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Related Concept Videos

Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Constitutive and Regulated Gene Expression01:27

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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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Repressible Operon: trp Operon01:21

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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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Reporter Genes02:11

Reporter Genes

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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Related Experiment Video

Updated: Feb 18, 2026

Rapid Characterization of Genetic Parts with Cell-Free Systems
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Parts Characterization for Tunable Protein Expression.

Michael S Klausen1, Morten O A Sommer2

  • 1The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kemitorvet Building 220, Kgs Lyngby, 2800, Denmark.

Methods in Molecular Biology (Clifton, N.J.)
|November 25, 2017
PubMed
Summary
This summary is machine-generated.

Flow-seq is a new method that links genome engineering with cell sorting and DNA sequencing to understand how genes influence traits. This technique can reveal how DNA changes affect protein production, like modifying the Shine-Dalgarno sequence in E. coli.

Keywords:
Flow cytometry cell sortingFlow-seqNext-generation sequencingShine-Dalgarno sequence

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Understanding genotype-phenotype relationships is crucial in molecular biology.
  • Assessing the impact of specific DNA sequences on gene expression requires advanced methodologies.

Purpose of the Study:

  • To introduce and demonstrate Flow-seq, a novel method for comprehensive genotype-phenotype analysis.
  • To investigate the quantitative effects of regulatory DNA elements on protein expression levels.

Main Methods:

  • Flow-seq integrates flexible genome engineering with flow cytometry and deep DNA sequencing.
  • Targeted genomic variations were constructed around fluorescent marker genes.
  • Deep sequencing analyzed the DNA variants present in sorted cell populations.

Main Results:

  • Flow-seq enables the rapid elucidation of sequence variant contributions to protein expression.
  • The method was successfully applied to characterize modifications in the Shine-Dalgarno sequence of E. coli.
  • Quantitative genotype-phenotype correlations were established.

Conclusions:

  • Flow-seq provides a powerful platform for dissecting genotype-phenotype relationships.
  • This approach accelerates the characterization of regulatory elements and their impact on gene expression.
  • Flow-seq is applicable to diverse biological systems for genetic analysis.