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Related Concept Videos

General Transcription Factors01:30

General Transcription Factors

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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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Transcription Factors02:16

Transcription Factors

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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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Combinatorial Gene Control02:33

Combinatorial Gene Control

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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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RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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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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Master Transcription Regulators02:23

Master Transcription Regulators

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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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Transcription01:10

Transcription

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Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
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Modulation of transcription factor dynamics allows versatile information transmission.

Alan Givré1,2, Alejandro Colman-Lerner3,4, Silvina Ponce Dawson5,6

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Cells use gene expression to identify environmental stimuli. Information theory reveals that transcription factor pulse frequency best distinguishes signals, especially with fast, high-threshold promoters, enabling selective cellular responses.

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Area of Science:

  • Cellular Biology
  • Systems Biology
  • Biophysics

Background:

  • Cells respond to environmental cues through gene expression changes.
  • Transcription factors (TFs) regulate gene expression by binding to DNA.
  • TF activity is often modulated by pulses in nuclear concentration.

Purpose of the Study:

  • To analyze how gene expression identifies extracellular stimuli and their intensity.
  • To investigate TF pulse encoding via amplitude, duration, or frequency.
  • To assess promoter parameter influence on information transmission.

Main Methods:

  • Utilized information theory and a simple transcription model.
  • Analyzed TF nuclear concentration pulses (activation state).
  • Examined encoding in pulse amplitude, duration, and frequency.

Main Results:

  • Identified three ranges of input strengths for all modulation modes.
  • Maximum information transmission observed for fast, high-activation threshold promoters.
  • Frequency modulation demonstrated highest sensitivity to promoter parameter changes, unlike duration or amplitude modulation.

Conclusions:

  • TF pulse frequency is a highly selective encoding mode for signal identification.
  • Specific promoter parameters allow for high information transmission in duration or amplitude modulation, but not frequency modulation.
  • Frequency modulation enables selective promoter activation, distinguishing it from other modes for signal identification without additional mediators.