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The Eukaryotic Promoter Region02:40

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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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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.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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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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Eukaryotic Transcription Activators02:42

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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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Related Experiment Video

Updated: Oct 19, 2025

Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
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The Core Promoter Is a Regulatory Hub for Developmental Gene Expression.

Anna Sloutskin1, Hila Shir-Shapira1, Richard N Freiman2

  • 1The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat Gan, Israel.

Frontiers in Cell and Developmental Biology
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

The core promoter region, not just enhancers, actively regulates developmental genes. Its downstream elements, like the DPE, control gene regulatory networks essential for body plan formation.

Keywords:
Hox genesbasal transcription machinerycore promotercore promoter elements/motifsdevelopmentdorsal-ventral axismesoderm formationtranscriptional regulation

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Cellular uniqueness and multicellular development rely on distinct transcriptional programs.
  • The core promoter region, directing RNA polymerase II (Pol II) transcription, is an active regulatory module, not a passive DNA sequence.
  • Recent findings reveal promoter-dependent basal transcription machinery, crucial for embryonic development.

Purpose of the Study:

  • To review the regulatory role of the core promoter, especially its downstream region, in developmental gene expression.
  • To highlight the significance of the downstream core promoter element (DPE) in conserved gene regulatory networks (GRNs).
  • To emphasize the core promoter's role in driving embryonic development, differentiation, and morphogenesis.

Main Methods:

  • Mini-review of existing literature on core promoter function.
  • Analysis of studies implicating downstream core promoter elements in gene regulation.
  • Examination of the interplay between core promoters, enhancers, and transcription complexes.

Main Results:

  • Distinct core promoter compositions lead to varied transcriptional outputs.
  • The DPE is implicated in controlling GRNs for anterior-posterior and dorsal-ventral body axes.
  • Core promoter content influences transcription burst size and enhancer compatibility.

Conclusions:

  • The core promoter region is a critical regulatory hub for developmental genes, essential for metazoan embryonic development.
  • Specialized transcription complexes and their core promoter targets are key drivers of development, differentiation, and morphogenesis.
  • Core promoter composition is as important as enhancers in determining gene expression specificity during development.