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Related Concept Videos

Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Related Experiment Video

Updated: Feb 14, 2026

Epigenetic Regulation of Cardiac Differentiation of Embryonic Stem Cells and Tissues
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Structured Promoter Variability in Epigenetically Regulated Operons Contributes to Surface Adaptation in Salmonella.

Rocío Fernández-Fernández1, Gabriel Gutiérrez2, Francine Piubeli2

  • 1Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain.

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Summary
This summary is machine-generated.

Bacteria adapt to harsh environments by altering surface structures. This study reveals structured promoter variation in Salmonella

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Bacterial adaptation to environmental challenges is crucial for survival.
  • Surface structure modification is a key bacterial adaptation strategy.
  • Genetic mutations in coding sequences are known drivers of adaptation.

Purpose of the Study:

  • To investigate the evolutionary dynamics and regulatory architecture of the opvAB operon promoter region in Salmonella.
  • To identify novel mechanisms of bacterial adaptation beyond simple genetic mutations.
  • To explore the role of structured promoter variation in bacterial evolution.

Main Methods:

  • Comparative genomics of Salmonella subspecies to analyze regulatory region variability.
  • Experimental analysis of phase variation in clonal bacterial populations.
  • Investigating epigenetic regulation by Dam methylation and OxyR binding.

Main Results:

  • Striking variability was observed in the opvAB operon's regulatory region across Salmonella subspecies.
  • Mutations in the opvAB promoter clustered at specific, recurrent positions, indicating functional significance.
  • Phase variation analysis confirmed structured promoter variation at the single-cell level.

Conclusions:

  • Structured promoter variation represents a novel layer of functional adaptation in bacteria.
  • This mechanism complements genetic and epigenetic strategies for bacterial adaptation.
  • Understanding promoter variation offers new insights into bacterial evolution and environmental response.