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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
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Locus of Control01:26

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Locus of control describes how individuals perceive the causes of events in their lives, influencing motivation and well-being. Introduced by Julian Rotter in 1954, it is categorized into internal and external locus of control.Internal Locus of ControlIndividuals with an internal locus of control believe their actions determine outcomes, fostering responsibility, self-efficacy, and motivation. For example, an employee may attribute career success to hard work. Research links this mindset to...
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A cruise control system in a car is designed to maintain a specified speed automatically by adjusting the gas pedal. The system continuously measures the vehicle's speed and makes fine adjustments to the pedal to achieve this goal. The root locus method is particularly useful for understanding how the cruise control system's behavior changes under varying conditions, such as when the car goes uphill, downhill, or faces strong wind resistance.
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Construction of Root Locus01:15

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The construction of a root locus involves several key steps to analyze and visualize the behavior of a system's poles with varying gain. The number of branches in the root locus equals the number of closed-loop poles and is symmetrical about the real axis.
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Properties of the Root Locus01:05

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The root locus method is an invaluable tool for analyzing higher-order systems without needing to factor the denominator of the transfer function. A pole of the system is identified when the characteristic polynomial in the transfer function's denominator equals zero.
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Julian Rotter introduced the concept of locus of control, a cognitive factor that significantly influences personality development and learning. Locus of control refers to an individual's beliefs about the extent of control they have over events in their lives. According to Rotter, this belief system can be categorized into two types: internal and external locus of control.
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Evaluation of Cerebral Blood Flow Autoregulation in the Rat Using Laser Doppler Flowmetry
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Temporal autoregulation during human PU.1 locus SubTAD formation.

Daniel Schuetzmann1, Carolin Walter2, Boet van Riel1

  • 1Institute of Molecular Tumor Biology and.

Blood
|October 14, 2018
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Summary

The study reveals how the transcription factor PU.1 controls gene expression via chromosomal loops. These interactions, crucial for myeloid differentiation, are disrupted in acute myeloid leukemia (AML).

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Area of Science:

  • Genomics and Epigenetics
  • Molecular Biology
  • Cancer Research

Background:

  • Epigenetic gene regulation relies on the 3D organization of chromatin within topologically associating domains (TADs).
  • The precise spatial requirements for gene regulation, especially in cancer, remain largely undefined.
  • Understanding these spatial dynamics is critical for deciphering gene dysregulation in diseases like acute myeloid leukemia (AML).

Purpose of the Study:

  • To investigate the 3D genome organization of the PU.1 gene locus in healthy monocytes and AML cells.
  • To identify the specific genomic regions and regulatory elements involved in PU.1 gene expression control.
  • To elucidate the role of PU.1 autoregulation and LDB1 in establishing and maintaining spatial chromatin interactions.

Main Methods:

  • High-resolution chromosomal conformation capture sequencing (Hi-C) was employed.
  • Mapping the 3D organization of the human PU.1 locus in both healthy and cancerous myeloid cells.
  • Analysis of dynamic chromosomal interactions within a defined genomic unit.

Main Results:

  • A dynamic ∼75-kb unit, termed a SubTAD, was identified as the key region for PU.1 gene regulatory element interactions.
  • These spatial interactions are essential for myeloid differentiation but are disrupted in AML.
  • PU.1 autoregulation initiates these interactions by recruiting LDB1, which subsequently stabilizes them independently.

Conclusions:

  • PU.1 autoregulation acts in a "hit-and-run" mechanism to initiate stable chromosomal loops.
  • These loops establish a transcriptionally active chromatin architecture necessary for myeloid gene expression.
  • Disruption of this process in AML highlights a novel mechanism of gene dysregulation in cancer.