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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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Promoter-Autonomous Functioning in a Controlled Environment using Single Molecule FISH.

Sami Hocine1, Maria Vera1, Daniel Zenklusen2

  • 1Department of Anatomy and Structural Biology, Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, New York, USA.

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|May 29, 2015
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Summary
This summary is machine-generated.

This study introduces a novel single-cell method to measure yeast promoter activity. Results show promoters independently control their transcriptional profiles, unaffected by genomic context, gene length, or sequence.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • Transcription is a fundamental biological process regulated by complex assembly at promoter regions.
  • Existing research has not fully clarified how genomic context influences promoter transcriptional profiles.
  • A single-cell method for direct comparison of transcriptional profiles, independent of gene length and sequence, is lacking.

Purpose of the Study:

  • To develop and utilize a single-cell method for directly comparing transcriptional kinetics of yeast promoters.
  • To investigate whether promoters autonomously encode their transcriptional profiles.
  • To determine the influence of genomic locus, gene length, and gene sequence on promoter activity.

Main Methods:

  • Employed a single genetic site in yeast to isolate and study promoter transcriptional kinetics.
  • Utilized single-molecule fluorescence in situ hybridization (smFISH) for direct measurement of transcriptional activity.
  • Analyzed synthesis and cell-to-cell variability in transcription.

Main Results:

  • Demonstrated that promoters autonomously encode their transcriptional profiles.
  • Showed that transcriptional activity is independent of genomic locus.
  • Confirmed that gene length and gene sequence do not affect the inherent transcriptional profile of a promoter.

Conclusions:

  • Promoters possess intrinsic properties that dictate their transcriptional output.
  • The genomic environment does not significantly alter a promoter's inherent regulatory capacity.
  • This single-cell approach provides a powerful tool for dissecting promoter function.