regulators to activate or repress cohorts of genes. Early in development, homeobox proteins and basic helix-loop-helix factors establish a permissive chromatin landscape in the mesoderm and drive definitive HSC emergence in the embryonic liver and aorta-gonad-mesonephros region. Throughout adult haematopoiesis, factors such as GATA, RUNX and E-protein families balance self-renewal against lineage commitment by controlling enhancer accessibility and recruiting epigenetic modifiers. Transcriptional repressors and co-repressors ensure that alternative lineage programmes remain silent, while non-coding elements and long-range interactions sculpt dynamic three-dimensional chromatin architecture. Defects in these regulatory circuits underlie bone-marrow failure syndromes, leukaemia and immunodeficiencies, and are the focus of emerging therapies based on targeted modulation of transcriptional complexes.
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Transcriptional Regulation in Hematopoietic Development publication trend
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Technical terms
Transcription factor: A protein that binds specific DNA sequences to regulate the transcription of target genes.
Hematopoietic stem cell: A self-renewing progenitor capable of generating all blood and immune cell types.
Transcriptional repression: The inhibition of gene expression by factors that prevent assembly or activity of the transcriptional machinery.
Homeobox gene: A gene containing a conserved 60-amino-acid motif (homeodomain) that encodes a DNA-binding transcription factor central to developmental processes.
Co-repressor: A protein that associates with DNA-bound transcription factors to suppress gene transcription without directly binding to DNA.
References
- The Haematopoietically-expressed homeobox transcription factor: roles in development, physiology and disease. Frontiers in Immunology (2023).
- The Proline-rich Homeodomain Protein Recruits Members of the Groucho/Transducin-like Enhancer of Split Protein Family to Co-repress Transcription in Hematopoietic Cells*. Journal of Biological Chemistry (2004).
- PRH Represses Transcription in Hematopoietic Cells by at Least Two Independent Mechanisms*. Journal of Biological Chemistry (2000).
- The Proline Rich Homeodomain Protein PRH/Hhex Forms Stable Oligomers That Are Highly Resistant to Denaturation. PLOS ONE (2012).
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