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Related Concept Videos

The Eukaryotic Promoter Region02:40

The Eukaryotic Promoter Region

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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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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An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
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Complexities of human promoter sequences.

Fangcui Zhao1, Huijie Yang, Binghong Wang

  • 1College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100022, China.

Journal of Theoretical Biology
|May 8, 2007
PubMed
Summary

Human promoter sequences exhibit scale-invariance properties, analyzed using diffusion entropy. The scale-invariance exponent distribution shows asymmetry, with distinct Gaussian fits for its left and right branches.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Statistical Physics

Background:

  • Understanding the organizational principles of DNA sequences is crucial for deciphering gene regulation.
  • Human promoter sequences play a critical role in gene expression.
  • Scale-invariance has been observed in various biological systems, suggesting underlying organizational mechanisms.

Purpose of the Study:

  • To investigate the presence and characteristics of scale-invariance in human promoter sequences.
  • To quantify the scale-invariance exponent and analyze its distribution.
  • To explore the statistical properties of the scale-invariance exponent distribution.

Main Methods:

  • Diffusion entropy analysis was applied to a dataset of 4737 human promoter sequences.
  • The scale-invariance exponent was calculated for each sequence.
  • Statistical analysis was performed on the distribution of the scale-invariance exponents.

Main Results:

  • Scale-invariance characteristics were detected in human promoter sequences.
  • The scale-invariance exponent ranged from 0.3 to 0.9, centered at 0.66.
  • The distribution of the exponent was asymmetric, with distinct Gaussian fits for the left and right branches.

Conclusions:

  • Human promoter sequences possess inherent scale-invariance properties.
  • The asymmetric distribution of the scale-invariance exponent suggests complex underlying organizational principles.
  • Further research can explore the functional implications of these findings in gene regulation.