Related Experiment Video
Updated: Aug 14, 2026
11:40
Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation
Published on: October 20, 2014
The transcription factor PU.1 does not regulate lineage commitment but has lineage-specific effects
S R McKercher1, G W Henkel, R A Maki
1The Burnham Institute, La Jolla, California 92037, USA.
Journal of Leukocyte Biology
|November 30, 1999
Summary
The transcription factor PU.1 is crucial for developing mature myeloid and B cells. Without PU.1, mice lack these cells, highlighting its essential role in hematopoietic development.
Area of Science:
- Hematology
- Molecular Biology
- Immunology
Background:
- PU.1 is a key transcription factor regulating gene expression in myeloid and B lymphocytes.
- Hematopoietic stem cell differentiation is a complex process involving numerous regulatory factors.
Purpose of the Study:
- To investigate the role of the transcription factor PU.1 in hematopoietic cell development.
- To determine the necessity of PU.1 for the maturation of specific myeloid and B cell lineages.
Main Methods:
- Analysis of mice with homozygous disruption of the PU.1 gene.
- Cellular characterization of hematopoietic populations in PU.1 deficient mice.
- Rescue experiments involving transfection of PU.1 into early monocytic cells.
Main Results:
- Mice lacking PU.1 lack mature myeloid and B cells, including neutrophils, eosinophils, mast cells, and monocytes.
- Erythrocytes, megakaryocytes, and T cells are present in PU.1 deficient mice.
- Restoration of PU.1 in early monocytic cells leads to their differentiation into macrophages.
Conclusions:
- PU.1 is essential for the development and maturation of myeloid and B cell lineages.
- The transcription factor PU.1 plays a critical regulatory role in the hematopoietic system.
- Targeting PU.1 may offer therapeutic strategies for hematological disorders.
Related Concept Videos
02:36RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
02:33Combinatorial Gene Control
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
01:21Lineage Commitment
Commitment is the process whereby stem cells:
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...