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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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...
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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...
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Combinatorial Gene Control02:33

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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.
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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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...
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Related Experiment Video

Updated: Oct 11, 2025

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
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KAT6A and ENL Form an Epigenetic Transcriptional Control Module to Drive Critical Leukemogenic Gene-Expression

Fangxue Yan1,2, Jinyang Li2, Jelena Milosevic3

  • 1Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

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|December 2, 2021
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Summary

Researchers identified KAT6A as a key regulator of acute myeloid leukemia (AML) cell fate. Inhibiting KAT6A shows promise for AML treatment by overcoming differentiation arrest.

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Area of Science:

  • * Hematology
  • * Molecular Biology
  • * Cancer Research

Background:

  • * Acute myeloid leukemia (AML) is characterized by dysregulated epigenetic programs leading to differentiation arrest.
  • * Identifying key epigenetic regulators is crucial for understanding AML cell fate and developing targeted therapies.

Purpose of the Study:

  • * To identify novel epigenetic regulators controlling AML cell differentiation and leukemogenesis.
  • * To elucidate the molecular mechanisms by which these regulators influence AML cell fate.

Main Methods:

  • * A differentiation-focused CRISPR screen was employed in AML cells to identify key epigenetic regulators.
  • * Mechanistic studies involved analyzing KAT6A's role in transcriptional control, including its interaction with ENL and chromatin factors.

Main Results:

  • * The CRISPR screen identified KAT6A (histone acetyltransferase) as a novel regulator of myeloid differentiation in AML.
  • * KAT6A initiates a transcriptional control module involving H3K9ac, ENL, and chromatin factors, driving leukemogenic gene expression.
  • * Inhibition of KAT6A demonstrated significant anti-AML effects both in vitro and in vivo.

Conclusions:

  • * KAT6A is a critical epigenetic regulator and therapeutic target in acute myeloid leukemia.
  • * Targeting KAT6A offers a potential differentiation-based therapeutic strategy for AML, either as monotherapy or in combination treatments.