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Cancer research

DNA Regulatory Switch Prompts Stem Cells to Give Rise to Blood

Strategic Insights

— 2 min read

A groundbreaking study led by Dr. Stephen D. Nimer, Director of Sylvester Comprehensive Cancer Center at the University of Miami Miller School of Medicine, has revealed a key regulator of gene expression called TAF1 as a potential drug target in leukemia and other blood cancers. The study, published in the journal Developmental Cell, takes a deep dive into how TAF1 operates to promote the development of new blood cells, shedding light on the intricate interactions between cellular molecules involved in blood formation and blood cancers.

Key Takeaways:

  • The study challenges prevailing models of hematopoietic regulation, revealing that TAF1 plays a more fine-tuned role in gene regulation, preferentially turning on genes that prompt hematopoietic stem cells (HSCs) to differentiate into mature blood cells.
  • TAF1 activates genes involved in lineage commitment in adults, but has a reduced role in HSC self-renewal, according to the findings.
  • The data demonstrate that TAF1 operates differently during embryogenesis, when there is a much higher demand for blood production, and serves as a key molecular switch that integrates transcriptional signals to balance stem cell maintenance with lineage commitment in adults.
  • The study's lead author, Dr. Fan Liu, noted that adult HSCs can survive without TAF1, and that the loss of TAF1 only affects the activation of differentiation-associated genes, not self-renewal-promoting genes.
  • The findings provide momentum to studies investigating TAF1-targeting agents, which are under development, and suggest that TAF1 inhibitors might fulfill the criterion of being powerful enough to kill cancer cells without killing normal blood cell development.
  • Dr. Nimer credits the working relationships he and his colleagues have fostered with supporting high-quality research, despite the demands on their time, and notes that the team has been together for many years, establishing one of the only cancer epigenetics programs in the country.

Statistics:

  • The study was published in the journal Developmental Cell on July 16, 2023.
  • The team has authored seven papers together, including the new study.
  • TAF1 is part of a large molecular machine that binds to DNA and helps activate genes.
  • In the current study, the researchers took a closer look at TAF1 to better understand how it operates in normal blood cell development.
  • Blood cells arise from immature cells in the bone marrow called hematopoietic stem cells (HSCs).
  • HSCs are powerful cells that are used for transplantation and have two key functions: self-renewal and giving rise to mature cell types.
  • TAF1 activates genes involved in lineage commitment in adults, but has a reduced role in HSC self-renewal.

Sources:

  • University of Miami Miller School of Medicine, "DNA Regulatory Switch Prompts Stem Cells to Give Rise to Blood," July 24, 2023
  • Developmental Cell, "TAF1 is a key molecular switch that integrates transcriptional signals to balance stem cell maintenance with lineage commitment in adults," July 16, 2023
  • American Society of Hematology, "Dr. Stephen D. Nimer named Mentor of the Year in 2024"
  • News.Med.Miami.edu, "Original text here: https://news.med.miami.edu/dna-regulatory-switch-prompts-stem-cells-to-give-rise-to-blood/"

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