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Related Concept Videos

Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

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Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
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What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
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What is Gene Expression?01:36

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Regulation of Expression Occurs at Multiple Steps02:24

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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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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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
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Related Experiment Video

Updated: Feb 9, 2026

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Temporal precision of regulated gene expression.

Shivam Gupta1, Julien Varennes1, Hendrik C Korswagen2

  • 1Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana, United States of America.

Plos Computational Biology
|June 8, 2018
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Summary
This summary is machine-generated.

Cells achieve precise timing in development using dynamic regulation, not just random chance. This strategy optimizes molecular processes despite inherent biological noise.

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Area of Science:

  • Cellular Biology
  • Developmental Biology
  • Systems Biology

Background:

  • Cellular processes like migration and differentiation require precise timing.
  • Molecular mechanisms regulating cellular timing are inherently noisy.
  • Understanding how cells achieve precise timing despite noise is a key question.

Purpose of the Study:

  • Investigate how cells achieve precise timing with noisy molecular components.
  • Analyze the effectiveness of different regulatory strategies (activation, repression, unregulated).
  • Identify optimal molecular strategies for precise cellular timing.

Main Methods:

  • Utilized a first-passage-time approach to model molecular events.
  • Examined scenarios with accumulating activators and diminishing repressors.
  • Analyzed the trade-offs between regulator noise and target molecule noise.

Main Results:

  • Both activation and repression strategies outperform unregulated processes.
  • Optimal regulation involves a nonlinear increase in target molecule abundance over time.
  • This nonlinear dynamic regulation is robust to factors like gene bursts and cell division.

Conclusions:

  • Dynamic regulation, specifically nonlinear increases in molecular abundance, is a powerful strategy for precise cellular timing.
  • Findings are supported by quantitative agreement with mig-1 gene expression in Caenorhabditis elegans neuroblasts.
  • This suggests a simple yet effective mechanism for achieving temporal precision in biological systems.